What Does Single-Cylinder Four-Stroke Mean?
1 Answers
Single-cylinder four-stroke refers to the intake stroke, compression stroke, power stroke, and exhaust stroke, replacing the single-cylinder two-stroke. Below are the differences between single-cylinder four-stroke and two-stroke engines: 1. Structure: The two-stroke engine has a relatively simpler structure, mainly consisting of components such as the cylinder head, cylinder, piston, and piston rings. The cylinder body is equipped with intake ports, exhaust ports, and scavenging ports, whose opening and closing are determined by the piston's position. Compared to four-stroke engines, two-stroke engines lack complex valve mechanisms and lubrication systems, and generally use air cooling, greatly simplifying the structure. 2. Performance: The two-stroke engine performs twice as many power strokes per unit time as the four-stroke engine. Theoretically, the power of a two-stroke engine should be twice that of a four-stroke engine (though in practice it is only 1.5~1.7 times). The engine's specific power is higher, its dynamic performance is better, and its vibration is relatively lower. Additionally, two-stroke engines are lighter, cheaper to manufacture, have lower failure rates, are easier to maintain, and are more convenient and flexible to use. 3. Comprehensive Aspects: Four-stroke engines are more widely used, with the majority of cars and construction machinery equipped with them. Two-stroke engines are more commonly used in applications where they are not frequently used or where the "power-to-weight ratio" is crucial, such as lawn mowers, chainsaws, model aircraft, agricultural machinery, etc. They are also widely used in some small motorcycles and off-road motorcycles that prioritize dynamic performance. Additionally, tanks, ships, and heavy transport vehicles, which require high engine power while also demanding lightweight and compact engines, often opt for two-stroke engines.
