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Old 09-21-2012, 04:11 AM
454C10 454C10 is offline
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fyi, overlap doesn't reduce compression ratio or reduce cylinder pressure. The engine isn't trying to make pressure at that point in the combustion cycle.

What lowers cylinder pressure is the intake closing point. The later the intake closes the lower the pressure will be.

Use a dynamic compression calculator and it will ask you for the intake closing point. As after the intake closes is when the engine starts to make pressure.
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