It’s the camshaft lobe’s profile that’s in charge of all this. In practice, the intake valve will actually remain open a little longer, especially as the vehicle’s speed increases. This piston pushing up forces the gases out, and the valve closes as the piston reaches the top. When the piston is on its combustion stroke, the exhaust valve opens and the piston hits the bottom of the stroke. The lobe starts to open the intake valve as the piston begins its downward intake stroke and then closes when the piston is at the bottom of that stroke. The shape of the lobes is important, as it can affect the engine performance at different speeds. These are what govern the valves opening and closing on the cylinder. Protruding from the camshaft are small pieces called lobes. The camshaft spins with the car’s crankshaft.
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