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Calculate the free length of the spring when the solid length is 90mm and δmax=35.75mm?

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in Automotive Engine Design by (137k points)
Calculate the free length of the spring when the solid length is 90mm and δmax=35.75mm?

(a) 145.9mm

(b) 69.65mm

(c) 656mm

(d) 131.11mm

This question was addressed to me in an international level competition.

This intriguing question comes from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

1 Answer

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Right choice is (d) 131.11mm

For explanation I would say: Free length= solid length+δmax+0.15δmax

=90+35.75+0.15(35.75)

                                               = 131.11mm

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