Re: grams/cfm ?

["Programmer" <nwester@eidnet.org>]

Good job--thanks !!

Lyndon.
----- Original Message -----
From: "David Papworth" <papworth@ichips.intel.com>
To: <gmecm@diy-efi.org>
Sent: Friday, November 24, 2000 9:51 AM
Subject: Re: grams/cfm ?


> 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@eidnet.org>
> To: <gmecm@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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