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Rookie you and I agree, as the engine RPM goes up so does the speed of the
engine parts and intake flow. This equates to increased mixture motion resulting
in faster flame travel. As to why an increase in ignition advance is sometimes
required at higher RPM, the generation of in cylinder turbulence does not keep
up with the pace with the reduction in burn time allowed. Twice the RPM equals
half the time for combustion but does not create enough turbulence for a flame
that is twice as fast, so we tune to compensate.
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