|
Octane Overkill
Hello,
Not being an engine expert, I figured I'd throw this question out to this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard that doing so will keep your injectors clean. (Is that true?) Once I really splurged and put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One thing I noticed, is that if I run premium (93) in it several tanks in a row, it will actually not run quite as good. It's a very minuscule difference, but I can tell there is a slight decrease in performance. If I drop it back down to mid-grade or even back to regular on the next tank, it seems to go back to running better. Is this all in my head, or is it possible to have an "octane overkill" on such a small 4-cylinder engine? Thanx in advance, Jonathan |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? The vehicle was designed to run on regular fuel. Using any other grade is just throwing your money away. Brian |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? The vehicle was designed to run on regular fuel. Using any other grade is just throwing your money away. Brian |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message
news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > that doing so will keep your injectors clean. (Is that true?) Once I > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > run pretty good. One thing I noticed, is that if I run premium (93) in it > several tanks in a row, it will actually not run quite as good. It's a > very minuscule difference, but I can tell there is a slight decrease in > performance. If I drop it back down to mid-grade or even back to regular > on the next tank, it seems to go back to running better. Is this all in > my head, or is it possible to have an "octane overkill" on such a small > 4-cylinder engine? > > Thanx in advance, > > Jonathan > High octane fuel is for high compression engines, to prevent detonation (ping). Your owner's manual will tell you what grade to use - probably 87 octane. Rather than going to a premium grade (which, it's true, often has higher detergency), stick with the recommended octane. Some brands have more detergents than others, and they advertise that. (I like Shell/Texaco and Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start to feel grabby - if I ran 76 in it for a couple months but would straighten right out about halfway through a tank of Texaco. My other cars never seem to care. We also have a Toyota Prius, and on the Prius newsgroup others have warned me it won't run right and will even set the "check engine" light if premium grades are used. (The Prius has what Toyota calls a "modified Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 expansion ratio to a variable compression ratio.) Mike |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message
news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > that doing so will keep your injectors clean. (Is that true?) Once I > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > run pretty good. One thing I noticed, is that if I run premium (93) in it > several tanks in a row, it will actually not run quite as good. It's a > very minuscule difference, but I can tell there is a slight decrease in > performance. If I drop it back down to mid-grade or even back to regular > on the next tank, it seems to go back to running better. Is this all in > my head, or is it possible to have an "octane overkill" on such a small > 4-cylinder engine? > > Thanx in advance, > > Jonathan > High octane fuel is for high compression engines, to prevent detonation (ping). Your owner's manual will tell you what grade to use - probably 87 octane. Rather than going to a premium grade (which, it's true, often has higher detergency), stick with the recommended octane. Some brands have more detergents than others, and they advertise that. (I like Shell/Texaco and Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start to feel grabby - if I ran 76 in it for a couple months but would straighten right out about halfway through a tank of Texaco. My other cars never seem to care. We also have a Toyota Prius, and on the Prius newsgroup others have warned me it won't run right and will even set the "check engine" light if premium grades are used. (The Prius has what Toyota calls a "modified Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 expansion ratio to a variable compression ratio.) Mike |
Re: Octane Overkill
In article <D6cqd.7794$Mu3.802926@twister.southeast.rr.com> ,
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote: > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Prior to 1995, it may have been truer than not. The oil companies used to put detergents into only their higher octane fuels, as an incentive to get you to pay the price. Around 1995, though, the feds defined a minimum level of detergency to be put into ALL fuels. This dried up the oil companies' ability to claim that "buy our expensive stuff, and your car will be cleaner and run better". Shell is back into that game now, though, with their V-Power. They simply add MORE detergents to their 92 octane gas than is specified by law. This all being said, you can add a can of Chevron Techron to your fuel every now and then and get the same results or better. And it's MUCH cheaper than using Shell V-Power on an ongoing basis. > Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. Not as good as you think. You wasted your money, AND you wasted fuel on top of that. > One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. That's right. The higher octane fuel won't give your engine as much power as the lower octane fuel, believe it or not. http://www.faqs.org/faqs/autos/gasoline-faq/part1/ |
Re: Octane Overkill
In article <D6cqd.7794$Mu3.802926@twister.southeast.rr.com> ,
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote: > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Prior to 1995, it may have been truer than not. The oil companies used to put detergents into only their higher octane fuels, as an incentive to get you to pay the price. Around 1995, though, the feds defined a minimum level of detergency to be put into ALL fuels. This dried up the oil companies' ability to claim that "buy our expensive stuff, and your car will be cleaner and run better". Shell is back into that game now, though, with their V-Power. They simply add MORE detergents to their 92 octane gas than is specified by law. This all being said, you can add a can of Chevron Techron to your fuel every now and then and get the same results or better. And it's MUCH cheaper than using Shell V-Power on an ongoing basis. > Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. Not as good as you think. You wasted your money, AND you wasted fuel on top of that. > One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. That's right. The higher octane fuel won't give your engine as much power as the lower octane fuel, believe it or not. http://www.faqs.org/faqs/autos/gasoline-faq/part1/ |
