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Aircraft engines are inherently designed for downdraft cooling. Think of the 
Cessana, Beech, etc. Ram air comes in the nose by the prop, down through 
engine, then out through cowl vents. Most aircraft engines have the exhaust 
on the lower side for this reason. With upflow cooling, the hottest part of 
the engine may get cooled first, but then that heated air reaches the cooling 
fins on the mid to upper parts of the cylinders. The problem? you dont need 
to worry so much about cooling the exhaust stacks. The cylinders are what 
need to be kept cool.