Originally Posted by
primetime
whats the rest of your set-up, only because if your just doing the block to those specs, you not going to get 300 crank hp. i'm also building that same motor (jdm Type R pistons .25 overbore, CR 11.8:1 to 12.01:1). are you also rebuilding the head, FI, nos, ecu programming, etc. etc. etc. i'm not saying it can't be done, but if it's NA, its going to be tough!!!
I'm not saying that I want to get 300 crank HP, but just that the motor should be good to 300 crank HP. Ideally, I will look for 200-220 crank HP, or about 170-185 WHP with an N/A setup. I may put a 6 psi Jackson Supercharger on to get 260 crank HP or 220-230 WHP.
I currently have a full GSR setup with GSR internals and OEM 10.0:1 compression, P&P GSR head, Type R valvetrain, OEM cams, OEM ECU, Comptech header, Magnaflow high flow cat, Greddy catback exhaust, and full intake.
The builder I previously went to didn't do the bottom end correctly. He gave me too much piston to cylinder wall clearance. I'm consuming excessive oil, the pistons are super noisy at idle and low RPM loads, and there is excess tailpipe emissions. I failed the smog ref twice due to high HC numbers. I changed the cat to an OEM one, and BARELY passed on HC on the 3rd atttempt. No problems with my tuning or plugs either.
So I will yank my motor and redo the bottom end as I described above. My GSR head is working good.