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Which of the mentioned bellow is a disadvantage of a poppet valve?(a) Cold start wear(b) Higher overall valve train efficiency(c) Cylinder deactivation(d) Valve stem scuffingThis question was addressed to me in semester exam.This question is from Variable Valve Timing in portion Valve Timing Technologies of Automotive Engine Design

Answer»

Right answer is (d) VALVE stem scuffing

The EXPLANATION is: Valve stem scuffing is DUE to GEOMETRICAL irregularities or over-speeding. This can be corrected by bent or slanted valve, which MAY need replacement.



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