[Diy_efi] RE: formulas for CFM rates

[Dogleg Racing]

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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