Re: Octane Overkill
On Sun, 28 Nov 2004 04:03:47 GMT, "K-town"
<jdu52580@carolina.stopspam.rr.com> wrote: >Hello, > > Not being an engine expert, I figured I'd throw this question out to >this NG. What makes you think we are experts? We just have computers and internet connections. > I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put >regular unleaded (87 octane) in it. It is my understanding that using a higher octane than is called for in the owner's manual is a waste of money. Modern engines are designed to adjust the spark advance so as to avoid the "octane ping" that was common with older engines. On the other hand, it is true that some manufacturers claim the higher octane gasoline ("premium grades") contains additives that may help clean your injectors. You have to treat these claims the way you treat all marketing claims. Elliot Richmond Freelance Science Writer and Editor |
Re: Octane Overkill
On Sun, 28 Nov 2004 04:03:47 GMT, "K-town"
<jdu52580@carolina.stopspam.rr.com> wrote: >Hello, > > Not being an engine expert, I figured I'd throw this question out to >this NG. What makes you think we are experts? We just have computers and internet connections. > I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put >regular unleaded (87 octane) in it. It is my understanding that using a higher octane than is called for in the owner's manual is a waste of money. Modern engines are designed to adjust the spark advance so as to avoid the "octane ping" that was common with older engines. On the other hand, it is true that some manufacturers claim the higher octane gasoline ("premium grades") contains additives that may help clean your injectors. You have to treat these claims the way you treat all marketing claims. Elliot Richmond Freelance Science Writer and Editor |
Re: Octane Overkill
K-town wrote: > > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? > > Thanx in advance, > > Jonathan Waste of money. All modern gasolines regardless of grade have additives to prevent injector problems... -- JT Just tooling through cyberspace in my ancient G4 |
Re: Octane Overkill
K-town wrote: > > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? > > Thanx in advance, > > Jonathan Waste of money. All modern gasolines regardless of grade have additives to prevent injector problems... -- JT Just tooling through cyberspace in my ancient G4 |
Re: Octane Overkill
K-town wrote:
> Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? > > Thanx in advance, > > Jonathan increasing octane effectively = slower flame front propagation speed. that reduces detonation in combustion chambers with poor flow/mixing configurations, sharp angles & extended reach. good mechanical design addresses these problems pretty much completely, therefore low octane can be used without detonation and with ignition timing matched accordingly. using a high octane fuel in a low octane timed engine puts too much of the combustion energy out of the exhaust because it's still burning on the down stroke, not expanding and providing push for the pistons. that said, you may notice a slight increase in power for a mid grade fuel in that motor without a detonation sensor. partly because, in the absense of a sensor, the engine timing used has to be a "compromise" range designed to be safe and partly because of fuel chemistry. here's an interesting post that touches on the subject: http://www.digest.net/bmw/archive/v9/msg04942.html it seems to assume that ignition timing is optimal for each different combustion characteristic of the different blends described. you can be assured that gas companies use all the cheap options for their lowest grade of gas. |
Re: Octane Overkill
K-town wrote:
> Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? > > Thanx in advance, > > Jonathan increasing octane effectively = slower flame front propagation speed. that reduces detonation in combustion chambers with poor flow/mixing configurations, sharp angles & extended reach. good mechanical design addresses these problems pretty much completely, therefore low octane can be used without detonation and with ignition timing matched accordingly. using a high octane fuel in a low octane timed engine puts too much of the combustion energy out of the exhaust because it's still burning on the down stroke, not expanding and providing push for the pistons. that said, you may notice a slight increase in power for a mid grade fuel in that motor without a detonation sensor. partly because, in the absense of a sensor, the engine timing used has to be a "compromise" range designed to be safe and partly because of fuel chemistry. here's an interesting post that touches on the subject: http://www.digest.net/bmw/archive/v9/msg04942.html it seems to assume that ignition timing is optimal for each different combustion characteristic of the different blends described. you can be assured that gas companies use all the cheap options for their lowest grade of gas. |
Re: Octane Overkill
ive been using amoco ultimate in my 04 accord should i switch to regular??
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > that doing so will keep your injectors clean. (Is that true?) Once I > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > run pretty good. One thing I noticed, is that if I run premium (93) in it > several tanks in a row, it will actually not run quite as good. It's a > very minuscule difference, but I can tell there is a slight decrease in > performance. If I drop it back down to mid-grade or even back to regular > on the next tank, it seems to go back to running better. Is this all in > my head, or is it possible to have an "octane overkill" on such a small > 4-cylinder engine? > > Thanx in advance, > > Jonathan > |
Re: Octane Overkill
ive been using amoco ultimate in my 04 accord should i switch to regular??
