cool air
one of the guys in under 2 litre sports sedans used to pack ice around the air box and around the ducting. He found that in an 8 lap race the power was dropping by 20odd horsepower by about lap 5 due to the under bonnet temperature build up. He tried other ways to get air out of the engine bays....but the ice keep it going for the whole race...worked really well.
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