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What should I do if I encounter unexpected problems in the combustion process of the chain saw engine?

Updated:02-03-2021
Summary:

Chain saw is a kind of garden machinery widely used in […]

Chain saw is a kind of garden machinery widely used in mechanized logging operations in my country's forest areas, and the chain saw engine is also called an internal combustion engine or a gasoline engine. It is the main part of the chain saw power, used to generate power, through the transmission mechanism to drive the sawing mechanism for sawing. The chain saw engine is different from the engines commonly used on tractors. The power of the chain saw is twice the power of a two-stroke engine than a four-stroke engine. The chain saw engine may encounter some problems during the combustion process. Today, I will mainly talk about two problems encountered by the chain saw engine during the combustion process.

 

 

 

1. After the engine is ignited, deflagration sometimes occurs
After the engine is ignited, deflagration occurs, which is an abnormal combustion. When the engine deflates, the flame burning speed is extremely fast, which can reach 2000-3000 m/s, while the normal flame burning speed is 20-40 m/s. Therefore, the temperature of the engine has increased significantly, and the pressure of the cylinder has also increased significantly. The characteristic of deflagration is the sound of metal knocking in the cylinder, the engine is unstable, overheated, and the power is reduced, and black smoke is emitted from the exhaust pipe. Due to the detonation of the engine, its economy deteriorates, the lubricating oil deteriorates, and even loses its lubricating performance, which increases the wear of the bearing. Therefore, deflagration is not allowed. The main reason for engine explosion is due to poor fuel quality or improper combination of fuel brand and engine compression ratio. In addition, it is also related to the temperature of the engine itself, the position of the spark plug, the form of the combustion chamber, and the size of the pre-ignition angle, and carbon deposits can also ignite and deflagrate. After deflagration occurs, immediately close the throttle valve (throttle), find out the cause, and eliminate it.

2. Pre-ignition
Pre-ignition means that the combustible mixture in the cylinder burns by itself without waiting for ignition. The reason for pre-ignition is that the temperature in the cylinder has reached the auto-ignition temperature of the fuel during the compression process, so it burns itself without ignition. When pre-ignition occurs, the engine is overheated, a lot of carbon deposits are generated, and the engine is unbalanced. Earlier we talked about what to do when the engine is overheated and carbon deposits occur. You can follow us Hangzhou Longer Sawchain Co., LTD to check.
By analyzing and understanding the two problems of the engine in the combustion process, we can quickly understand the performance of the chain saw. Only when the machine performance is known and mastered, can the work efficiency and quality be improved, so as to truly achieve the purpose of saving labor and reducing costs. Welcome everyone to inquire Hangzhou Longer Sawchain Co.,LTD.

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