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > that doing so will keep your injectors clean. (Is that true?) Once I > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > run pretty good. One thing I noticed, is that if I run premium (93) in it > several tanks in a row, it will actually not run quite as good. It's a > very minuscule difference, but I can tell there is a slight decrease in > performance. If I drop it back down to mid-grade or even back to regular > on the next tank, it seems to go back to running better. Is this all in > my head, or is it possible to have an "octane overkill" on such a small > 4-cylinder engine? > > Thanx in advance, > > Jonathan > |
Re: Octane Overkill
In article <c_ydnWVcmJFbKDfcRVn-vw@comcast.com>,
"Edward Quinn" <edward-quinn@comcast.net> wrote: > ive been using amoco ultimate in my 04 accord should i switch to regular?? Use the fuel that your owner's manual recommends. In your case, 86 octane fuel is fine. Anything else, you're wasting your money. |
Re: Octane Overkill
In article <c_ydnWVcmJFbKDfcRVn-vw@comcast.com>,
"Edward Quinn" <edward-quinn@comcast.net> wrote: > ive been using amoco ultimate in my 04 accord should i switch to regular?? Use the fuel that your owner's manual recommends. In your case, 86 octane fuel is fine. Anything else, you're wasting your money. |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:<D6cqd.7794$Mu3.802926@twister.southeast.rr.c om>...
> Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? Unless your engine is knocking, there is no need to spend the extra money for a higher octane fuel. Use what the owner's manual recommends. I suggest reading: http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm "The Low-Down on High Octane Gasoline" |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:<D6cqd.7794$Mu3.802926@twister.southeast.rr.c om>...
> Hello, > > Not being an engine expert, I figured I'd throw this question out to > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > regular unleaded (87 octane) in it. Every once in awhile I'll put mid-grade > (89 octane) or premium (92 or 93 octane) in it because I heard that doing so > will keep your injectors clean. (Is that true?) Once I really splurged and > put 100 octane fuel in it (only 5 gallons) and it did run pretty good. One > thing I noticed, is that if I run premium (93) in it several tanks in a row, > it will actually not run quite as good. It's a very minuscule difference, > but I can tell there is a slight decrease in performance. If I drop it back > down to mid-grade or even back to regular on the next tank, it seems to go > back to running better. Is this all in my head, or is it possible to have > an "octane overkill" on such a small 4-cylinder engine? Unless your engine is knocking, there is no need to spend the extra money for a higher octane fuel. Use what the owner's manual recommends. I suggest reading: http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm "The Low-Down on High Octane Gasoline" |
Re: Octane Overkill
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>...
> "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > > Hello, > > > > Not being an engine expert, I figured I'd throw this question out to > > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > > regular unleaded (87 octane) in it. Every once in awhile I'll put > > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > > that doing so will keep your injectors clean. (Is that true?) Once I > > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > > run pretty good. One thing I noticed, is that if I run premium (93) in it > > several tanks in a row, it will actually not run quite as good. It's a > > very minuscule difference, but I can tell there is a slight decrease in > > performance. If I drop it back down to mid-grade or even back to regular > > on the next tank, it seems to go back to running better. Is this all in > > my head, or is it possible to have an "octane overkill" on such a small > > 4-cylinder engine? > > > > Thanx in advance, > > > > Jonathan > > > High octane fuel is for high compression engines, to prevent detonation > (ping). Your owner's manual will tell you what grade to use - probably 87 > octane. Rather than going to a premium grade (which, it's true, often has > higher detergency), stick with the recommended octane. Some brands have more > detergents than others, and they advertise that. (I like Shell/Texaco and > Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start > to feel grabby - if I ran 76 in it for a couple months but would straighten > right out about halfway through a tank of Texaco. My other cars never seem > to care. > > We also have a Toyota Prius, and on the Prius newsgroup others have warned > me it won't run right and will even set the "check engine" light if premium > grades are used. (The Prius has what Toyota calls a "modified > Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 > expansion ratio to a variable compression ratio.) > > Mike Hey Mike I thought you might be interested in some test that were run with high octane E85 in a prius. Check out page 10 at http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase in power when the "Forbidden" fuel was tested. I have made a bunch of post at The Temple of VTEC about this subject. I post as cleverlever. You also might be interested in my patent 4,961,406 which demonstates how to change the burn rate of a given fuel at low rpm |
Re: Octane Overkill
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>...
