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once the engine rpms exceed about 3000 rpm its the inertia or rush of exhaust gas mass exiting through the headers that draws in the majority of the intake charge much more effectively than the outside air pressure forces in the fuel/air charge at idle, Id also point out that even at idle the overlap helps considerably, and remember at only 850 rpm that whole cycle is going on 7 times a second, by 7000 rpm, your filling/emptying the cylinders 58 times a second, you would have greatly reduced power above about 4000 rpm without that exhaust scavenging/overlap
once the engine rpms exceed about 3000 rpm its the inertia or rush of exhaust gas mass exiting through the headers that draws in the majority of the intake charge much more effectively than the outside air pressure forces in the fuel/air charge at idle, Id also point out that even at idle the overlap helps considerably, and remember at only 850 rpm that whole cycle is going on 7 times a second, by 7000 rpm, your filling/emptying the cylinders 58 times a second, you would have greatly reduced power above about 4000 rpm without that exhaust scavenging/overlap
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