Asked by David
                 How long would it take a car engine, say 500 pounds of iron, to cool from 1,200 degrees F (exauhst manifold temp) to air ambient temp. of 75 degrees F.
            
            
        Answers
                    Answered by
            drwls
            
    It will approach the air ambient temperature asymptotically. The time it takes for the temperature to get within a few degrees of ambient will depend upon the heat transfer rate as well as the mass of the engine. Is it being cooled by a radiator, forced convection or natural convection?
    
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