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Originally Posted by curtis73
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.
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Is it really fair to compare the peak velocity through the intake with that through a similarly shaped pipe? While the pipe will experience a continuous flow of fluid, the intake on other hand is experiencing more of a pulsed flow. So the inertial effects of the working fluid will being to have a significant impact on the characteristic of the flow through the intake.
Unless of course that is not what you were implying.