Two-stroke cycle engine

A two-stroke cycle engine is an engine where it takes two piston strokes to complete one cycle, that is, to rotate the crankshaft once.
Mainly has the following features.
(1) Smooth rotation and high output: Since there are twice as many combustions as a four-stroke engine, rotation is smooth even when there are few cylinders, and two-stroke cycle engines generate greater output than four-stroke engines of the same displacement at the same rotational speeds.
(2) Inexpensive: Generally, as no valves are used, there are fewer parts, which reduces the number of failures and lowers costs.
(3) Incomplete exhaust: Since the time allowed for scavenging is half that of a four-stroke engine, exhaust tends to be incomplete, making it difficult to increase rotation.
(4) Low speed rotation is difficult: Although four-stroke engines are able rotate at low speeds because piston pumping action operates automatically on the intake stroke, since intake operates passively in two-stroke cycle engines, unevenness is likely to occur at low rotational speeds.
Furthermore, in the case of gasoline engines, there is a risk of blowback to the carburetor.
(5) Prone to overheating: Since exhaust ports, which are the components most likely to overheat, are located inside the cylinders, pistons and cylinders can overheat and impede proper lubrication.
Furthermore, these components will deform due to overheating, leaving piston rings prone to breakage and wear.

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