Exam Question
(a) With the help of simple diagram, explain Variable Injection Timing (VIT). (8)
(b) Explain with suitable diagram, start and end of VIT points. (4)
(c) Explain with a sketch the variation of P(Max) with VIT position. (4)
Class 4 (4th Engineer)
MEKM
📅 Jan 2025
Reference Answer
### (a) Variable Injection Timing (VIT)
**1. Definition and Purpose:**
Variable Injection Timing (VIT) is a mechanism fitted to marine diesel engine fuel injection systems to automatically alter the *start* of the fuel injection process relative to the engine's load. This is distinct from the fuel rack or governor which primarily controls the *end* of injection to regulate the *quantity* of fuel injected.
The primary purposes of VIT are:
**1. Definition and Purpose:**
Variable Injection Timing (VIT) is a mechanism fitted to marine diesel engine fuel injection systems to automatically alter the *start* of the fuel injection process relative to the engine's load. This is distinct from the fuel rack or governor which primarily controls the *end* of injection to regulate the *quantity* of fuel injected.
The primary purposes of VIT are:
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