overheadvalve

An overhead valve is a type of valve used in internal combustion engines, particularly in four-stroke engines. It is positioned above the combustion chamber, allowing for a more efficient and compact engine design. Overhead valves are typically actuated by a camshaft located above the cylinder head, which opens and closes the valves in synchronization with the engine's operating cycle.

The primary advantage of overhead valves is their ability to provide a larger valve area compared to side-valve engines, which improves engine performance and efficiency. This larger valve area allows for better airflow into and out of the combustion chamber, enhancing the engine's power output and fuel economy. Additionally, overhead valves can be designed with a higher lift, further improving airflow and performance.

However, overhead valves also have some drawbacks. The camshaft and associated components add complexity and weight to the engine, which can negatively impact performance and fuel efficiency. Furthermore, the overhead design can be more susceptible to wear and tear, as the valves and their associated components are exposed to more extreme temperatures and pressures.

Overhead valves are commonly used in various types of internal combustion engines, including those found in automobiles, motorcycles, and aircraft. They are particularly well-suited for high-performance applications, where their ability to provide a larger valve area and higher lift is advantageous. Despite their drawbacks, overhead valves remain a popular choice for many engine designers due to their performance benefits.