CrossFire/'7747

[Marc Piccioni]

What is your runner size now?
-----Original Message-----
From: David & Cheryl Haggard <david at newcovenant.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: July 22, 2001 06:16 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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