Partial success - final take

[Bruce Plecan]

> Bruce,
> Does this apply to the Xfire?

Especially so.  The cross fires need alot to be right.
If you recall I mentioned increasing the plenum volume.
That also raises the vane assemblie off the manifold floor, and get the
"spray" closer to the ports.  Just looking at the stains on the manifold as
you make changes, is clear.

> If so, is the entire injector tower raised
> .25" and what do you use?

Forget what it was on the stock butterflies, but over an 1/8" with the 2"
butterflies.
I did it with gaskets, so I could experiment with height.
I tune to what works, not to a specific spec...
Bruce

>
> Dominic
> ----- Original Message -----
> From: "Bruce Plecan" <nacelp at bright.net>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, August 28, 2000 5:49 PM
> Subject: Re: Partial success - final take
>
>
> >
> >
> >
> > > Yup, I'm with you all the way on this one Bruce.  Raising the TBI
> > injectors
> > > by at least 0.25" sure helps the situation a bunch.  I often  wonder
why
> > GM
> > > never did this from the factory?
> >
> > There was probably one car, with a real air cleaner conflect so they all
> got
> > cut rather then another part no., or some strange reason like that.
> >
> >  It's pretty straight forward.  Oddly
> > > enough, their solution for one problematic application that comes to
> mind
> > > (93 L19 dual 2" blade 220 style TBI) was to put a deflector drop-tube
> > thingy
> > > below the blade in the passenger's side plenum, to "redirect" the
stream
> > of
> > > fuel that tended to run rearward/down the passenger's side blade at
part
> > > throttle.  Seems kinda like the symptom was addressed, but not the
> > problem?
> >
> > Holley also had a deflector ring at one time with there kit.
> > They don't have the time that us silly folks do LOL.
> > Bruce
> >
> > > Strange.
> > >
> > > Walt.
> > >
> > >
> > > >   In oem applications, as installed, the cone is way too smal in
diam
> > when
> > > > it hits the blade and then all runs off to the low side making this
> > > shearing
> > > > effect more critical, since things are so baddly puddled.  How ever
> > > raising
> > > > the injectors vastly reduces this problem, and lessens the
> effectiveness
> > > or
> > > > criticalness of the butterfly.
> > >
> > >
> >
>
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