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

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

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

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

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