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Old 01-16-2013, 08:37 PM
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Here is a good article on dynamic compression ratio:

Classic Inlines - Compression Ratio's

As you can see the dynamic compression is what the engine actually sees in operation. This can be manipulated by valve event timing in other words at what point in the cycle of the cylinder does the valve actually close.

I have tried most all of it and now do what is known to work..
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