[Diy_efi] Throttle body sizes

Greg Hermann bearbvd at mindspring.com
Fri Jul 18 18:24:13 GMT 2003


At 12:09 PM 7/18/03, Joe Lutz wrote:
>I don't mean to change the subject, but this brings up a question I have.
>At what depression is the standard for rating the flow rate (cfm) of
>throttle bodies and carbs?  There must be a standard because the flow
>obviously depends on the pressure differential so these things would have to
>be flowed at the same pressure for fair comparison.
>
>Thanks,
>
>Joe

Two barrel carbs are tested at 3 in. Hg, four barrels at 1.5 in. Throttle
bodies can vary.

Greg
>
>
>>From: "Chris Carson" <fastcarson at prodigy.net>
>>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>>To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
>>Subject: [Diy_efi] Throttle body sizes
>>Date: Thu, 17 Jul 2003 18:15:01 -0400
>>
>>Does anyone have a chart or list of what the flow (in CFM) would be in
>>various GM TBI throttle bodies with the injectors cut out for use with a
>>MPFI system?? Specifically looking at using the 454 TB, but I am worrying
>>about choking my (warmed over) 403.
>>Thanks, Chris
>>
>>
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