(1) After the engine is ignited, deflagration sometimes occurs, which is an abnormal combustion. When the engine detonates, the flame burning speed is particularly fast, which can reach 2000-3000 meters/second, while the normal flame burning speed is 20-40 meters/second. Therefore, the temperature of the engine increases significantly, and the pressure of the cylinder also increases very much. The characteristics of deflagration are the metal knocking sound in the cylinder, the unstable operation of the engine, overheating, at the same time the power drops, and the black smoke in the exhaust pipe. Due to the engine deflagration, its economy deteriorates, the lubricating oil deteriorates, and even its lubricating properties are lost, which increases the wear of the bearings. Therefore, deflagration is not allowed. The main cause of engine deflagration is due to poor fuel quality or improper coordination of fuel grade 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 advanced ignition angle. Also, carbon deposits can cause deflagration. After deflagration occurs, the throttle valve (throttle) should be closed immediately to find out the cause and eliminate it.
(2) Pre-ignition: that is, unequal ignition, the combustible mixture in the cylinder burns by itself. The reason why pre-ignition occurs is that the temperature in the cylinder has reached the temperature of fuel spontaneous combustion during compression. Therefore, it does not need to be ignited to burn itself. When pre-ignition occurs, the engine overheats, producing a lot of charcoal, and the engine works unbalanced. Kerip chainsaw
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By analyzing and understanding the two problems in the combustion process of the chain saw engine, we can better understand the performance of the chain saw. Only when the performance of the machine 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.
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