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Which technology changes the timing of intake/exhaust valves when the engine is running?

(a) CRDI

(b) DOHC

(c) TDI

(d) VVT

This question was posed to me in exam.

I want to ask this question from Variable Valve Timing in chapter Valve Timing Technologies of Automotive Engine Design

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The correct answer is (d) VVT

To explain I would say: VVT is a generic term for an automobile engine technology that allows the timing os the intake/exhaust valves to be changed when the engine is working.

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