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Practically, Exhaust valve opens at what range before BDC?(a) 10°-30°(b) 40°-75°(c) 20°-60°(d) 80°-150°The question was posed to me during an interview.My question comes from Valve Timing in division Valve Timing Technologies of Automotive Engine Design

Answer»

The CORRECT OPTION is (b) 40°-75°

The explanation: The exhaust valve opens before the piston reaches BDC in its POWER stroke. Practically, the inlet valve opens between 10°-30° range before TDC, Exhaust valve opens at 40°-75° range before BDC.



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