What is the main reason for significant lateral wear in cylinders?
1 Answers
The main reasons for significant lateral wear in cylinders are as follows: Influence of working gas pressure: Due to the clearance between the piston ring and the ring groove, high-pressure gas generated during operation enters behind the piston ring through this gap, pressing the ring against the cylinder wall. The first ring bears the highest gas pressure, resulting in the most severe wear at the upper part of the cylinder. Influence of working temperature: During normal operation, the upper part of the cylinder has the highest temperature. The viscosity of the lubricating oil decreases as the temperature rises, leading to poorer lubrication conditions and the greatest wear at the upper part of the cylinder. For the entire engine, if the working temperature is too high, the viscosity of the lubricating oil will decrease, accelerating wear. If the working temperature is too low, the fluidity of the lubricating oil during cold starts is poor, and gasoline evaporation is insufficient. Gasoline can also wash the cylinder wall, further deteriorating lubrication conditions and increasing cylinder wear. Influence of corrosive substances: The engine is affected by corrosive substances in combustion products, including oxides of carbon, sulfur, and nitrogen, as well as water vapor and organic acids. These substances sometimes directly react with the cylinder wall or dissolve in water to form acids. The lower the temperature, the more easily acidic substances are produced, increasing the corrosive effect.