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Which are the two materials used in a bimetallic piston?

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Which are the two materials used in a bimetallic piston?

(a) Copper and steel

(b) Magnesium and aluminum

(c) Steel and cast iron

(d) Aluminum and steel

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The query is from Engine Components topic in section Basic Engine Components of Automotive Engine Design

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The correct answer is (d) Aluminum and steel

Easiest explanation: The bi-metal piston is made from both steel and aluminum. The skirt is formed by steel and the aluminum alloy cast inside of forms piston head and piston pin bosses. As the coefficient of thermal expansion for steel is quite small, the piston will not expand and hence smaller cold clearance can be maintained.

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