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What is the event known as when the inlet valve is generally opened about 50° TDC is known as?

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What is the event known as when the inlet valve is generally opened about 50° TDC is known as?

(a) Valve bent

(b) Valve break

(c) Valve lag

(d) Valve lead

This question was addressed to me in an online quiz.

My enquiry is from Valve Timing topic in chapter Valve Timing Technologies of Automotive Engine Design

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The correct choice is (d) Valve lead

Explanation: The inlet valve is generally opened about 50° TDC is known as valve lead and the inlet valve is generally closed after 45° of BDC is known as Valve lag.

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