Three 2bbl throttle bodies

[Bruce Plecan]

> > I'm currently underway on a project of designing a TPI system that will
> > use 3 2bbl throttle bodies. The idea is to have the old six pack look
> > with new technology performance.

Lotta work,
Using 3-2s makes for lousy plenum.  Dual quad could be done, and get close
to an IR, Independent runner.  Ain't nothing gonna beat a IR for N/A, and
second runner up is crossram.  I think hiding the TPS in a float bowl, and
using holleys with some bogus lines would the slick.  Punch out the
venturis, and clean up the air horns, oh well daydreaming is allowed here.
What ever you do open them all at once for driveability.  Use a decreasing
radiius linkage for the throttle.
Grumpy


 I have a couple of questions that I can't
> > find the answers for and I hope someone can help me out. I'm building
> > the throttle bodies myself but I don't know what the opening sequence of
> > the butterflies should be. Should all six butterflies open at the same
> > time or should the opening of the butterflies be staggered. I believe
> > in the carburated versions the center butterflies would open first and
> > than when they would reach 60% open, the next set would open, and so on.
> > Would an EFI system need to have this same approach, or could they open
> > all at the same time.
> >
> > My next question is, I need a formula to calculate the CFM for a given
size
> > hole in a throttle body. Does anyone have such a formula. I need to know
how
> > large my throttle body openings should would need to be to achieve about
> > 1000cfm.
> >
> > Thanks in advance.
> > Eric Norgard
> >
> > --
> >
> > Eric Norgard
> > Software Engineer           Voice: 303-415-6146 (Direct)
> > Aztek Engineering Inc.             303-786-9100 (Receptionist)
> > 2477, 55th St., Suite 202   Fax  : 303-786-9190
> > Boulder, CO 80301-2835      Email: Eric.Norgard at aztek-eng.com
>
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