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Fperotti Fperotti is offline
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Join Date: Nov 2004
Location: Buenos Aires, Argentina
Posts: 82
Ian,

2.2s pistons in 2.4 engines will take you near the 9:8 CR if I am not wrong. As far as I know high CR's with mild cams will produce even higher dynamic CR's wich doesn't seem to be good for the engine life. In addition the CIS doesn't work properly with very overlapping cams.

A friend of mine has a 2.7CIS carrera with 964 cams and original P/C's. I guess the CR he has is 8.5:1. Perhaps you can find out the similarities between the 964 camshaft and the 2.2/ 2.4 series ones. I really don't know if you'll find similarities between these two cams and if you can use 964 cams in 2.4s, I gues you cannot. One thing I can tell you my friends car pull like a train.

What I'd do is keep the CIS, and use 2.2T psitons. You will have 8:8 CR aprox., nice low-end torque and perhaps a little bit of extra power.

Fernando.
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Old 06-02-2005, 01:35 PM
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