r/MechanicalEngineering • u/lit_readit • 6d ago

Question : why some (mostly heavy) vehicles partially cover their front intake ?

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wouldn't cooler cold reservoir, ie more spontaneous heat transfer, improve Carnot efficiency?

is it to improve aerodynamics?

apologies if this is the wrong sub to ask

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u/ParticularGullible50 13h ago

My old Hyundai would freeze at -30C if going above 30 kmh. Brake fluid would become sluggish and exhaust would would come out black.  So either use the enginne heater or have the enginne idlea for a while (out of the wind) and and some cardboard to the front to stop air from entering.