What is the working principle of a motorcycle engine?
2 Answers
Motorcycle engines are divided into two types: two-stroke engines and four-stroke engines. Below are the working principles of these two types of engines: 1. Working principle of a two-stroke engine: An engine where the crankshaft rotates once, the piston moves back and forth once in the cylinder, and completes a working cycle of intake (scavenging), compression, combustion expansion, and exhaust is called a two-stroke engine. 2. Working principle of a four-stroke engine: An engine where the crankshaft rotates twice, the piston moves back and forth twice in the cylinder, and completes four working cycles of intake (scavenging), compression, combustion expansion, and exhaust is called a four-stroke engine.
I've been riding motorcycles for many years, and the working principle of the engine is quite simple yet fascinating. When you press the start button or kick the pedal, the engine begins to intake—drawing a mixture of air and gasoline into the cylinder. Then the piston compresses the mixture upwards, which is called compression. Immediately after, the spark plug ignites, causing a 'small explosion' that forcefully pushes the piston down, rotating the connected crankshaft. This rotational force is transmitted through the gearbox to the chain or shaft, driving the rear wheel to turn. The final step is exhaust, expelling the waste gases from the cylinder. This entire process repeats in a cycle, generating continuous power. I think the hum of the engine is a manifestation of this rhythm. It's especially noticeable when riding uphill—you can feel the engine 'breathing' rapidly. For maintenance, I recommend regularly changing the oil and cleaning the air filter to prevent dirt from affecting performance, ensuring the engine runs smoother and lasts longer.
