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dunno about that. the boxster engine is in a closed-top compartment that is open at the bottom. heat rises, and will hang around the engine unless moved. the fan in the side vent does just that - it tries to push the hot air out the bottom. i would call it a compromise more than an engineered solution. if you want to talk heat transfer, having a fan on only one side of the engine will cool one side more than the other; even with perfectly engineered airflow around the engine, the air will have heated by the time it reaches the intake side of the compartment.
open the top and the hot air can get out on it's own, especially given the low pressure area back there.
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