Automobile Engineering in ME
The main function of an exhaust muffler is the

Optimization of exhaust efficiency
Reduction of the exhaust gas volume
Reduction of nitrogen oxide in the exhaust gases
Reduction of exhaust noise

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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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