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Which of the following is coated outside along with a conventional cast-iron sleeve in a hybrid liner?

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Which of the following is coated outside along with a conventional cast-iron sleeve in a hybrid liner?

(a) Austenitic steel 21-4N

(b) Nimonic alloy

(c) S.A.E 1045

(d) AlSI 12 alloy

I had been asked this question in a job interview.

This intriguing question originated from Engine Components topic in section Basic Engine Components of Automotive Engine Design

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Correct option is (d) AlSI 12 alloy

Explanation: The hybrid liner produced at Federal-Mogul’s Fried Berg (Germany) factory, consists of a conventional cast-iron sleeve coated on the outside with on AlSi 12 alloy with a melting point below that of the aluminum engine block, using a proprietary Federal-Mogul process.

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