Quote:
Originally Posted by redyaris
0.20 ( throatle ) is a problem because it does not tell you the mass of air getting into the engine. The volume will always be 1000cc regardless of throatle position, what changes is the mass/density of air in the cylinder when the valve closed.
The 0.8 volumetric efficiancy is at optimum engine speed, probably at max torque at wide open throatle.
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You are a little more precise.
20% throttle does not let by 200 cc of air; it still lets in 1000 cc, but the 20% throttle makes that particular volume of air have the density and pressure of 200 cc at atmospheric.
So yes, you are correct, but the math still works out the same.
