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Old 05-17-2011, 02:28 PM   #51 (permalink)
The road not so traveled
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Join Date: Jan 2010
Location: New Mexico
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The Truck - '99 Nissan Frontier xe
90 day: 25.74 mpg (US)

The Ugly Duck - '84 Jeep CJ7 Rock crawler
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Is Z supposed to be the port velociy, or the valve opening velocity?
I ask because the equation takes into account valve diameter, but not valve opening.

I noticed that there is no parameter for manifold pressure, wouldn't that affect the actual mach number? Or does it mean that at lower throttle (lower manifold pressure) that a lower velocity/rpm is desireable?

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