SIR pistons in a B18A/B???
03-01-2007, 04:29 AM
#2
it'll up your compression to about 11.3:1 but if you're gonna just gonna do pistons, it's a waste of time IMO. if you're building up a whole motor then go for it. i got them for my ls/vtec build
03-03-2007, 04:07 PM
#7
I think it may be worth it if you intend to add some other parts while in the building stage. As integra mark was saying your compression will raise from 9.58:1 to roughly 11.37-11.69:1 after machine work. I think that would be a fairly fun all motor engine. Mind you not everyone can build an engine as you must have the proper maesuring tools and the know how. If you plan on sending the engine in for rebuilding i would think that would be a waste of time because all that money spent and you are only upgrading internal parts with other oem ones. In my opinon i don't think its worth doing unless pistons were treated and other internals were changed out (ie. rods). It can be done and would probably be fairly interesting to see the final results.
03-03-2007, 04:21 PM
#8
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well, I'm not out to race or anything. The fact of the matter is, I know I'm gonna need a rebuild cause its burning oil. i could swap motors, but I'm not that crazy about the VTEC motors cause the only affordable one (B16) would be too weak for a integra. I figured if I'm gonna rip it apart, might as well, bump up the compression or something, not like a VTEC head isn't possible in the future, but i doubt it. especially with the B18 bottom end, i wouldn't wanna rev past 6500.
03-03-2007, 06:18 PM
#9
^^If you shot peen the rods, get some ACL bearings, balance the rotating assembly, micropolish the crank and get ARP rod bolts and main studs, 9000 rpms is a piece of cake. most LS failures are at the rods (rod bolt snap or stretching which causes a spun bearing)
LS blocks are a dime a dozen you can pick up an entire motor for $100 and rebuild it with new and/or upgraded internals. if you build the bottom end to withstand high revs now it'll save you alot later if you wanna slap on a vtec head. machine shops can do bearing clearance check for you as well as tell you everything you'll need. order it yourself and with a chilton manual you can do it all yourself.
i might have an LS laying around if you want it. it needs a rebuild but if you wanna do all that work, you'd have to do it anyways.
LS blocks are a dime a dozen you can pick up an entire motor for $100 and rebuild it with new and/or upgraded internals. if you build the bottom end to withstand high revs now it'll save you alot later if you wanna slap on a vtec head. machine shops can do bearing clearance check for you as well as tell you everything you'll need. order it yourself and with a chilton manual you can do it all yourself.
i might have an LS laying around if you want it. it needs a rebuild but if you wanna do all that work, you'd have to do it anyways.
03-03-2007, 06:27 PM
#10
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I'm not interested in revving to 9000, I'm not even too interested in the VTEC head. And thanks for the offer on the LS motor, but i have one already to be ripped apart. I'll probably run the PR3 pistons on the B18A, and keep it non-vtec. I'd rather have the torque than peak horsepower. When do you think your LSVTEC build will been spinning, i wouldnt mind checkin it out. hear how she sounds.
03-03-2007, 06:58 PM
#11
ok well, your gonna have to do some tuning with a compresson ratio change such as that so you might wanna ask yourself whats the point when you can get a low km b18 for $800 or less from your engine importers. I mean chipping and tuning is not all that bad, but it sounds like your just looking for a replacement.
03-03-2007, 06:59 PM
#12
not till mid to late spring.
if you don't plan on having vtec in the future you can still do the work i mentioned above. just because the motor is capable of 9000 doesn't mean you have to take it there. the ferther away you are from your limits the safer you are.
if you plan on staying full LS you can still get cams that'll help you in the top end. LS's choke in the top end so if you help it breathe better you'll see a good improvement. B16 IM, bigger TB and a 4-1 header helps.
i think i mentioned to you in another thread about the crower cams for sale
if you don't plan on having vtec in the future you can still do the work i mentioned above. just because the motor is capable of 9000 doesn't mean you have to take it there. the ferther away you are from your limits the safer you are.
if you plan on staying full LS you can still get cams that'll help you in the top end. LS's choke in the top end so if you help it breathe better you'll see a good improvement. B16 IM, bigger TB and a 4-1 header helps.
i think i mentioned to you in another thread about the crower cams for sale
03-03-2007, 10:04 PM
#13
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ya crazyae, you are right, i am more or less looking for a replacement,
but I'm thinking a good rebuild would be more reliable than a simple swap.
Never truly know what kms those motors come with or who's driven em.
You also make a good point IntegraMark, i could build the bottom end to take way more abuse than i even plan on throwing at it, but those would be some serious expenses, no?
like micro polishing, shot peening the rods, etc., etc.
Tell you the truth, i'm not even that sure how much that stuff costs?
At fair prices, what do you think those procedures would cost?
but I'm thinking a good rebuild would be more reliable than a simple swap.
Never truly know what kms those motors come with or who's driven em.
You also make a good point IntegraMark, i could build the bottom end to take way more abuse than i even plan on throwing at it, but those would be some serious expenses, no?
like micro polishing, shot peening the rods, etc., etc.
Tell you the truth, i'm not even that sure how much that stuff costs?
At fair prices, what do you think those procedures would cost?
03-04-2007, 12:19 AM
#14
ok well everyone is disturbed by used engines, but realistically if you leak down test it and compression test it that usually says it all right there. I have bought and installed many engine withtout even testing because for one i know the business or individual will not rip me off and i can get warranty otherwise. I mean don;t be discouraged by used engines as they are done all the time. I think your best bet is to get a used engine based on your plans. If not and you want to spend the money to rebuild and do the small upgrades here and there then so be it, but understand the costs before doing so. Call your local machine shop with pricing and advice.
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