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FUELforTHOUGHT
by Dave Koehler
10/9/03
I have an LS-6 in my Chevelle and as it is
a street car that sees a total of 10 race meets
a year, I decided to put an RPM air gap on it!
It pulls hard to 6500 and I have been looking
at some nitrous kits (250) shot to make things
more interesting! I have been told that the
dual plane intake does not work well with juice
(something about distribution issues) and I
was wondering if a plate kit on a 2 inch spacer
may make this less of a problem? I have heard
of a twin spray bar plate design unit that I
think they call a Gemini system. Is this the
answer? Thanks in advance for your help on this.
J. Jeffrey
J.,
For your goals and the range
you want to work in, the manifold you have will
be fine. There are a couple of ways to work
this.
- One is the spacer you spoke
of. A 1/2 to one inch spacer is usually sufficient.
- Machine the divider down
a little and blend any interference spots.
- Don't worry about it.
Number 3 was a joke, son. Due
to the manifold casting production tolerances
the plenum divider can be too wide or even offset
to one
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side.
This is where the scare stories originate. One
side could get all the spray because it is bouncing
off of the divider.
The spray bars are already
at least 1/4 inch above the divider, plus the
gasket so it may not be a problem. If it is
not visually obvious that the spray pattern
will be OK, you will need to do a simulation
test. Activate the fuel side without the carb
installed and see what takes place. Pull the
spark plugs and DISABLE the ignition! After
testing, rotate the engine to remove any fuel
that may have gotten to the cylinders. Let it
air evaporate for a while also. Observe all
safety precautions. A better, safer way is to
remove the manifold and just run some water
through the plate on the bench.
While it is off you may want
to do some blending and port match the plenum
to the carb anyway. Hope this helps your purchasing
decisions.
Have a safe race
Dave Koehler
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