Volumetric efficiency

[Bernd Felsche]

Camden Lindsay tapped away at the keyboard with:

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

By measuring the air flow, either directly, or indirectly.

> 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?

You could also use a MAP sensor and calculate the mass of air in the
manifold at a particular engine speed.

-- 
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