Re: Holy crap people are misinformed
 

"GusTheCat" <GusTheCat.1brooq@realcaraudio.com> wrote in message
news:GusTheCat.1brooq@realcaraudio.com...
>
> LOL, Dude, your car does not run on air, your car run on gas.
> However, with more air you can burn more gas...


Actually, most cars, run on roads <g>.

Re: Holy crap people are misinformed
 

"GusTheCat" <GusTheCat.1brooq@realcaraudio.com> wrote in message
news:GusTheCat.1brooq@realcaraudio.com...
>
> LOL, Dude, your car does not run on air, your car run on gas.
> However, with more air you can burn more gas...


Actually, most cars, run on roads <g>.

Re: Holy crap people are misinformed
 

On Mon, 30 Aug 2004 13:20:06 -0300, "Brian Smith"
<Halifax@NovaScotia.Canada> wrote:
>> LOL, Dude, your car does not run on air, your car run on gas.
>> However, with more air you can burn more gas...
>
>Actually, most cars, run on roads <g>.

Mine sort of rolls, actually.

J.

Re: Holy crap people are misinformed
 

On Mon, 30 Aug 2004 13:20:06 -0300, "Brian Smith"
<Halifax@NovaScotia.Canada> wrote:
>> LOL, Dude, your car does not run on air, your car run on gas.
>> However, with more air you can burn more gas...
>
>Actually, most cars, run on roads <g>.

Mine sort of rolls, actually.

J.

Re: Holy crap people are misinformed
 

"JXStern" <JXSternChangeX2R@gte.net> wrote in message
news:emv7j0lugov97bth8hos898g9kuu8s209c@4ax.com...
>
> Mine sort of rolls, actually.

True <g>.

Re: Holy crap people are misinformed
 

"JXStern" <JXSternChangeX2R@gte.net> wrote in message
news:emv7j0lugov97bth8hos898g9kuu8s209c@4ax.com...
>
> Mine sort of rolls, actually.

True <g>.

Re: Holy crap people are misinformed
 

I think what you are getting at is this: The more air & fuel you can cram
into the cylinder, the stronger the combustion. However, due to the laws of
physics, there is a limit as to how much air and fuel you can cram in there
until the compression ratio gets too high and the fuel spontaneously
combusts on the compression stroke before the spark plug fires. If you want
more power, you'll have to increase displacement by increasing the bore
inside the cylinders, or just get a bigger engine all together.

Jonathan

"GusTheCat" <GusTheCat.1brooq@realcaraudio.com> wrote in message
news:GusTheCat.1brooq@realcaraudio.com...
>
> Chris Aseltine wrote:
>>
>> LOL, Dude, your car does not run on air, your car run on gas.
>> However, with more air you can burn more gas...
>
>
> --
> GusTheCat
> ------------------------------------------------------------------------
> Posted via RealCarAudio.com - The checkmate of the caraudio community.
> http://www.RealCarAudio.com
> GusTheCat's Profile:
> http://www.realcaraudio.com/forums/m...fo&userid=3684
> View this thread:
> http://www.realcaraudio.com/forums/s...threadid=44098
>

Re: Holy crap people are misinformed
 

I think what you are getting at is this: The more air & fuel you can cram
into the cylinder, the stronger the combustion. However, due to the laws of
physics, there is a limit as to how much air and fuel you can cram in there
until the compression ratio gets too high and the fuel spontaneously
combusts on the compression stroke before the spark plug fires. If you want
more power, you'll have to increase displacement by increasing the bore
inside the cylinders, or just get a bigger engine all together.