> "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > > Hello, > > > > Not being an engine expert, I figured I'd throw this question out to > > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > > regular unleaded (87 octane) in it. Every once in awhile I'll put > > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > > that doing so will keep your injectors clean. (Is that true?) Once I > > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > > run pretty good. One thing I noticed, is that if I run premium (93) in it > > several tanks in a row, it will actually not run quite as good. It's a > > very minuscule difference, but I can tell there is a slight decrease in > > performance. If I drop it back down to mid-grade or even back to regular > > on the next tank, it seems to go back to running better. Is this all in > > my head, or is it possible to have an "octane overkill" on such a small > > 4-cylinder engine? > > > > Thanx in advance, > > > > Jonathan > > > High octane fuel is for high compression engines, to prevent detonation > (ping). Your owner's manual will tell you what grade to use - probably 87 > octane. Rather than going to a premium grade (which, it's true, often has > higher detergency), stick with the recommended octane. Some brands have more > detergents than others, and they advertise that. (I like Shell/Texaco and > Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start > to feel grabby - if I ran 76 in it for a couple months but would straighten > right out about halfway through a tank of Texaco. My other cars never seem > to care. > > We also have a Toyota Prius, and on the Prius newsgroup others have warned > me it won't run right and will even set the "check engine" light if premium > grades are used. (The Prius has what Toyota calls a "modified > Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 > expansion ratio to a variable compression ratio.) > > Mike Hey Mike I thought you might be interested in some test that were run with high octane E85 in a prius. Check out page 10 at http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase in power when the "Forbidden" fuel was tested. I have made a bunch of post at The Temple of VTEC about this subject. I post as cleverlever. You also might be interested in my patent 4,961,406 which demonstates how to change the burn rate of a given fuel at low rpm |
Re: Octane Overkill
Edward Quinn wrote:
> ive been using amoco ultimate in my 04 accord should i switch to > regular?? Only if you want to save money. I once did a study when I was commuting 100 miles each way to work in the mid 90's (late 80's GM Bonneville 6 cyl). I clocked my mileage and input gallons closely for a month using 87 octane gas and another month using 91 octane. Both months were during summer, and no AC was used. My mileage per tank was about 8% higher on average with the 91 octane. Of course, the 91 octane was 10% higher cost. > > "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... >> Hello, >> >> Not being an engine expert, I figured I'd throw this question out >> to this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually >> I put regular unleaded (87 octane) in it. Every once in awhile I'll >> put mid-grade (89 octane) or premium (92 or 93 octane) in it because >> I heard that doing so will keep your injectors clean. (Is that >> true?) Once I really splurged and put 100 octane fuel in it (only 5 >> gallons) and it did run pretty good. One thing I noticed, is that >> if I run premium (93) in it several tanks in a row, it will actually >> not run quite as good. It's a very minuscule difference, but I can >> tell there is a slight decrease in performance. If I drop it back >> down to mid-grade or even back to regular on the next tank, it seems >> to go back to running better. Is this all in my head, or is it >> possible to have an "octane overkill" on such a small 4-cylinder >> engine? Thanx in advance, >> >> Jonathan |
Re: Octane Overkill
Edward Quinn wrote:
> ive been using amoco ultimate in my 04 accord should i switch to > regular?? Only if you want to save money. I once did a study when I was commuting 100 miles each way to work in the mid 90's (late 80's GM Bonneville 6 cyl). I clocked my mileage and input gallons closely for a month using 87 octane gas and another month using 91 octane. Both months were during summer, and no AC was used. My mileage per tank was about 8% higher on average with the 91 octane. Of course, the 91 octane was 10% higher cost. > > "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... >> Hello, >> >> Not being an engine expert, I figured I'd throw this question out >> to this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually >> I put regular unleaded (87 octane) in it. Every once in awhile I'll >> put mid-grade (89 octane) or premium (92 or 93 octane) in it because >> I heard that doing so will keep your injectors clean. (Is that >> true?) Once I really splurged and put 100 octane fuel in it (only 5 >> gallons) and it did run pretty good. One thing I noticed, is that >> if I run premium (93) in it several tanks in a row, it will actually >> not run quite as good. It's a very minuscule difference, but I can >> tell there is a slight decrease in performance. If I drop it back >> down to mid-grade or even back to regular on the next tank, it seems >> to go back to running better. Is this all in my head, or is it >> possible to have an "octane overkill" on such a small 4-cylinder >> engine? Thanx in advance, >> >> Jonathan |
Re: Octane Overkill
cleverlever99@hotmail.com (Cleverlever) wrote in message news:<3fffe09a.0411291847.134f3f5d@posting.google. com>...
