OK what if you were making a manifold for a flat head 4 cylinder with
Siamese ports? I was thinking of mounting the throttle body about 10 inches
from the valves with a plenum behind it and 4 #6 Hilborn nozzles. 2 tubes of
1 1/2 ID (port size) to the manifold face. I was trying to atomize the fuel
and hope each valve would get its fair share. I also have a #2 nozzle near
each port face attached to an electric pump to help with starting only.
Rich Fox
-----Original Message-----
From: Dave Dahlgren <ddahlgren@snet.net>
Subject: Re: EFI 'd Carb Manifold...
>In my opinion it is like this, the factory deal is set up for emissions and
very
>good performance at very low flow rates typical of all the tests they have
to
>pass. most cars use less than 30 hp most of the time so the amount of air
and
>fuel is very small and velocity in the runner is pretty low, so they try
for the
>best possible shot to get the fuel in the port with very little air flow to
>help. they also need the injector close to the port to help with closed
loop
>operation, keeping things close to the cylinder helps close the loop, same
goes
>for the O2 sensor. this is contrary to performance use. Generally you want
the
>injector as far away as you can get it for more time to atomize the fuel.
the
>carb converted manifolds are a compromise to be honest and the ones made
for a
>single 4brl are the worst. See my page for what a 302 ford intake ought to
look
>like converted to a race piece. the one listed as a turbo 302 intake is the
one
>to look at, it will support about 1200 hp.
>Dave Dahlgren
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