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Calculate the mean diameter of the piston boss for grey cast iron piston, when do=50mm?

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in Automotive Engine Design by (137k points)
Calculate the mean diameter of the piston boss for grey cast iron piston, when do=50mm?

(a) 30mm

(b) 50mm

(c) 60mm

(d) 70mm

I had been asked this question in an international level competition.

I'd like to ask this question from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

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The correct answer is (d) 70mm

Explanation: Mean diameter of piston bosses di=1.4×d0

                                                                                     = 1.4×50

                                                                                     = 70mm

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