charles harbert wrote:

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?

I don't claim to be an expert on icing.  I do know that ice forms
differently depending on the ratio of the temperature of the surface to the
temp of the supercooled water, the size of the water droplets, etc.  But,
as I think about it more my comments relate more to flying through a cloud
then squeezing water out of clear air.  So, maybe I shouldn't comment much
more.  I'll just fall back on my previous statement.  We saw ice on the
outside of the intake pipes but not the inside.

Jeff Spitzer

 
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