1. The problem statement, all variables and given/known data Many automobile engines have cast-iron cylinders and aluminium pistons. What kinds of problems could occur if the engine gets too hot? (The coefficient of volume expansion of cast-iron is approximately the same as that of steel.) 2. Relevant equations Relation of volume to temperature 3. The attempt at a solution The coefficient of volume expansion of steel is 4.8*10-5(C°)-1. I don't see the relevance here of this numerical value. Do you? The problems I could come up with: 1. The cylinders and pistons would expand and frictional forces would act between the cylinders and the pistons. This would lead to a slower rate of speed of the automobile for a given rate of fuel consumption. 2. Any others???