RE: manifold machining

[John_Calabrese@ENGELHARD.COM]

Actually, you want the injectors a little higher on the intake manifold
runner to assist in mixing.  Yes, pointing injectors at the back of the
valves helps for emissions and colder running combustion, but the
vaporization actually hurts VE a little, so for racing, a little farther
away is what you want, and on the street, point them at the valve.




Frederic Breitwieser <Frederic@xephic.dynip.com>@diy-efi.org on 04/07/2000
09:41:01 AM

Please respond to gmecm@diy-efi.org

Sent by:  owner-gmecm@diy-efi.org


To:   "'gmecm@diy-efi.org'" <gmecm@diy-efi.org>
cc:
Subject:  RE: manifold machining


>clearances available for the fuel rails and the angles the injectors
>will have to sit at to put fuel rails where they need to be.

I would also recommend mounting the bungs as far away from the plenum as
possible, meaning right on top of the valves.  Mists of fuel on hot valves
tend to assist proper atomization, and gives more room in the center of the
manifold for larger plenums.  My 451cid stroker mopar has a 1232 cid
plenum,
and my 252cid Buick V6 has a 576 cid plenum.  Though, there is nothing
wrong
with mounting the throttle body right where the carb goes with an adaptor
plate, for a street car.  Racing is a different story.
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