Which one of the following is not suitable for C.I engine?

  1. Injector
  2. Inlet valve
  3. Exhaust valve
  4. Spark plug

Answer (Detailed Solution Below)

Option 4 : Spark plug
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Detailed Solution

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In compression ignition (CI) engines, spark plug is not required because the combustion takes places by high compression of air resulting in very high temperature. In CI engines, the injector is used for injecting fuel in highly compressed air. On the other hand, spark plug is used in spark ignition (SI) engines to ignite the air fuel mixture.

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