Quote:
Originally posted by jluetjen
Chris; I think the other variable that needs to be considered is how retarded are you going to run the ignition? You might be able to get away with 9.9:1, but would have to significantly retard the ignition. In fact a better compromise might (or might not) be to reduce the CR and retard the ignition less.
I'm still hoping to try that experiment on a dyno with my "worst case" 2.0E with it's 9.9:1 pistons. I just don't see an available day coming up here in the next month or two.
Another theory is that I suspect that I'd get less pinging on 93 octane if I were to change to S cams with a longer duration since they would reduce the static compression of the engine.
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I think you missed the part where I mention that my motor is twin plug. 9.9 would be easy with T.P.
-Chris