charles harbert wrote:

 Jeff Spitzer wrote:

We've done a lot of research in the icing tunnels lately for our airplanes.
 Ice pretty much sticks in stagnation zones and goes on by everything else.

Jeff, does the quality of the incoming air (wet, moist, cool, density, etc)
affect the amt of ice you could form in the manifold if you achieve freezing
temps from the fuel vaporization, and also, if you start forming ice don't you
now have a non-smooth surface for additional ice build up?

I remember on my early TBI Corvette that they had a provision to run warm air
into the engine. I always thought it was for warm up and emissions, but now I
wonder if it was for possible icing.

I thought that one of the big advantages of FI was that you ran very cold, dense
mixtures into the cylinders (evenly) for maximum power, so to consider heating
the maifold and/or the incoming air for icing would be defeating the purpose. It
might not be ideal for best economy where you want full vaporization prior to
combustion, but I wouldn't want to give up 10-20 hp for it. Maybe Mazda thought
about this when they positioned the injectors where they did?

Jeff mentioned that ice only builds up on stagnated surfaces. There are none
of those in a fuel injection manifold south of the fuel injector.

Paul Lamar

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