[Diy_efi] RE: formulas for CFM rates

[Mark Linder]

Not exactly what I was looking for, but that does give me enough
information to figure out what I needed to know.  Thank you.

What I was really looking for was the formula where you gave it the bore
size and air pressure and you could calc the CFM that would flow through
the bore.


 
Mark


-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Dogleg Racing
Sent: Sunday, January 04, 2004 3:40 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] RE: formulas for CFM rates 


I am catching up on e-mails so my apologises for the late reply.

Corky Bell in his book Maximum Boost advises that the maximum air
velocity 
should be less than 300 ft/sec (90m/sec) "to keep the flow losses 
acceptable".  Velocity can be calculated by the formula:

Velocity = Airflow rate (cfm) divided by Area of Throttle body (sq
inches)

... and cfm is calculated by engine size (cu in) divided by 1728
multipied 
by max rpm divided by 2

Cheers


>Date: Mon, 15 Dec 2003 15:50:29 -0800 From: "Mark Linder"
><mark.linder at verizon.net> To: <diy_efi at diy-efi.org> Subject: [Diy_efi] 
>formulas for CFM rates
>
>Back on the old list someone had posted the formula for calculating CFM
>based on bore size.  Does anyone have that formula? Also, if anyone
knows 
>the CFM rating of a 75mm Mustang style throttle body, please post it.

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