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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
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Originally Posted by philip j View Post
how about if you ran a higher compression ratio, like 8:1 ? Do you think that would overcome the slow, low end response. Also I think some may have a hard time porting a pancake manifold out to 42mm. Just trying to figure out a few things for my build. thanks Philip
Raising the compression ratio is a solution if your running a cam with some overlap. It won't help much for the lack of proper atomization of the air-fuel mixture due to low velocity/poor swirl in the intake ports.
There's a lot of guys around who've built engines using 38-39 mm ports that make 575-600 fwhp and more. Build an engine with 42 mm intake ports only if you want to run the Texas Mile
Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 12-04-2011, 06:46 PM
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