What are the two types of lubrication systems used in engines?

The two primary types of lubrication systems used in engines are pressure lubricated and splash lubrication systems.

Pressure lubrication systems work by using an oil pump to circulate oil under pressure throughout the engine components. This ensures a consistent supply of lubricant to critical areas, reducing friction and wear. The pumped oil can reach parts that are not easily accessible through gravity alone, such as the crankshaft and bearings, providing efficient lubrication under varying operating conditions.

Splash lubrication systems, on the other hand, rely on the motion of engine parts to distribute oil. In these systems, oil splashes from a reservoir and coats moving components as they operate, relying on the centrifugal force generated by the movement to ensure that lubrication reaches the necessary areas. This system is simpler and often used in smaller engines where high operating pressures are not required.

While the other options mention various lubrication methods and systems, they do not accurately reflect the standard types used in engine lubrication. Understanding the distinct functions and applications of pressure and splash lubrication is crucial for recognizing how engines maintain performance and longevity through effective lubrication.