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

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
Creates swirl
Increases the combustion temperature

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

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