Here's why:
* Intake Valve: This valve allows air (or a mixture of air and fuel) to enter the cylinder during the intake stroke.
* Exhaust Valve: This valve allows exhaust gases to escape from the cylinder during the exhaust stroke.
While two valves per cylinder are common, some engines may have more, such as:
* Three valves per cylinder: This configuration is less common but can offer advantages like better airflow and increased power output.
* Four valves per cylinder: This is usually found in high-performance engines for better breathing and more efficient combustion.
Ultimately, the number of valves per cylinder is determined by the engine's design and the desired performance characteristics.
