Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Reduce the resistance to sliding that occurs between the cam and the tappet
Make the crankshaft turn smoothly
Allow for lengthening of the valves owing to the heat of combustion
Increase the speed at which the valves move up and down

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

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

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

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

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