Automobile Engineering in ME
The path taken by intake air is

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

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Automobile Engineering in ME
The crankcase dilution means

Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of mixture passing through crankcase in two stroke engines
Dilution of oil by water in the crankcase
Dilution of fuel in the crankcase

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

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

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