Craig, yeah, its not as simple as it sounds is it! But is worthwhile doing
if a good method can be developed.
Cheers
Feral Errol
----------
From: Craig Overend <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Airflow calculations
Date: Tuesday, September 19, 2000 4:36
Errol,
I thought about this before and could not come up with anything.
Because the flow is not constant it may make it extremely difficult.
I don't know that much about measuring irratic flow.
But, I had a thought for constant flow.
One way may be using the bellmouth or carby choke and using a side
tappings to make a venturi meter. A manometer or sensitive 0-1psi(or
slightly more) pressure sensor could be used with a PIC to give
readings. Sensitive sensors are expensive I think. Maybe a MAP sensor
would be useful, just guessing.
The coefficient of discharge would need to be measured which could then
be used with the pressure differential across the tappings to calculate
flow rate. I don't know enough to give an exact answer, I'm still
learning this stuff as a hobby. I'll have a look to see if I have any
books with relevant info. Would be a useful tool for actual testing.
Craig.
Errol Smith wrote:
>
> Terry,
> If you want to measure flows for a particular item then a simple flow
bench
> is the answer. I have made up a "home grown" version using an
electrically
> driven Toyota supercharger for the air pump. For the flow measurements I
> used an inclined tube manometer, and a Pitot tube ( accurate bore
> diameter). The amount of flow for a given bore diameter Pitot tube at a
> particular pressure is readily available. I do not know of an easy way to
> do it accurately on an engine in a moving car.
> Craig, any ideas?
> Cheers
> Feral Errol
> ----------
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