Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression
Ignition of the charge before the passage of flame front
Ignition induced by the passage of a spark
Ignition induced to supplement the process of normal combustion

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation
Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons
Adjusts the timing of the intake and exhaust valve openings

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