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

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

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Creates swirl
Increases the combustion temperature
Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

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