The so-called 'carbon accumulation' is the product generated inside the engine left by the engine when it is working for a long time, such as oil, dust, and debris. It is commonly called ‘sludge,’ and the sludge in the cylinder is generally called “carbon deposit”. In the normal operation of the engine, the gasoline and the engine oil that normally enters the combustion chamber cannot be completely burned in the cylinder under the condition of insufficient oxygen supply, and the particles of the soot and the lubricating oil are burned. When the engine continues to run. It is further oxidized to a gel and firmly adheres to the top of the piston and the piston ring, as well as the back of the valve, the inner surface of the intake pipe, the throttle body and the combustion chamber. Under the repeated action of high temperature, the gum is changed into asphaltene, resinous and carbonaceous, thereby forming carbon deposits.
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