[Diy_efi] Throttle body sizes

[Dave Dahlgren]

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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