[Diy_efi] Intro, and q's about fuel economy

[Greg Hermann]

If this engine has an updraft carby, STAY WITH THAT CONFIGURATION !! Aim
the injector right AT the area where the edge of the throttle butterfly is
as it begins to open--there is sonic flow there, which will help greatly in
atomizing the fuel. An exhaust hot spot in the intake manifold above the
butterfly is another VERY helpful thing. One could also aim the injector
directly AT such a hot spot.

Thinking about this a bit more, I would be inclined to try to aim an
air-shrouded injector _DOWN_ at (the high velocity area of) an _UPDRAFT_
throttle butterfly.

This would make it relatively easy to vent (bypass) any vapor in the
preheated fuel out of the injector and the fuel rail, and would also give
_REALLY_ effective atomization of the fuel. Would certainly avoid having
any large, non-combustible droplets getting into the cylinder.

Greg



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