Hi everybody, I will be building up my motor for turbo this includes new rods and pistons(Overbore) I want to know the best compression ratio to be ran for the maximum amount of boost. like if I run 8.5:1 can I run 15 psi of boost SAFELY. Without blowing up the motor. My car is a 96 Acura Integra RS with the 1.8L

Feedback appreciated


[Modified by turboteg96, 1:43 PM 12/28/2001]

 

well the first problem you run into is the octane barrier, depending where you live int the sates your gas is crap. consider that for every 4psi you can assume a rise in CR by 1, 15PSI is roughly an additional 4 dynamic compression points. your 8.5:1 is now 12.5:1 with very high cylinder pressures, i would not run anything less than pure 94 octane without any of that corn oil crap. Now if you build a lower PSI motor like 9PSI you can stil have a decent 9.2 (LS) or like 10:1 motor and still run pretty safe with a great bottom end.
cheers - oh yeah you should have searched for this first.

 

9:1 compression is perfect for boost.. Just stick with 9:1 you can run 12psi safely on pump gas and then run 15psi on race gas.. appropiate tuning of course

 

Thanks, I just wanna be safe and not blow up my motor at the same time.