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rsrmike rsrmike is offline
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Join Date: Jan 2008
Location: Birmingham, AL
Posts: 538
I can't give you an exact answer but word on the street is...

It seems to have something to do with turbulent air. Supposedly the upright fan and resulting shroud to direct the air downward doesn't quite distribute the air equally.

You can tell Porsche was aware by looking at the various directional fins and such in place behind the fan on a "street" 911.

Different engines are notorious for having unequal cylinder head temps which start to be a problem when tuning for maximum power on a race engine.

And when I say "tune for maximum power" I mean, by Porsche race engineers, trying to extract every last horsepower and still let the motor live...

I don't know that most tuners are even capable of or would spend the time needed to tune an engine to the level that a flat fan would become "neccesary"

I think they are mostly eye candy at this point in the 911's life, still very cool though...
Old 08-14-2008, 11:03 AM
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