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The difference between the two-stroke and four stroke of a lawn mower

The main differences between two-stroke and four-stroke hay mowers lie in their working principle, performance, price, environmental friendliness, and maintenance requirements.

Working principle and performance: In one working cycle, the two-stroke lawn mower moves the piston up and down for two strokes, completing four processes: intake, compression, combustion, and exhaust. The crankshaft only needs to rotate half a circle. In each working cycle, the piston of a four stroke lawn mower needs to complete four strokes, namely intake, compression, expansion work, and exhaust, corresponding to two rotations of the crankshaft. In theory, a two-stroke engine has a higher power output frequency and a higher power density, while a four stroke engine has a relatively higher energy conversion efficiency for a single stroke of work.

Price and Volume: Four stroke lawn mowers are usually structurally complex, expensive, and have a larger volume, while two-stroke lawn mowers have a compact structure and are more affordable.

Fuel economy and environmental friendliness: Four stroke lawn mowers are known for their smooth operation and fuel efficiency, while two-stroke lawn mowers are not as fuel-efficient as four stroke engines, and due to the higher cost of lubricating oil compared to 4-stroke engines, two-stroke engines are also less environmentally friendly.

Maintenance requirements: A two-stroke lawn mower does not require frequent oil changes like a four stroke lawn mower, reducing maintenance hassle. However, the four stroke lawn mower has a more refined management of oil and gasoline, usually requiring separate storage of gasoline and oil, and regular oil changes to maintain normal machine operation.

In summary, the two-stroke lawn mower is suitable for users who do not use it frequently or do not need to use it for a long time. It has a high power density and a compact structure, but poor fuel economy and environmental protection. The four stroke lawn mower is suitable for users who require long-term use or have higher performance requirements, with better fuel economy, stability, and environmental friendliness, but with higher prices and maintenance costs.