Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost?

skiwesser · 04-03-2007, 07:21 PM

I know a guy with a relatively newly rebuilt vortech A-trim (that's 5 PSI right?), but I figure that's out of the question for me, 58cc heads, flat tops with like 4cc eyebrows in them.

Or is it?????
I just found out he had it today and never planned on putting any boost to it but if it'd live I may do it what do you think?

andy669 · 04-03-2007, 08:30 PM

Make sure you have a good tune, and theres absolutely no reason why it wouldnt last.

Andy

USMC302 · 04-04-2007, 12:40 AM

You'll be fine, I know a guy right now that's running 11 to 1 with a 150 shot, still on pump gas, not sure how but like Andy said, it's all in the tuning.

Dark_5.0 · 04-04-2007, 10:31 AM

Mach 1's are 10.5 to 1 and lots of them are boosted. Most VTEC Hondas are 11 to 1 and lots of them are boosted.

Its "all" in the tune. You can still run all the boost you want, you will just need a diffrent tune than a low compression motor.

1989GT · 04-05-2007, 08:13 AM

More compression + boost = more power. As long as you have the octane to support it. With 10.5 you should be fine with 5 psi. Also there is more to it than your static compression ratio. Your dynamic compression ratio is really important here. Not sure what the specs are on your cam or how you have it installed but that'll play a large part in how much boost you can run.

skiwesser · 04-07-2007, 11:32 PM

Cam is: 221/225 @ .050 dur. .499/.510 lift

04-03-2007, 07:21 PM	#1
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? I know a guy with a relatively newly rebuilt vortech A-trim (that's 5 PSI right?), but I figure that's out of the question for me, 58cc heads, flat tops with like 4cc eyebrows in them. Or is it????? I just found out he had it today and never planned on putting any boost to it but if it'd live I may do it what do you think? __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

04-03-2007, 08:30 PM	#2
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? Make sure you have a good tune, and theres absolutely no reason why it wouldnt last. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

04-04-2007, 12:40 AM	#3
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? You'll be fine, I know a guy right now that's running 11 to 1 with a 150 shot, still on pump gas, not sure how but like Andy said, it's all in the tuning. __________________

04-04-2007, 10:31 AM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? Mach 1's are 10.5 to 1 and lots of them are boosted. Most VTEC Hondas are 11 to 1 and lots of them are boosted. Its "all" in the tune. You can still run all the boost you want, you will just need a diffrent tune than a low compression motor. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

04-05-2007, 08:13 AM	#5
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? More compression + boost = more power. As long as you have the octane to support it. With 10.5 you should be fine with 5 psi. Also there is more to it than your static compression ratio. Your dynamic compression ratio is really important here. Not sure what the specs are on your cam or how you have it installed but that'll play a large part in how much boost you can run. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

04-07-2007, 11:32 PM	#6
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Re: Could a 10.25to1- 10.5to1 motor live long with 5 PSI of boost? Cam is: 221/225 @ .050 dur. .499/.510 lift __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

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