> "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>... > > "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > > > Hello, > > > > > > Not being an engine expert, I figured I'd throw this question out to > > > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > > > regular unleaded (87 octane) in it. Every once in awhile I'll put > > > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > > > that doing so will keep your injectors clean. (Is that true?) Once I > > > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > > > run pretty good. One thing I noticed, is that if I run premium (93) in it > > > several tanks in a row, it will actually not run quite as good. It's a > > > very minuscule difference, but I can tell there is a slight decrease in > > > performance. If I drop it back down to mid-grade or even back to regular > > > on the next tank, it seems to go back to running better. Is this all in > > > my head, or is it possible to have an "octane overkill" on such a small > > > 4-cylinder engine? > > > > > > Thanx in advance, > > > > > > Jonathan > > > > > High octane fuel is for high compression engines, to prevent detonation > > (ping). Your owner's manual will tell you what grade to use - probably 87 > > octane. Rather than going to a premium grade (which, it's true, often has > > higher detergency), stick with the recommended octane. Some brands have more > > detergents than others, and they advertise that. (I like Shell/Texaco and > > Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start > > to feel grabby - if I ran 76 in it for a couple months but would straighten > > right out about halfway through a tank of Texaco. My other cars never seem > > to care. > > > > We also have a Toyota Prius, and on the Prius newsgroup others have warned > > me it won't run right and will even set the "check engine" light if premium > > grades are used. (The Prius has what Toyota calls a "modified > > Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 > > expansion ratio to a variable compression ratio.) > > > > Mike > > Hey Mike > I thought you might be interested in some test that were run with high > octane E85 in a prius. Check out page 10 at > http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase > in power when the "Forbidden" fuel was tested. > I have made a bunch of post at The Temple of VTEC about this subject. > I post as cleverlever. You also might be interested in my patent > 4,961,406 which demonstates how to change the burn rate of a given > fuel at low rpm Yes, they also got a check engine light. Cold start emissions were higher, and overall MPG was lower. They did not perform any long-term tests (ethanol can break down parts of the car over time). The Prius is only rated to use E10. |
Re: Octane Overkill
cleverlever99@hotmail.com (Cleverlever) wrote in message news:<3fffe09a.0411291847.134f3f5d@posting.google. com>...
> "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>... > > "K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message > > news:D6cqd.7794$Mu3.802926@twister.southeast.rr.co m... > > > Hello, > > > > > > Not being an engine expert, I figured I'd throw this question out to > > > this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put > > > regular unleaded (87 octane) in it. Every once in awhile I'll put > > > mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard > > > that doing so will keep your injectors clean. (Is that true?) Once I > > > really splurged and put 100 octane fuel in it (only 5 gallons) and it did > > > run pretty good. One thing I noticed, is that if I run premium (93) in it > > > several tanks in a row, it will actually not run quite as good. It's a > > > very minuscule difference, but I can tell there is a slight decrease in > > > performance. If I drop it back down to mid-grade or even back to regular > > > on the next tank, it seems to go back to running better. Is this all in > > > my head, or is it possible to have an "octane overkill" on such a small > > > 4-cylinder engine? > > > > > > Thanx in advance, > > > > > > Jonathan > > > > > High octane fuel is for high compression engines, to prevent detonation > > (ping). Your owner's manual will tell you what grade to use - probably 87 > > octane. Rather than going to a premium grade (which, it's true, often has > > higher detergency), stick with the recommended octane. Some brands have more > > detergents than others, and they advertise that. (I like Shell/Texaco and > > Chevron.) I had a Nissan 300ZX that would get balky - the clutch would start > > to feel grabby - if I ran 76 in it for a couple months but would straighten > > right out about halfway through a tank of Texaco. My other cars never seem > > to care. > > > > We also have a Toyota Prius, and on the Prius newsgroup others have warned > > me it won't run right and will even set the "check engine" light if premium > > grades are used. (The Prius has what Toyota calls a "modified > > Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 > > expansion ratio to a variable compression ratio.) > > > > Mike > > Hey Mike > I thought you might be interested in some test that were run with high > octane E85 in a prius. Check out page 10 at > http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase > in power when the "Forbidden" fuel was tested. > I have made a bunch of post at The Temple of VTEC about this subject. > I post as cleverlever. You also might be interested in my patent > 4,961,406 which demonstates how to change the burn rate of a given > fuel at low rpm Yes, they also got a check engine light. Cold start emissions were higher, and overall MPG was lower. They did not perform any long-term tests (ethanol can break down parts of the car over time). The Prius is only rated to use E10. |
Re: Octane Overkill
this is great! an expert named