Jonathan

"GusTheCat" <GusTheCat.1brooq@realcaraudio.com> wrote in message
news:GusTheCat.1brooq@realcaraudio.com...
>
> Chris Aseltine wrote:
>>
>> LOL, Dude, your car does not run on air, your car run on gas.
>> However, with more air you can burn more gas...
>
>
> --
> GusTheCat
> ------------------------------------------------------------------------
> Posted via RealCarAudio.com - The checkmate of the caraudio community.
> http://www.RealCarAudio.com
> GusTheCat's Profile:
> http://www.realcaraudio.com/forums/m...fo&userid=3684
> View this thread:
> http://www.realcaraudio.com/forums/s...threadid=44098
>

Re: Holy crap people are misinformed
 

K-town wrote:
>
> I think what you are getting at is this: The more air & fuel you can cram
> into the cylinder, the stronger the combustion. However, due to the laws of
> physics, there is a limit as to how much air and fuel you can cram in there
> until the compression ratio gets too high <snip>

You probably mean "until the pressure gets too high", Forcing more air
into the engine does not change the compression ratio.

Re: Holy crap people are misinformed
 

K-town wrote:
>
> I think what you are getting at is this: The more air & fuel you can cram
> into the cylinder, the stronger the combustion. However, due to the laws of
> physics, there is a limit as to how much air and fuel you can cram in there
> until the compression ratio gets too high <snip>

You probably mean "until the pressure gets too high", Forcing more air
into the engine does not change the compression ratio.

Re: Holy crap people are misinformed
 

Randolph <trash@junkmail.com> wrote in
news:4134C5B2.3C9F8D72@junkmail.com:

>
> K-town wrote:
>>
>> I think what you are getting at is this: The more air & fuel you can
>> cram into the cylinder, the stronger the combustion. However, due to
>> the laws of physics, there is a limit as to how much air and fuel you
>> can cram in there until the compression ratio gets too high <snip>
>
> You probably mean "until the pressure gets too high", Forcing more air
> into the engine does not change the compression ratio.
>

Sure it does.Compression ratio is the ratio of the volume of the cylinder
at BDC(bottom dead center) to volume at TDC. When you FORCE more air/fuel
mix into the cylinder,you effectively enlarge the volume at BDC(it acts
like a more voluminous cylinder),compressing down to the unchanged original
volume at TDC,thus increasing the compression ratio.

That's why turbos and superchargers use higher octane gasoline,because of
the effective higher compression ratio.
--
Jim Yanik
jyanik-at-kua.net

Re: Holy crap people are misinformed
 

Randolph <trash@junkmail.com> wrote in
news:4134C5B2.3C9F8D72@junkmail.com:

>
> K-town wrote:
>>
>> I think what you are getting at is this: The more air & fuel you can
>> cram into the cylinder, the stronger the combustion. However, due to
>> the laws of physics, there is a limit as to how much air and fuel you
>> can cram in there until the compression ratio gets too high <snip>
>
> You probably mean "until the pressure gets too high", Forcing more air
> into the engine does not change the compression ratio.
>

Sure it does.Compression ratio is the ratio of the volume of the cylinder
at BDC(bottom dead center) to volume at TDC. When you FORCE more air/fuel
mix into the cylinder,you effectively enlarge the volume at BDC(it acts
like a more voluminous cylinder),compressing down to the unchanged original
volume at TDC,thus increasing the compression ratio.

That's why turbos and superchargers use higher octane gasoline,because of
the effective higher compression ratio.
--
Jim Yanik
jyanik-at-kua.net

Re: Holy crap people are misinformed
 

Jim Yanik wrote:
>
> Randolph <trash@junkmail.com> wrote in
> news:4134C5B2.3C9F8D72@junkmail.com:
>
> Sure it does.Compression ratio is the ratio of the volume of the cylinder
> at BDC(bottom dead center) to volume at TDC. When you FORCE more air/fuel
> mix into the cylinder,you effectively enlarge the volume at BDC(it acts
> like a more voluminous cylinder),compressing down to the unchanged original
> volume at TDC,thus increasing the compression ratio.
>
> That's why turbos and superchargers use higher octane gasoline,because of
> the effective higher compression ratio.

