How does a four-stroke engine lubricate its components?

A four-stroke engine lubricates its components primarily through the use of oil contained in the crankcase. In this system, oil is stored in the crankcase and circulated throughout the engine as needed. The oil pumps work to ensure that enough lubrication reaches critical components such as the crankshaft, camshaft, and valve train, effectively minimizing friction and wear during operation.

This design is efficient because it allows for a continuous supply of oil, ensuring consistent lubrication under various operating conditions. As the piston moves down during the intake stroke, it creates suction that helps draw oil through the engine’s lubrication system. The oil then returns back to the crankcase after lubricating the engine parts, completing the cycle and maintaining adequate levels of lubrication.

Other methods of lubrication, such as mixing oil with the fuel or using a reservoir to drip oil, are not used in four-stroke engines and are more characteristic of two-stroke engines or other applications. The four-stroke engine’s design emphasizes optimal oil use from a dedicated crankcase to ensure reliability and performance.