During the intake stroke, which component controls air entering the combustion chamber?

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Multiple Choice

During the intake stroke, which component controls air entering the combustion chamber?

The intake valve. During the intake stroke, the piston moving downward creates a drop in pressure that pulls air into the cylinder, but only if the intake valve is open. The intake valve opening from the intake manifold allows air (and sometimes fuel if the engine is a typical port-injected setup) to enter the combustion chamber. The exhaust valve stays closed to keep exhaust gases out, while the camshaft powers the timing to open and close the valves at the right moments. The piston’s movement drives the process, but the actual control of air entry is done by the intake valve.

The intake valve. During the intake stroke, the piston moving downward creates a drop in pressure that pulls air into the cylinder, but only if the intake valve is open. The intake valve opening from the intake manifold allows air (and sometimes fuel if the engine is a typical port-injected setup) to enter the combustion chamber. The exhaust valve stays closed to keep exhaust gases out, while the camshaft powers the timing to open and close the valves at the right moments. The piston’s movement drives the process, but the actual control of air entry is done by the intake valve.

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