Nope, the compression ratio is, as you said, the ratio of the volume of
the cylinder
at BDC(bottom dead center) to volume at TDC. Absolute pressure, mass of
air, etc. makes no difference. If I keep my foot off the throttle, I
draw a moderate vacuum in the cylinder on the intake stroke, and get a
relatively low pressure on the compression stroke, but the compression
ratio is the same no matter the position of the throttle. The
compression ratio is purely a function of the engine geometry. When
turbo charged engine typically require premium fuel, it is because the
*pressure* is high, not because the compression ratio is high.

Re: Holy crap people are misinformed
 

Jim Yanik wrote:
>
> Randolph <trash@junkmail.com> wrote in
> news:4134C5B2.3C9F8D72@junkmail.com:
>
> Sure it does.Compression ratio is the ratio of the volume of the cylinder
> at BDC(bottom dead center) to volume at TDC. When you FORCE more air/fuel
> mix into the cylinder,you effectively enlarge the volume at BDC(it acts
> like a more voluminous cylinder),compressing down to the unchanged original
> volume at TDC,thus increasing the compression ratio.
>
> That's why turbos and superchargers use higher octane gasoline,because of
> the effective higher compression ratio.

Nope, the compression ratio is, as you said, the ratio of the volume of
the cylinder
at BDC(bottom dead center) to volume at TDC. Absolute pressure, mass of
air, etc. makes no difference. If I keep my foot off the throttle, I
draw a moderate vacuum in the cylinder on the intake stroke, and get a
relatively low pressure on the compression stroke, but the compression
ratio is the same no matter the position of the throttle. The
compression ratio is purely a function of the engine geometry. When
turbo charged engine typically require premium fuel, it is because the
*pressure* is high, not because the compression ratio is high.

Re: Holy crap people are misinformed
 

Randolph,

After reading your post and thinking a little, I am inclined to agree
with your logic. However, based on that logic, HOW would someone increase
the actual compression ratio, since the volume of air/fuel inside the
cylinder does not change the ratio? Enquiring minds would like to know! ;-)

Jonathan

P.S. for Jim Yanik: The reason why I am inclined to agree with Randolph is
this: Say your compression ratio is 10:1, you put ten "units" of air/fuel
mixture in the cylinder. It will be compressed to 1/10 of it's original
"size" (volume) upon combustion. If you put in 20 "units", it will be
compressed to a 20:2 ratio, which reduces back to 10:1. 30:3 reduces to
10:1, and so forth. More "units" just causes a more powerful combustion,
creating more pressure to push the piston down more forcefully.

"Randolph" <trash@junkmail.com> wrote in message
news:4134EC5B.36FE2C33@junkmail.com...
>
> Jim Yanik wrote:
>>
>> Randolph <trash@junkmail.com> wrote in
>> news:4134C5B2.3C9F8D72@junkmail.com:
>>
>> Sure it does.Compression ratio is the ratio of the volume of the cylinder
>> at BDC(bottom dead center) to volume at TDC. When you FORCE more air/fuel
>> mix into the cylinder,you effectively enlarge the volume at BDC(it acts
>> like a more voluminous cylinder),compressing down to the unchanged
>> original
>> volume at TDC,thus increasing the compression ratio.
>>
>> That's why turbos and superchargers use higher octane gasoline,because of
>> the effective higher compression ratio.
>
> Nope, the compression ratio is, as you said, the ratio of the volume of
> the cylinder
> at BDC(bottom dead center) to volume at TDC. Absolute pressure, mass of
> air, etc. makes no difference. If I keep my foot off the throttle, I
> draw a moderate vacuum in the cylinder on the intake stroke, and get a
> relatively low pressure on the compression stroke, but the compression
> ratio is the same no matter the position of the throttle. The
> compression ratio is purely a function of the engine geometry. When
> turbo charged engine typically require premium fuel, it is because the
> *pressure* is high, not because the compression ratio is high.