poppetconstructie

Poppet construction is a type of internal combustion engine design where the intake and exhaust valves are operated by a poppet valve mechanism. This mechanism consists of a valve stem, a valve head, and a valve spring. The valve stem is connected to the valve head, which is held in place by the valve spring. When the engine's camshaft rotates, it pushes the valve stem up and down, opening and closing the intake and exhaust valves.

Poppet construction is commonly used in gasoline engines, particularly in cars and motorcycles. It is favored for its simplicity, reliability, and ability to provide a tight seal between the valve and the valve seat. The design allows for a large valve area, which can improve engine performance and fuel efficiency. However, it also has some drawbacks, such as the potential for valve float and the need for regular maintenance to replace worn valve seats.

In recent years, there has been a trend towards using poppetless valve mechanisms, such as overhead camshafts and direct-acting bucket valves, in some high-performance and racing engines. These designs offer advantages such as reduced weight, improved valve timing, and the ability to use larger valves. However, poppet construction remains the most common valve mechanism in internal combustion engines due to its proven reliability and simplicity.