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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
It is my understanding that one point compression increase from 7/1 adds about 5% more power.

In another thread we were talking about the effect of cam valve timing on effective compression ratio. Someone much better at math than I cam up with the effect of different cams on our effective compression. It was as follows.

Quote:
7 /1 measured compression ratio assumed.
6.7 for the 930 (96% of stroke)
6.1 for the SC (88% of stroke)
5.8 for the C2 cams. (83% of stroke)
There are other factors but this makes the stock cam look like it should be the best off idle until boost starts.

Just as the stock cam makes for a higher effective compression, it also captures more of the power stroke before the exhaust valve starts to open.
Old 02-02-2010, 09:01 PM
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