"jim beam" bought a computer and figured out how to wire it up. once he read something on the internet and provided the following nugget of BS for us to enjoy. wrote in message > increasing octane effectively = slower flame front propagation speed. no. close though. the rate or speed of flame is the same regardless of octane. increasing the octane does decrease breakdown components that tend to ignite behind the flame front. *dont take my word for it, buy a real book wioth real facts from real research, not something some dude with a BMW once posted on the net.* > that reduces detonation in combustion chambers with poor flow/mixing > configurations, sharp angles & extended reach. good mechanical design > addresses these problems pretty much completely, therefore low octane > can be used without detonation and with ignition timing matched > accordingly. you are a bit confused. the design of the combustion chamber is indeed important, but ignition timing and compression are the primary components of spark induced ping. combustion chamber design is a very narrow area of concern and for all intents, it does not mean much of anything when speaking of octane. not anymore > using a high octane fuel in a low octane timed engine puts > too much of the combustion energy out of the exhaust because it's still > burning on the down stroke, not expanding and providing push for the > pistons. really? using an octane over your requirements does not waste fuel. it does not decrease efficiancy or power or anything. it will just cost you more. > that said, you may notice a slight increase in power for a mid grade > fuel in that motor without a detonation sensor. partly because, in the > absense of a sensor, the engine timing used has to be a "compromise" > range designed to be safe and partly because of fuel chemistry. once an engine has had its octane requirements met, nothing, absolutely nothing, will change as a result of the octane you are using. ie; if your well tuned engine requires 87 RON MON, then it is the same as using 92 or 94 or 100. by definition, octane only has an effect on knock. > here's an interesting post that touches on the subject: > http://www.digest.net/bmw/archive/v9/msg04942.html it must be true! > it seems to assume that ignition timing is optimal for each different > combustion characteristic of the different blends described. you can be > assured that gas companies use all the cheap options for their lowest > grade of gas. what are you trying to say? the "lowest grade" as it applies to octane is not a qwuality judgement. there si not anything cheap or inferior about 87 vs. 92 octane gas. just its anti knock capabilities. for the record, major petroleum companies use the same additive package across the board. i suggest that you do some resarch of your own. i am informed becuase i am a consultant for petro comapnies and get paid to read about gasoline. i dont know much about cnacer, but then im not posting crap at the oncology NG! |
Re: Octane Overkill
this is great! an expert named
"jim beam" bought a computer and figured out how to wire it up. once he read something on the internet and provided the following nugget of BS for us to enjoy. wrote in message > increasing octane effectively = slower flame front propagation speed. no. close though. the rate or speed of flame is the same regardless of octane. increasing the octane does decrease breakdown components that tend to ignite behind the flame front. *dont take my word for it, buy a real book wioth real facts from real research, not something some dude with a BMW once posted on the net.* > that reduces detonation in combustion chambers with poor flow/mixing > configurations, sharp angles & extended reach. good mechanical design > addresses these problems pretty much completely, therefore low octane > can be used without detonation and with ignition timing matched > accordingly. you are a bit confused. the design of the combustion chamber is indeed important, but ignition timing and compression are the primary components of spark induced ping. combustion chamber design is a very narrow area of concern and for all intents, it does not mean much of anything when speaking of octane. not anymore > using a high octane fuel in a low octane timed engine puts > too much of the combustion energy out of the exhaust because it's still > burning on the down stroke, not expanding and providing push for the > pistons. really? using an octane over your requirements does not waste fuel. it does not decrease efficiancy or power or anything. it will just cost you more. > that said, you may notice a slight increase in power for a mid grade > fuel in that motor without a detonation sensor. partly because, in the > absense of a sensor, the engine timing used has to be a "compromise" > range designed to be safe and partly because of fuel chemistry. once an engine has had its octane requirements met, nothing, absolutely nothing, will change as a result of the octane you are using. ie; if your well tuned engine requires 87 RON MON, then it is the same as using 92 or 94 or 100. by definition, octane only has an effect on knock. > here's an interesting post that touches on the subject: > http://www.digest.net/bmw/archive/v9/msg04942.html it must be true! > it seems to assume that ignition timing is optimal for each different > combustion characteristic of the different blends described. you can be > assured that gas companies use all the cheap options for their lowest > grade of gas. what are you trying to say? the "lowest grade" as it applies to octane is not a qwuality judgement. there si not anything cheap or inferior about 87 vs. 92 octane gas. just its anti knock capabilities. for the record, major petroleum companies use the same additive package across the board. i suggest that you do some resarch of your own. i am informed becuase i am a consultant for petro comapnies and get paid to read about gasoline. i dont know much about cnacer, but then im not posting crap at the oncology NG! |
Re: Octane Overkill
being tired and cranky,
