What type of lubrication system is typically used in two-stroke engines?

In two-stroke engines, a mist lubrication system is commonly employed. This type of lubrication is distinct because it blends oil directly with the fuel. When the fuel-air mixture enters the combustion chamber, the oil is atomized and then burnt along with the fuel. This process ensures that the internal components of the engine receive lubrication during operation without the need for a separate oil reservoir.

The advantage of the mist lubrication system in two-stroke engines lies in its simplicity and compact design, as these engines often need to be lightweight and efficient. By using the fuel-oil mixture, maintenance is simplified, and oil is delivered to the engine components with each cycle.

In contrast, forced lubrication systems typically involve a complex network of pumps and channels, which is not necessary for the design and operation of a two-stroke engine. The wet sump system stores oil in the engine’s oil pan and pumps it through, but this is more suited to four-stroke engines due to their different operating principles. Meanwhile, the dry sump system utilizes an external tank and is not as commonly found in two-stroke engines, as it adds unnecessary complexity to a design that benefits from efficiency and minimal weight. Therefore, the mist system is the ideal choice for two-stroke engines due to