Two-Stroke Engine

A two-stroke engine is an internal combustion engine that completes a power cycle in just two piston movements — one up and one down — during a single revolution of the crankshaft. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke occur simultaneously, with the intake and exhaust processes also happening at the same time. Two-stroke engines offer several advantages, which include simple construction, higher power output, lighter weight, and lower manufacturing costs. However, they typically have shorter lifespans than four-stroke engines. Two-stroke engines require a mix of oil with fuel to lubricate the crankshaft, connecting rod and cylinder walls, which increases operational costs. These engine types are also less fuel-efficient, consume more fuel, and produce higher levels of pollution. Gasoline-powered two-stroke engines are commonly used in lightweight and portable applications, such as chainsaws and motorcycles. Larger applications, such as marine propulsion, railway locomotives and electricity generation, use compression-ignition two-stroke engines. ## Keywords stroke petrol bearings gasoline two-stroke combustion engine piston