The intake valve is typically located at the top of the cylinder, while the exhaust valve is typically located at the bottom. The intake valve is usually larger than the exhaust valve, as it needs to allow more air and fuel to enter the cylinder.
The intake and exhaust valves are opened and closed by the camshaft, which is a rotating shaft that is driven by the timing belt or chain. The camshaft has a series of lobes, which are raised areas that push on the valve stems to open the valves.
When the piston is moving down the cylinder, the intake valve opens to allow air and fuel to enter the cylinder. When the piston is moving up the cylinder, the exhaust valve opens to allow exhaust gases to leave the cylinder.
The timing of the intake and exhaust valves is critical to the proper operation of the engine. If the valves are opened or closed at the wrong time, the engine will not run properly.
