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What is the value of the valve overlap, for a smooth idle and healthy low rpm torque?(a) 0(b) 40°-75°(c) 1(d) 80°-150°This question was posed to me during an internship interview.Asked question is from Variable Valve Timing topic in section Valve Timing Technologies of Automotive Engine Design

Answer»

Right answer is (a) 0

For explanation: For a smooth idle and HEALTHY LOW rpm torque we NEED to have zero VALVE overlap between the inlet and exhaust valve. Hence, 0 is the right answer.



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