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

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

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Feeds blow by gases to the exhaust manifold
Promotes combustion by creating a swirling movement in the air-fuel mixture
Returns blow by gases from the crankcase to the intake system
Mixes fuel with air

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

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

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