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

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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Delivers improved cornering on dry road surfaces

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