Dwell angle: It is the amount of time in degrees that contact point remain closed between each opening is called dwell angle. Spark angle: Spark plug is a device which device electric current from ignition system to combust on chamber of a S.I engine to ignite the compressed air fuel mixture in the form of spark at the end of compression stroke. Heat path/spark plug reach: Heat range is cylinder to heat combustion chamber. Firing order: Firing order is defined as the order on sequence in which firing takes place in every cylinder of a multi-cylinder engine.
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