Hello, I'm new the the whole online tech support thing, but it seems not many people have knowledge of the questions I ask at times. I currently have a 2001 ITR with cold air intake, Vibrant race header and aftermarket exhaust. I'm rebuilding the top end this year with Stage 2, Skunk2 cams along with new valves, springs and retainers. I'm also upgrading to a 70mm throttle body and port matching the Intake Manifold. My question is that now because my peak power is going to be produced at around 9000 RPM and because of an increase in horsepower, is it necessary to rebuild the bottom end of the engine as well? Are the stock Pistons and Rods strong enough for this modification? Any help would be greatly appreciated. Thanks.

 

the block will be fine, though I would recommend increasing the compression if you want to make use of the skunk2 stage 2's. In my Type R I had the complete skunk2 valvetrain including skunk2 stage 2's, 70mm tb, dc 4-1 jdm version/port matched, ported IM and port matched to tb and head as well. P&P head and I was running ctr pistons with the head milled 20k and I made peak power at 8700 (203whp)...With your set up as you described it you will make peak power quite a bit below 9000 in my opinion. hope this helps!

 

I think the bottom end will be fine. Just make sure to always check your oil, and tune the **** out of it so its not running lean. Otherwise, happy revving

 

I already have the cams, gears, springs, retainers and the high compression valves. The head is still in the machine shop and they are taking off 15K. I'm hoping this will raise the compression enough make use of the cams. I'm using Hondata to tune the setup and will be replacing my OBD2 with and OBD1 ECU. Do you really think peak power will be made below 9000?