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Practically, Valve overlap at what range at BDC?(a) 10°-30°(b) 40°-75°(c) 20°-60°(d) 80°-150°The question was asked in homework.My doubt is from Valve Timing topic in section Valve Timing Technologies of Automotive Engine Design

Answer»

The correct answer is (d) 80°-150°

To explain: PRACTICALLY, Valve overlap at20°-60° range at TDC and Valve overlap at 80°-150° range at BDC. THEORETICALLY, the VALVES open and close INSTANTANEOUSLY at the dead centers.



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