Automobile Engineering in ME
The stroke of an engine is the

Volume of the cylinder
Distance between T.D.C. and B.D.C.
Internal diameter of the cylinder
Length of the connecting rod

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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
Increase inertia force of the rotating crankshaft
Reduce vibrations caused by the crankshaft rotation
Adjusts the timing of the intake and exhaust valve openings

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