Explain why cycle-to-cycle variations in conventional diesel engines are relatively lower than the conventional spark ignition engines. Discuss the mechanism on how spark characteristics (spark plug...

Explain why cycle-to-cycle variations in conventional diesel engines are relatively lower than the conventional spark ignition engines.

Discuss the mechanism on how spark characteristics (spark plug gap vicinity,

electrode shape, spark plugs number, and location) affects the cycle-to-cycle

variations (CCV) in SI engine. Describe the stage of combustion (sparking and

flame initiation, initial flame kernel development, and turbulent flame propagation) most affected by each parameter. Explain how each parameter can be

adjusted to minimize the CCV in SI engine. Discuss the advantage in terms of

cyclic variations gained by advanced ignition systems such as laser ignition.