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What is the range of clearance given between bearing journals and the bores?

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in Automotive Engine Design by (137k points)
What is the range of clearance given between bearing journals and the bores?

(a) 0.06 to 0.5cm

(b) 0.025 to 1.2mm

(c) 0.5 to 1cm

(d) 0.05 to 0.125mm

I got this question in unit test.

This key question is from Valve Train Component Details in portion Valve Timing Technologies of Automotive Engine Design

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Correct answer is (d) 0.05 to 0.125mm

Easy explanation: The clearance given between bearing journals and the bores are given in the range of 0.05 to 0.125mm. This also helps in cooling and reduces the wear due to friction.

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