A motorcycle's cylinder is the heart of the engine,

Every motorcycle rider wants his or her car,

The longer the service life, the better,

This extends the service life of the cylinder,

Is of great significance,

Acquire some necessary knowledge,

Avoid cylinder damage as much as possible,

Is a lot of motorcycle friends need to have.

1 Choosing a brand or genuine car is the key

The cylinder is the track of the piston movement, and the piston equipped with the piston ring moves in the inner wall of the cylinder at a high speed of 10 ~ 21m/s (two-stroke machine) or 15 ~ 22m/s (four-stroke machine). To seal the high pressure gas pressure of 0.5 ~ 1.15MPa (two punch machine) or 0.8 ~ 1.3MPa (four punch machine); But also to withstand the frequent alternating changes of 500 ~ 2000℃ high temperature; The lubrication condition is poor, the exhaust gas after combustion has a corrosive effect, and the working environment is very bad. Therefore, the cylinder material and processing accuracy requirements are very high. The cylinder of the domestic genuine motorcycle is generally made of C 3% ~ 3.2%, Cr 0.3% ~ 0.45%, Mn 0.6% ~ 0.8%, Cu 2%, P 0.4% ~ 0.6%, S0.1% special alloy cast iron.

The hardness should reach HB220 ~ 250, the roughness should reach the mirror degree of 0.1 ~ 0.2μm, the machining accuracy of the cylinder diameter should reach 0.005mm, and the roundness and taper should reach the range of 0.01mm. Any one of the technical indicators does not meet the requirements, will greatly shorten the service life of the cylinder. This shows how important it is to buy a brand or genuine motorcycle.

One of the main reasons for the service life of foreign high-performance engines up to 100,000 ~ 150000km is that the inner wall of the cylinder is plated with a layer of high-performance ceramic composite materials. In recent years, China's Qomolangma Company and Chongqing Huawei Company have also begun to apply new cylinder ceramic coating technology.

For example, Chongqing Huawei's "Jintao technology" is to use chemical vapor deposition technology to deposit a layer of Ni-SiC composite ceramic film on the inner wall of the cylinder, and the diameter of the ceramic particles penetrating into the inner wall of the cylinder is only 0.3μm, the structure is dense, the surface roughness is high, and the friction coefficient is only 0.06 ~ 0.082.

The coating has high temperature resistance, corrosion resistance, self-lubrication, high strength, high wear resistance and other comprehensive properties. After the test, the wear amount of the cylinder within 200000km is less than 0.10mm, and the gap of the cylinder can be reduced to 0.015 ~ 0.025mm, without worrying about cylinder expansion, cylinder pulling and air leakage, reaching the international advanced level.

Motorcycle enthusiasts if they can buy this kind of cylinder car is the most ideal.

2 The new car should be well run in

Although the inner surface of the cylinder block is very bright when it is produced from the manufacturer, it is still uneven from the microscopic point of view, and the difference between the convex and convex is still 0.1-0.2μm, and the raised part is vulnerable to damage. If the larger load is borne at this time, it will cause strain on the inner surface of the cylinder block. Therefore, during the running-in period of the new car, it must be light load, and after the raised part is smoothed, the inner surface of the cylinder block can withstand a large load. In this way, the service life of the inner surface of the cylinder will be extended. The practice of many scientists and users has proved that the relative life of the run-in cylinder is much longer than that of the unrun-in cylinder.

When the motorcycle leaves the factory, the manufacturer requires the user to run in the new car, and the running-in period is generally between 1500 and 2500km. In order to ensure the quality of running-in, some manufacturers add speed limit tubes at the throat of the motorcycle carburetor, so that the speed of the new car is lower than the speed of normal use. During the run-in period, the user must not remove the speed limit tube at will; It is strictly prohibited to drive at high speed or low speed; It is best not to carry people and no cargo; As far as possible, avoid driving on the bad road surface with potholes, so as not to bear a large load. For two-stroke motorcycles using mixed oil, the mixture ratio of gasoline and lubricating oil should be increased to about 20∶1, so that it is conducive to the run-in of the cylinder surface.

3 The surface of the cylinder body should be well lubricated

The piston movement speed of modern motorcycle engines is so high that even the loss of lubrication in a short period of time may cause severe wear and even destruction of the inner surface of the cylinder. In order to avoid dry friction, be sure to ensure that the engine is in good lubrication when running.

On the one hand, always check the oil pressure and oil scale to avoid using the motorcycle in the absence of lubricating oil; On the other hand, it should be noted that the lubricating oil should have the appropriate viscosity, so that it can adhere to the surface of the cylinder and piston well, in order to form liquid friction. The viscosity of lubricating oil is related to temperature, and different viscosity lubricating oil should be used in different seasons.

According to the API international standard classification, the summer should use SD grade SAE10W-40 lubricating oil; Use SD-grade SAE10W-30 lubricating oil in winter. According to the national standard of our country, the winter uses 6 gasoline engine oil, spring, autumn is 10, and summer is 15.

4 The air entering the cylinder should be clean

The air entering the cylinder from the air filter, if it contains more dust or tiny sand particles, will rapidly increase the wear of the inner surface of the cylinder like abrasive, so be sure to make the air entering the cylinder very clean. On the one hand, the dust in the air filter should be removed regularly (about 1000km), and the filter core should be replaced if necessary; On the other hand, it is necessary to regularly check the sealing of the joint of the air filter to avoid unclean air entering the cylinder without the filter heart. In order to improve the filtration effect, the paper core filter can add a thin layer of foam sponge outside the filter core, and the foam sponge must be cleaned with water once a day to avoid blocking.

It has high temperature resistance, corrosion resistance, self-lubrication, high strength, high wear resistance and other comprehensive properties. After the test, the wear amount of the cylinder within 200000km is less than 0.10mm, and the gap of the cylinder can be reduced to 0.015 ~ 0.025mm, without worrying about cylinder expansion, cylinder pulling and air leakage, reaching the international advanced level. Motorcycle enthusiasts if they can buy this kind of cylinder car is the most ideal.

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