Two-Stroke Engine

A two-stroke is an internal combustion engine which completes a power cycle with two (up and down) movements of the piston during only one crankshaft revolution. In a two-cycle engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust occurring at the same time. Advantages of two-stroke engines are a simple construction, a significant power boost, less weight and cost to manufacture. However, this type of engines doesn't live as long as four-stroke engines. Two-stroke engines require a mix of oil in with the gas to lubricate the crankshaft, connecting rod and cylinder walls. The price of using a two-stroke engine is increased by using two-stroke oil. The fuel efficiency of a two-stroke engine is not enough. They have high fuel consumption. These engines also produce more pollution. Gasoline versions are useful in lightweight or portable applications such as chainsaws and motorcycles. Compression-ignition engines are used in large applications, such as marine propulsion, railway locomotives and electricity generation.

## Keywords
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