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Re: CFM Calucations
I guess... For instance, a head's intake port. As RPMs increase, the velocity of the air increases. There reaches a speed where (as a vague general rule) the speed of the intake charge won't go any faster and power starts to drop off. Its at this point where the power curve has peaked and starts dropping off.
Porting that same head means that you can get more CFMs before that speed is attained. Basically, you've slowed down the flow which shifts that peak speed to a higher RPM. I just remember that there is a generally accepted speed at which it peaks.
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