cfm calc

[Dave Zug]

velocity pressure VP = (total pressure - static pressure).   if you assume a
MAX VP possible (normally aspirated) of 1 Atmosphere moving to a perfect
vacuum thru the opening  ..28"hg (gotta convert to "wc, I dont have the conv
here) you can get the highest CFM possible thru the opening.

feet per minute FPM = 4005 * SQRT(VP).. VP expressed in inches water column
("Wc)
CFM = FPM * port area in square feet.

hope I didnt mess that up -

----- Original Message -----
From: Mike Swayze <mswayze at truswood.com>
To: GMECM_DIY_EFI <gmecm at efi332.eng.ohio-state.edu>
Sent: Friday, November 26, 1999 8:31 AM
Subject: cfm calc


> I vaguely remember bernoulli(sp.) and sink
> equations-per chance is there an equation in the
> archives for calculating cfm for a throttle body
> based on opening size at WOT?
> Mike Swayze
>