What are the factors that affect the service life of a car engine?

10 Feb.,2022

The principle of automobile engine and the factors that affect the life of the engine are generally installed on the carburetor with a speed limiter. If the speed limiter is removed prematurely, it will cause abnormal noise, oil leakage, air leakage and power drop of the engine prematurely, which will shorten the service life of the engine.

 

The principle of automobile engine and the factors that affect the life of the engine are generally installed on the carburetor with a speed limiter. If the speed limiter is removed prematurely, it will cause abnormal noise, oil leakage, air leakage and power drop of the engine prematurely, which will shorten the service life of the engine.

  1. Selection of fuel oil and lubricating oil: The selection of fuel oil must conform to the grades stipulated by the vehicle. It is forbidden to use low grade fuel oil, otherwise the engine will produce knocking during operation, which will cause strong impact on the parts and additional load on the parts. increase, thereby accelerating the wear of the parts. The high temperature, high pressure and shock wave generated by knocking will also destroy the lubricating oil film on the cylinder wall and deteriorate the lubrication of the parts. Tests show that an engine with and without knocking works for 200 hours, and the average wear amount of the upper cylinder with knocking is more than twice that without knocking. In addition, fuel with excessive impurities will also accelerate the wear and corrosion of parts. The selection of lubricating oil should also meet the working needs of the engine. If the viscosity of the engine lubricating oil is low, the pressure of the lubricating oil will be low, and an oil film cannot be formed, resulting in boundary friction or dry friction; if the viscosity of the lubricating oil is too large, the fluidity will be poor. It is not conducive to cold starting, and it takes a long time for the lubricating oil to pass through the oil filter to reach the lubricating part, which increases the starting wear. The filling of lubricating oil should be appropriate. When the oil level is too high, it will not only increase the movement resistance and reduce the power, but also cause the lubricating oil to enter the cylinder and burn, resulting in excessive carbon deposits; and when the lubricating oil is too low, the oil pressure will be low, It is difficult to form an oil film, and it will cause dry friction or boundary friction, increase wear, abnormal noise in bearings, and even serious accidents such as cylinder pulling and tile burning.

      2. Cold start and cooling water temperature: When starting the vehicle from cold, especially in winter, you should try to use preheating measures or cold shake and slow rotation to heat up at a low speed, and it is forbidden to slam the accelerator. Because the viscosity of the lubricating oil is higher when the engine is cold started, it takes a longer time to reach the lubricating part. Some data prove that when the temperature is -15 ℃, the lubricating oil can flow to the connecting rod bearing and the motion pair on the cylinder head after 2 minutes of starting. During this period of time, if the accelerator is slammed, the engine speed will rise rapidly. , the parts that the lubricating oil does not reach form dry friction, which aggravates the wear. When the engine temperature is too high, the lubricating oil becomes thinner, and the lubricating oil film cannot be formed well, which will also increase the wear of the parts, and it is also easy to produce knocking. However, it is also not allowed to blindly remove the thermostat due to the high water temperature and make the engine work at low temperature for a long time, which will also cause excessive engine wear.

      3. Road: The quality of the road has a great influence on the performance of the vehicle speed, fuel consumption and wear. If the road is gravel or muddy, the driving resistance is constantly changing; when the resistance is large, the engine will work under heavy load. Under the working conditions, the pressure in the cylinder increases at this time, and the wear is aggravated.

      4. In winter, due to the low viscosity of lubricating oil, it is slow to enter the lubricating part, so that the dry friction time of the engine is long; in the hot summer, the parts of the car are in a hot state, and when the ambient temperature is 40 ℃, it will be serious. It affects the performance of electrical components and makes the ignition system unable to work normally; in addition, due to high temperature, the lubricating oil becomes thinner, and the oil film is difficult to form, which increases the tendency of the engine to dry friction.