What is 100% VE?

[RABBITT_Andrew at mail.orbeng.com.au]

>You get a A grade Pass. All of the things you mentioned are true 
>including peak talk occurs at peak VE. Now with a normal family car 
>the VE is only about 60-75% due to lef....

[snip]

>.... The best way to measure this is to use an airflow meter at peak 
>torque and divide it by the RPM you are doing. There are other ways 
>of measuring it but they are indirect and imprecise.

you get a D grade Fail for algebra! :)  The results of your formula 
would give you the mass fraction of raw grass in bovine faeces.  
Here's a formula that should work:

	VE = m_dot / ( N * Vol * Rho / 120 ) * 100

where:  	VE - volumetric efficiency (%)
		m_dot - mass air flow (g/s)
                N - crank speed (rpm)
                Vol - Engine Displacement (litres)
                Rho - Manifold Air Density (g/litre)

where:          Rho = 1.202 * MAP / 101.325
 		MAP = Manifold Absolute Pressure (kPa)

You should also compensate the air density for temperature too since 
the 1.202 is air density at 20_C and inlet temperature is elevated due 
to heat transfer from the manifold surfaces etc.

Also VE for family cars these days will probably be better than 80%.