Quote:
Originally Posted by Brookshire my
I just looked underneath and there is one larger and one smaller hole on each side where hot air is released under the engine. Also the flaps that must help sweep the hot air rearward.
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Are you referring to the tube there in the corner? That's where the cabin heat goes forward to get all nice a toasty lukewarm on cold days. Looks like you don't have cabin heat...
And those flaps are there to increase the low-pressure area behind them, like airplane cowl flaps, increasing the delta-pressure top-to-bottom as the cooling air is evacuated downward...and this it happens all around the engine, not just in specific holes.
As Dave noted, maintaining this delta-p is important via a good engine seal all around the engine tin surrounds. Air flows in from the top and out the open bottom of the car.