CrossFire/'7747

[Bruce]

The problem area with the Xfire is right below the throttle bodies.   That's
the reason for the turbolators (new term from CSH, HQ).
Bruce


----- Original Message -----
From: "David & Cheryl Haggard" <david at newcovenant.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, July 22, 2001 8:10 PM
Subject: RE: CrossFire/'7747


> > FWIW,
> > just remember, the air's velocity goes up with the smaller
> > bores, and making
> > the bends to the ports just might try to drop the fuel out of
> > suspension
> > more so, then larger single bores, would.
> > Bruce
>
>    Just the kind of feedback I'm looking for.
>    But actually, there is very, very little more bend in my runners now
than
> there were originally. The runners are mainly just taller.
>    As I see it, the Crossfire may force compromises no matter what you do.
> Originally, the runners are very straight, and make for high air velocity.
> But they're so small you can't get high-rpm power out of them. They're
built
> for gobs of low-end torque.
>    Opening up the runners as I have will support rpm well past my targeted
> 6500 rpm red line in my 305. But how my low end will suffer I won't know
> until everything is bolted on and tuned up.
>    Temporary unemployment has put a serious hold on my build, which was
> supposed to be done last month. As it is, I just ordered my timing set
this
> weekend. A Cloyes "TRUE" roller set for "small block Chevy originally
> equipped with roller camshaft." 80 bucks from Jeg's. Ouch! Cam and rockers
> are on hold for a bit longer. When the budget will clear them, I'll build
it
> and we'll see for sure.
>    <sigh>
>    I looked into the Offenhauser Crossram manifold, but decided it's way
too
> much manifold for a streetable 305.
>
> Dave Haggard
>    1988 Formula Firebird
>    305 2 X 2-bbl CFI (under construction)
>    http://www.newcovenant.com/firebird/
>
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