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Why there is a small clearance around the stem of the valve?

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in Automotive Engine Design by (137k points)
Why there is a small clearance around the stem of the valve?

(a) Lubrication

(b) Cooling

(c) Heating

(d) Strengthening

I have been asked this question in an internship interview.

Asked question is from Poppet Valves topic in portion Valve Timing Technologies of Automotive Engine Design

1 Answer

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The correct choice is (a) Lubrication

Easy explanation: The small clearance around the stem of the valve for lubrication. The valves experience a high temperature since it is in direct contact with the combustion heat. Hence, lubrication is required.

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