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Arrangement Speed through Radiator As Propn of Car Speed Contribution to Cd (Drag Coefficient)
A Front mount venting into engine bay 27% 0.025
B Front mount ducted to wheel well 14% (52% of A) 0.020 (80% of A)
C Ducted to bonnet/hood 25% (93% of A) 0.010 (40% of A)
D Top-mount inlet ducted to underside 10% (37% of A) 0.020 (80% of A)
These figures are indicative only. For example, ducting exhaust air from arrangement C along rather than perpendicular to the bonnet will reduce the increase in Cd.
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• For the oil cooler, build the inlet duct at ½ length and exhaust through an exit duct shaped to exit air downwards in front of each wheel.
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Or duct across the face of the tire and exhaust in a curtain across the face of the front wheel.
There are aerospace coatings that increase hear emissivity. Dip your radiator and heat exchangers in that.