VOLUMETERIC EFFICIENCY: If you've forgotten is the volume of the intake charge-inhaled during the intake stroke vs. the actual displacement of the cylinder. Excess backpressure causes what is known as reversion. Reversion is when hot exhaust gas gets pumped backwards into the engine during the overlap period. This can cause the engine to get excessivly hot as cross flow of the cool intake charge-during overlap is one of the ways the engine cools itself internally. This can cause detonation if the backpressure is to much.
Something to think about.
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