Quote:
Originally Posted by Efi69Cam
There are two factors that come into play when talking about CR. One is static CR which is computed by the standard computation, the other is the dynamic ratio which is indicative of cylinder pressure. The camshaft plays a bigger role than the static CR in determining the dynamic ratio.
A 12:1 engine with a lot of overlap might run fine on pump gas, albeit at a limited RPM range. That same engine cammed with less overlap would build too much cylinder pressure and likely detonate on pump gas. Lower the CR and the engine will no longer detonate and will have a wider power band.
What this means is that there really is no way to compare HP changes due to static CR changes without discussing the camshaft.
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Good point:
Both Cam Shafts have 114 LSA.