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

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

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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms
The unsprung mass in lighter
The vertical size of the suspension can be made more compact

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