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Why aluminum alloy pistons are used in highly rated engine?

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in Automotive Engine Design by (137k points)
Why aluminum alloy pistons are used in highly rated engine?

(a) Due to its thermal factor

(b) Due to its alloying element

(c) Due to the piston speed

(d) Due to circular

The question was posed to me in class test.

The question is from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

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The correct choice is (c) Due to the piston speed

The best I can explain: Highly rated engines are mostly used in race cars and high-end cars; these cars require speed. Aluminum pistons can achieve piston speed above 6m/s. Hence, aluminum alloy pistons are used in a highly rated engine.

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