grams/cfm ?

[David Papworth]

Given the resources of the internet, this isn't difficult to
derive, although the numbers that come from basic
physical constants may need to be modified depending
on assumptions -- particularly corrections for
humidity and some non-zero pressure drop
across the points being measured. I am sure there
is a specific set of "automotive" assumptions not
factored here:

The "standard atmosphere" weighs 1.2 kg per cubic meter
One meter is 3.28084 ft
60 seconds in one minute
1000 grams per kilogram
=> One cubic meter = 35.315 cubic feet
=> One cubic foot = 1.2 * 1000/35.315 = 33.98 grams
=> grams per second = CFM * 33.98 / 60.
=============================
=> grams per second = CFM * 0.5663
=============================

Check:

SBC produces ~350 HP on ~600 CFM at BSFC of .5
and AFR ~14:1
350 * .5 = 175 lb per hour = 2.92 lb per minute = 1326 gm per minute (fuel)
=> 18560 gm per minute of air
18560/33.98 = 546 CFM
Close enough to our 600 CFM assumption



----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Friday, November 24, 2000 10:27 PM
Subject: grams/cfm ?


> Hey guys,
> Anyone got a calc for grams/second to cfm ? Or do
> they really correlate to real world numbers ?
>
> Lyndon.
>
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