Volumetric efficiency

[Camden Lindsay]

How does one go about approximating volumetric efficiency at differet rpms?

I ask because the excellent spreadsheet posted a couple of weeks ago 
(turbosize.xls) requires it as input, as does the megasquirt fuel system.

I (think i) know that the VE of a n/a motor is peaky, whereas a forced 
induction motor is mutch flatter (??due to less reliance on tuning frequency 
of intake/exhaust manifolds, tracts, valves, etc??)

could i use some type of mass meter affixed to the intake of a n/a motor 
while running and compute VE using the appx air mov't (volume *rpm/2, i 
think)divided by the output of the meter?  Or is there a simpler way which i 
am missing?

Thanks for any help
Camden Lindsay

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