How To Prolong The Service Life Of Motorcycle Cylinder？

The service life of a motorcycle is calculated by the mileage of its overhaul.

The main symbol of overhaul mileage is the wear of cylinder diameter and crankshaft, of which the wear of cylinder diameter is the most important.

When the cylinder diameter wear, the gap between the piston and the inner wall of the cylinder increases, causing the piston and the inner wall of the cylinder between the knock sound and leakage.

At this time, motorcycle fuel consumption rose sharply, greatly increased sewage, mechanical efficiency and power sharply decreased, must be overhauled.

The main project of overhaul is to keep out the cylinder, replace the piston, and restore the normal gap between the piston and the inner wall of the cylinder.

The cylinder clearance of domestic motorcycle is generally 0.03 ~ 0.06mm (refers to the gap value between the piston skirt and the cylinder block), and the cylinder clearance of foreign high-performance engines can be as small as 0.015 ~ 0.025mm.

It can be seen that the wear of the cylinder diameter directly determines the service life and overhaul period of the motorcycle.

Needless to say, how to prolong the service life of the cylinder has very important practical significance, it is related to the vital interests of every car owner.

Therefore, it is necessary to introduce some corresponding measures to avoid the wear of cylinder diameter and prolong its service life.

First, the key is to buy a famous brand or a genuine car:

Cylinder is the track of piston movement, equipped with piston ring piston in the cylinder wall with 10 ~ 21m/s (two stroke machine) or 15 ~ 22m/s (four stroke machine) high-speed reciprocating linear motion;

To seal 0.5 ~ 1.15mpa (two punching machine) or 0.8 ~ 1.3mpa (four punching machine) high pressure gas pressure;

It also bears frequent alternation of 500 ~ 2000℃ high temperature;

The lubrication condition is poor, the exhaust gas after combustion has corrosion effect, and the working environment is very bad.

Therefore, the material and machining accuracy of the cylinder is very high.

The cylinder of domestic genuine motorcycle is generally made of special alloy cast iron of C 3% ~ 3.2%, Cr 0.3% ~ 0.45%, Mn 0.6% ~ 0.8%, Cu 2%, P 0.4% ~ 0.6% and S0.1%.

Its hardness to reach HB220 ~ 250, roughness to reach 0.1 ~ 0.2μm mirror degree, cylinder diameter machining accuracy to reach 0.005mm, roundness and taper to reach the range of 0.01mm.

Any one of the technical indicators can not meet the requirements, will greatly shorten the service life of the cylinder.

This shows, famous brand of choose and buy or genuine motorcycle is how important.

Two, the new car should go through good running-in:

Although the inner surface of the cylinder block from the manufacturer is very bright, but from the microscopic point of view is still uneven, the difference between the concave and convex is still 0.1 ~ 0.2μm, the convex part is vulnerable to damage.

If bear larger load at this time, will cause the cylinder inner surface of the strain.

So in the new car run-in period, must be light load, to be raised part of the ground, the inner surface of the cylinder can withstand a large load.

This will prolong the service life of the inner surface of the cylinder block.

The practice that many scientists and user prove: run in good cylinder body compares not run in the cylinder body relative life wants long much.

When the motorcycle leaves the factory, the factory requires users to run in the new car, run in period is generally between 1500 ~ 2500km.

In order to ensure the running in quality, some factory side in the motorcycle carburetor throat tube with speed limit tube, so that the speed of the new car is lower than the speed of normal use.

In the running-in period, the user must not remove the speed limit pipe at will;

Prohibit high gear low speed or low gear high speed driving;

It is best not to carry people;

As far as possible to avoid driving on the bumpy bad road surface, so as not to bear a larger load.

For two-stroke motorcycles using mixed oil, the mixing ratio of gasoline to lubricating oil should be increased to about 20∶1 to make it conducive to the surface of the cylinder block.

Three, the surface of the cylinder block should have good lubrication:

The pistons of modern motorcycle engines move at such a high speed that the loss of lubrication in even a short period of time can cause severe wear and even destruction of the inner surface of the cylinder.

To avoid dry friction, make sure the engine is well lubricated when running.

On the one hand, to often check the oil pressure and oil scale, to avoid the use of motorcycles in the absence of lubricating oil;

On the other hand, we should pay attention to the proper viscosity of lubricating oil, so that it can adhere to the cylinder block and the piston surface, so as to form liquid friction.

The viscosity of lubricating oil and temperature related, different seasons should use different viscosity of lubricating oil.

According to API international standard classification, API classification specifications are SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM and SN, each incremental letter, the performance of the oil will be better than the previous one, the oil has additives used to protect the engine, the higher the letter, the higher the quality grade.

Four, the air into the cylinder to clean:

From the air filter into the cylinder of the air, if it contains more dust or tiny sand, it will quickly increase the wear of the inner surface of the cylinder like abrasive, so be sure to let the air into the cylinder is 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 when necessary;

On the other hand, the sealing situation at the joint of the air filter should be checked frequently to avoid unclean air entering the cylinder without filtering center.

In order to improve the filtering effect, a thin layer of foam sponge can be added to the filter core of the paper core air filter. The foam sponge must be cleaned with water once a day to avoid blocking.

Five, other problems that cannot be ignored:

1. The use of gasoline grade to match the compression ratio of the engine, that is, must be fueled with motorcycle manufacturers specified grades of gasoline

2. Change gear in time to avoid stalling.

If in stall circumstances suddenly increase the throttle, will cause the piston and cylinder wall impact, damage the cylinder surface, should be promptly changed into low gear, and then gradually accelerate.

3. Avoid driving under heavy load for a long time.

If the motorcycle is in a climbing state for a long time or because of poor road conditions, it can not drive at a medium speed. It should be shut down at a regular time for cooling, so as not to overheat the engine.

4.The specified grade of genuine lubricating oil should be selected, and the use of deteriorated oil is prohibited, and water, gasoline and other impurities in the oil box are prohibited;

Also pay attention to the regular replacement of lubricating oil.

After a period of time, this is because the lubrication wear debris produced by friction between the moving parts and external impurities (including mixed with solid and liquid), and lubricating oil produced by some chemical change itself, can make lubricating oil turbidity metamorphism and lose lubrication, in particular, often in contrast more rural and pastoral areas roads, to increase the number of oil change

5. Avoid cold cars.

When using the car in winter, the lubricating oil is in a condensing state and cannot play a lubricating role, so it must be preheated.

The way to warm up is to let the engine run at idle for a few more minutes and wait for the temperature to rise and the oil to take effect before starting.