Bill,
Fantastic picture!

       I hope the real manifold looks half as good as the CAD rendering.

Look back over the published data, then look at the Mazda intake at full
blast, and you will come to the conclusion that for our purpose very short
runners are best , the Mazda manifold lends itself to cutting and welding,
whilst retaining the injector mouldings and fuel rail. What could be
simpler? We just have to convince Tracy that 3 injectors are better than
two.

       The stock long runners make 247 HP. From what I have seen, short
runners have yet to make over 200 (at under 9000 RPM.)

       The stock manifold is REALLY heavy. I suspect that the heavy
aluminum casting was chosen to reduce noise.

       I thought hard about using some portion of the stock manifold, but
it really doesn't reduce the overall effort, once you have elected to use
carbon fiber composite for the rest of the manifold. You have to mate up
the composite using a flange of some sort. If you retain some of the stock
manifold, you must fabricate a flange on it to mate to the rest of the
manifold. It is simpler to build another 6 inches of composite manifold.
This way, you skip the process of carving up the stock manifold and
attaching some sort of flange to it.

       I also evaluated using the plastic portion of the stock manifold.
After I modeled it up in CAD, I discovered that it won't quite fit under
the cowl. It's close, but it doesn't _quite_ fit.

       Bill Dube'



Bill, please credit the people you are quoting by including their names
at the end of their quote. Also it helps the new people on here if you
quote the entire message.

People have had problems in the past with all plastic runners.
Heat soak after a run can be a problem. Some have been known to burst
when the inevitable back fire happens. I think Tracy experienced that
problem as I recall.

Paul Lamar

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