off list carb question

[Warwick Anderson]

I have seen a way of working it out (kinda like how wes worked out choke
sizes, but cant remember where I saw it.
main interest was the difference of a 45mm hole and a 38mm hole(holley)
Maybe should build the flow bench now instead of later?      lol


----- Original Message -----
From: "Bruce Plecan" <nacelp at bright.net>
To: <diy_efi at diy-efi.org>
Sent: Monday, January 29, 2001 12:39 AM
Subject: Re: off list carb question


>
> I used to do alot of work with Webers, but don't recall seeing any CFM
> related numbers for them.   They had been used on so may cars, that the
> applications, had the chokes pretty well sorted out or picking a similair
> engine to what you were working on would get you close to start with.
I've
> seen 45s used with just a single tube intake, with the other side blocked
> off.
>    Now being EFI specific,  it seems to be *common* knowledge a GM dual 2"
> TBI is 670 CFM, the 1.8" butterflies about 450.   Needless to say the type
> of manifolding makes a huge difference for butterfly sizing, ie
Independent
> Runners allow for very large butterflies, and that is why the 45s seem to
> always use such large chokes in em.
>    I've used a reworked 45 in place of a Holley 600 CFM carb, with pretty
> good results.
> HTH
> Bruce
>
>
>
>
> > any one know how to work out CFM for a weber, eg 45mmDCOE?
> > just would like to know how to work it out
>
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