intakeplenum

An intake plenum is a component found in internal combustion engines and other machinery that serves as a distribution manifold for incoming air or fuel-air mixture. Its primary function is to ensure that each cylinder or intake port receives an equal and consistent supply of the charge. This uniformity is crucial for optimal engine performance, fuel efficiency, and emissions control.

The intake plenum is typically located between the throttle body or carburetor and the individual intake ports of the engine. It often has a larger volume than the individual intake runners, allowing for a reservoir of air or mixture to be stored. This storage helps to smooth out pulsations in airflow that occur as the engine's intake valves open and close, leading to a more stable and consistent supply to each cylinder.

The design of an intake plenum can vary significantly depending on the engine's configuration and intended application. Some plenums are relatively simple, while others incorporate complex internal structures and runners designed to optimize airflow characteristics. Materials used in construction can include cast aluminum, plastic, or composite materials. Variable intake plenums are also employed in some engines, where their length or volume can be adjusted to alter the engine's torque curve and power output across different RPM ranges.