Definition of Dwell Angle, Spark Angle, Firing order and Heat Path/spark plug reach

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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