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Oh, and Blau911, those low compression 2.4 E pistons aren't exactly helping either. Even if you flycut 1mm from the heads, and didn't space the cylinders to compensate, that's still only 9/1 at best. Big ports and wild cams like high compression to help fill in the bottom of the torque curve.
You can get away with higher compression on an angine with high overlap cams, since the overlap acts like built-in EGR. Some of the inert exhaust gas gets left in the cylinder due to the overlap, and this results in lower combustion temps since a portion of the mix is incombustible. This helps fight detonation.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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