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

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

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