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

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

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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
Delivers improved cornering on dry road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Eliminates the need of snow tyres, tyre chains, etc.

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