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Originally posted by mellowboy
I don't think i agree with you on this one. The stock bottom end can only take so much. High compression to my understanding is that its good for all motor not boost? I have never heard anyone say higher compression is better for boost. Theres this guy that i see driving a rex with a built b18c1 that he lowered the compression ...lets just say he built up his motor and slapped a turbo on there running 18-22 pounds of boost rite there! He's running 11's with no problems watsoever! I only know that built bottom end with lower compression handles the higher boost ...safely.
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The stock bottom end can take a lot of boost. Take myself for example: I ran 12.3 on my bone stock B16A on 12psi...This car was my daily driver...all day, every day, my only car. Not only that, but my Mugen ECU raised the rev limiter to 9000rpm...and I took it to that every day. Don't underestimate the power of the B-series motors. A properly tuned STOCK B-series motor can run that pressure that your friend runs on his built motor...just trust me on this one...I've been doing this for years. I've seen bone stock Poormans ITR's (B16A head on a B18C1 shortblock), running 11's on 12psi and slicks. Speed is not about built motors and low compression. Speed is about proper tuning, and the correct turbocharger matched with the motor, suspension, and slicks. $100 says that I can match your buddies time, or even beat it, with a budget $10,000 less than his.
The B-series motors are strong, very strong. They can withstand the pressure that it takes to make more than 350hp, with the stock internals, and the stock compression. The key to dialing in the motor is perfecting your air:fuel ratio. Since the internals are very strong to begin with, your pistons are what your major concern should be. They will be the first thing to let loose if your a:f ratio is off. Once your a:f ratio is dialed in perfectly, your next major concern falls on your cylinder sleeves...but that isn't a concern until you are making about 350hp. Within the tuning of the a:f ratio, your compression will already be accounted for, and taken care of.
I have seen stock B16A's, B18B's, and B18C's pushing more than 20psi!!! The only thing you have to worry about is
not running like that for too long...quarter miles bursts are perfectly safe, when your motor is tuned.