[Diy_efi] Throttle body sizes

[Jeff Behrens]

To answer your question on the 454 throttle body, I
believe a good ballpark to use is 670 cfm.



Jeff
--- Dave Dahlgren <ddahlgren at snet.net> wrote:
> Holley uses 1.5" Hg for 4 barrel carb and 3" Hg for
> 2 barrel for it is worth or
> however it might covert... Most cylinder head
> porters use either 25 or 28 " WC
> from what I have seen as well.
> Dave
> 
> Brian Dessent wrote:
> > 
> > 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.
> > 
> > Could be wrong, but I think the common standard is
> 25" WC of pressure.
> > That equals 0.903psi or 6.23kPa if my units
> program can be trusted.
> > 
> > Brian
> > 
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> 
> 
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