just do a deja news search with "Joe Lang" and octane. "Joe Lang" <wjablonski@trcsolutions.comREMove> wrote in message news:1101848317.Jz0aCVvlooIblociTKf9mA@teranews... > this is great! an expert named > "jim beam" bought a computer and figured out how to wire it up. once he > read something on the internet and provided the following nugget of BS for > us to enjoy. > > |
Re: Octane Overkill
being tired and cranky,
just do a deja news search with "Joe Lang" and octane. "Joe Lang" <wjablonski@trcsolutions.comREMove> wrote in message news:1101848317.Jz0aCVvlooIblociTKf9mA@teranews... > this is great! an expert named > "jim beam" bought a computer and figured out how to wire it up. once he > read something on the internet and provided the following nugget of BS for > us to enjoy. > > |
Re: Octane Overkill
In article <1101848317.Jz0aCVvlooIblociTKf9mA@teranews>,
"Joe Lang" <wjablonski@trcsolutions.comREMove> wrote: > using an octane over your requirements does not waste fuel. it > does not decrease efficiancy or power or anything. um, yes, it's less efficient. |
Re: Octane Overkill
In article <1101848317.Jz0aCVvlooIblociTKf9mA@teranews>,
"Joe Lang" <wjablonski@trcsolutions.comREMove> wrote: > using an octane over your requirements does not waste fuel. it > does not decrease efficiancy or power or anything. um, yes, it's less efficient. |
Re: Octane Overkill
"Cleverlever" <cleverlever99@hotmail.com> wrote in message
news:3fffe09a.0411291847.134f3f5d@posting.google.c om... > "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message > news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>... >> High octane fuel is for high compression engines, to prevent detonation >> (ping). Your owner's manual will tell you what grade to use - probably 87 >> octane. Rather than going to a premium grade (which, it's true, often has >> higher detergency), stick with the recommended octane. Some brands have >> more >> detergents than others, and they advertise that. (I like Shell/Texaco and >> Chevron.) I had a Nissan 300ZX that would get balky - the clutch would >> start >> to feel grabby - if I ran 76 in it for a couple months but would >> straighten >> right out about halfway through a tank of Texaco. My other cars never >> seem >> to care. >> >> We also have a Toyota Prius, and on the Prius newsgroup others have >> warned >> me it won't run right and will even set the "check engine" light if >> premium >> grades are used. (The Prius has what Toyota calls a "modified >> Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 >> expansion ratio to a variable compression ratio.) >> >> Mike > > Hey Mike > I thought you might be interested in some test that were run with high > octane E85 in a prius. Check out page 10 at > http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase > in power when the "Forbidden" fuel was tested. > I have made a bunch of post at The Temple of VTEC about this subject. > I post as cleverlever. You also might be interested in my patent > 4,961,406 which demonstates how to change the burn rate of a given > fuel at low rpm An interesting link. Thanks! My understanding is that octane is not specifically about burn rate, but about ignition point. If the mixture ignites because of the heat of compression, or if the compression heating is high enough that the reaction propagates by the pressure front instead of the flame front, the fuel mixture changes from a low explosive to a high explosive. See http://www.howstuffworks.com/question90.htm Mike |
Re: Octane Overkill
"Cleverlever" <cleverlever99@hotmail.com> wrote in message
news:3fffe09a.0411291847.134f3f5d@posting.google.c om... > "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message > news:<DNKdnZm-a6KEUzTcRVn-pA@sedona.net>... >> High octane fuel is for high compression engines, to prevent detonation >> (ping). Your owner's manual will tell you what grade to use - probably 87 >> octane. Rather than going to a premium grade (which, it's true, often has >> higher detergency), stick with the recommended octane. Some brands have >> more >> detergents than others, and they advertise that. (I like Shell/Texaco and >> Chevron.) I had a Nissan 300ZX that would get balky - the clutch would >> start >> to feel grabby - if I ran 76 in it for a couple months but would >> straighten >> right out about halfway through a tank of Texaco. My other cars never >> seem >> to care. >> >> We also have a Toyota Prius, and on the Prius newsgroup others have >> warned >> me it won't run right and will even set the "check engine" light if >> premium >> grades are used. (The Prius has what Toyota calls a "modified >> Atkinson/Miller cycle" engine - it uses valve timing to tame the 13:1 >> expansion ratio to a variable compression ratio.) >> >> Mike > > Hey Mike > I thought you might be interested in some test that were run with high > octane E85 in a prius. Check out page 10 at > http://www.creedproject.org/stream_v7n2.pdf and observe a 20% increase > in power when the "Forbidden" fuel was tested. > I have made a bunch of post at The Temple of VTEC about this subject. > I post as cleverlever. You also might be interested in my patent > 4,961,406 which demonstates how to change the burn rate of a given > fuel at low rpm An interesting link. Thanks! My understanding is that octane is not specifically about burn rate, but about ignition point. If the mixture ignites because of the heat of compression, or if the compression heating is high enough that the reaction propagates by the pressure front instead of the flame front, the fuel mixture changes from a low explosive to a high explosive. See http://www.howstuffworks.com/question90.htm Mike |
Re: Octane Overkill
Joe Lang wrote:
