Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders

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

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

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