Q2. A. Explain the term Variable Injection Timing (VIT) when applied to fuel pumps and state why a change in timing of fuel injection may be required.;
B. Describe, with the aid of sketches a VIT fuel pump and explain how the change in timing is achieved whilst the pump is in operation
C. Explain how it may be determined that individual fuel pumps are injecting the correct quantity of fuel with the correct timing at a particular pump setting.
Q6. Variable injection timing was introduced to bring down SFOC figures, especially over a wide range of power. Explain with a graph the variation in Pmax with respect to engine power, with VIT in use and without.
Explain clearly how the fuel consumption is reduced. How is VIT and FQS achieved in camshaft less engines. (16)
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