Air Flow Measurement

[Anthony Tsakiris]

>	Specifically, I am wondering if anyone has looked into using a 
differential-pressure manometer to calculate air flow.  This manometer 
could be located in the same location as GM puts its heated-wire 
mass-air-flow sensor.  Any thoughts/comments?

>(FYI - Air flow could be calculated from a differential pressure manometer 
by measuring air pressure in an appropriately sized (perhaps 4 inch dia.) 
venturi located before the throttle plates.  Air velocity through the 
venturi throat is related to the difference in pressure between the venturi 
throat and the pressure before the venturi.  Air velocity is thus used 
(along with air temperature) to determine total air mass flowing into the 
intake system.)


You still need a measure of density to determine mass flow rate, even
if you know the 

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