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Why there is a small clearance around the stem of the valve?(a) Lubrication(b) Cooling(c) Heating(d) StrengtheningI 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

Answer»

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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