> being tired and cranky, > just do a deja news search with "Joe Lang" and octane. > > "Joe Lang" <wjablonski@trcsolutions.comREMove> wrote in message > news:1101848317.Jz0aCVvlooIblociTKf9mA@teranews... > >>this is great! an expert named >>"jim beam" bought a computer and figured out how to wire it up. once he >>read something on the internet and provided the following nugget of BS for >>us to enjoy. >> tell me more about combustion chamber design. as i understand it, morphology influces gas flow, density, turbulence and pressure wave propagation. this in turn does affect the stability of the resulting cylinder charge on compression, hence octane matters. i'm /not/ an expert on this stuff joe, but i do have some books on the subject, so please, enlighten me further. and please, let's keep the flame limited to the spark-induced variety. |
Re: Octane Overkill
Joe Lang wrote:
> being tired and cranky, > just do a deja news search with "Joe Lang" and octane. > > "Joe Lang" <wjablonski@trcsolutions.comREMove> wrote in message > news:1101848317.Jz0aCVvlooIblociTKf9mA@teranews... > >>this is great! an expert named >>"jim beam" bought a computer and figured out how to wire it up. once he >>read something on the internet and provided the following nugget of BS for >>us to enjoy. >> tell me more about combustion chamber design. as i understand it, morphology influces gas flow, density, turbulence and pressure wave propagation. this in turn does affect the stability of the resulting cylinder charge on compression, hence octane matters. i'm /not/ an expert on this stuff joe, but i do have some books on the subject, so please, enlighten me further. and please, let's keep the flame limited to the spark-induced variety. |
Re: Octane Overkill
Thanx for all the advice, folks. I appreciate it. I'll vote for saving
money and stick with regular unleaded (87 octane) from now on. On this note, I have one other question: Does gasoline lose its potency if it sits for awhile? The reason I ask is because I notice that when my tank runs almost on "E" and I refuel, my car seems to be more responsive and run a little smoother. Does a fuller tank cause better fuel delivery somehow, or what? (I'm thinking the level of fuel in the tank shouldn't matter...that's what a fuel pressure regulator is for...to keep the fuel pressure constant) Why does it seem to run a little better right after I refuel, regardless of brand of gas? Thanks again! :-) Jonathan |
Re: Octane Overkill
Thanx for all the advice, folks. I appreciate it. I'll vote for saving
money and stick with regular unleaded (87 octane) from now on. On this note, I have one other question: Does gasoline lose its potency if it sits for awhile? The reason I ask is because I notice that when my tank runs almost on "E" and I refuel, my car seems to be more responsive and run a little smoother. Does a fuller tank cause better fuel delivery somehow, or what? (I'm thinking the level of fuel in the tank shouldn't matter...that's what a fuel pressure regulator is for...to keep the fuel pressure constant) Why does it seem to run a little better right after I refuel, regardless of brand of gas? Thanks again! :-) Jonathan |
Re: Octane Overkill
In article <WV9rd.23969$Mu3.1347292@twister.southeast.rr.com> ,
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote: > Does gasoline lose its potency if it sits > for awhile? The reason I ask is because I notice that when my tank runs > almost on "E" and I refuel, my car seems to be more responsive and run a > little smoother. Does a fuller tank cause better fuel delivery somehow, or > what? (I'm thinking the level of fuel in the tank shouldn't matter...that's > what a fuel pressure regulator is for...to keep the fuel pressure constant) > Why does it seem to run a little better right after I refuel, regardless of > brand of gas? If you're running your tank out every week or so like normal drivers, gasoline doesn't lose anything. It's in your mind. If you're filling up every 6 months or so, there could be a problem. Gas does get old. |
Re: Octane Overkill
In article <WV9rd.23969$Mu3.1347292@twister.southeast.rr.com> ,
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote: > Does gasoline lose its potency if it sits > for awhile? The reason I ask is because I notice that when my tank runs > almost on "E" and I refuel, my car seems to be more responsive and run a > little smoother. Does a fuller tank cause better fuel delivery somehow, or > what? (I'm thinking the level of fuel in the tank shouldn't matter...that's > what a fuel pressure regulator is for...to keep the fuel pressure constant) > Why does it seem to run a little better right after I refuel, regardless of > brand of gas? If you're running your tank out every week or so like normal drivers, gasoline doesn't lose anything. It's in your mind. If you're filling up every 6 months or so, there could be a problem. Gas does get old. |
Re: Octane Overkill
"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message news:WV9rd.23969$Mu3.1347292@twister.southeast.rr. com... > Thanx for all the advice, folks. I appreciate it. I'll vote for saving > money and stick with regular unleaded (87 octane) from now on. On this > note, I have one other question: > Does gasoline lose its potency if it sits > for awhile? yes. it will sour, turning into a substance not unlike varnish. but this can take a long time. stale gas is a problem when you take your snowblower out after 10 months of dormancy. >The reason I ask is because I notice that when my tank runs > almost on "E" and I refuel, my car seems to be more responsive and run a > little smoother. Does a fuller tank cause better fuel delivery somehow, or > what? (I'm thinking the level of fuel in the tank shouldn't matter...that's > what a fuel pressure regulator is for...to keep the fuel pressure constant) > Why does it seem to run a little better right after I refuel, regardless of > brand of gas? it just seems to run better. at least as far as the gas goes. you might other motor issues though. i cant think of any, but as far as the gasoline goes, it is not going to cause any difference between weekly fill ups. > Thanks again! :-) > > Jonathan > > |
| All times are GMT -4. The time now is 02:37 AM. |
© 2024 MH Sub I, LLC dba Internet Brands