After a period of operation, the fuel system will form a certain amount of sediment. Any engine may produce carbon accumulation. The light of carbon accumulation will not affect the normal operation of the engine, but it will seriously lead to engine power reduction, increase fuel consumption and exhaust pollutant emissions and a series of problems. So how to prevent carbon deposition, how to clean it?
Various structures of the combustion chamber in the cylinder are the main parts of carbon deposition, including the top of the piston, spark plug, fuel injector, intake and exhaust valve, and the cylinder inlet of the intake pipe.
The main reasons for the power reduction are: the carbon accumulation of spark plug reduces the ignition ability or ignition failure, the leakage of pressure drop cylinder (valve and piston), etc., which is more obvious or low speed under the condition of large load.
The drop in electricity is accompanied by a certain increase in fuel consumption, as greater throttle opening and more fuel supply are needed to achieve the same electricity as before the carbon shock. Therefore, it is necessary to check whether there is carbon accumulation in the cylinder to find out whether the fuel consumption increases without reason.
The increase in emissions is usually found in annual car inspections. At present, only carbon monoxide, hydrocarbons and nitrogen oxides are detected. When carbon deposits, all three indicators may rise or exceed the limit. The change could come before electricity declines and oil consumption increases.
It is easy to form carbon deposit on the head of spark plug in combustion chamber. Remove the spark plug and observe whether there is carbon deposition and carbon deposition level in the electrode section. In case of direct injection engine, the nozzle can also be removed for inspection.
一般需要在行驶5000公里时更换机油。油的发黑主要是由活塞不断向下悬挂在气缸壁上的碳颗粒溶解而形成的，所以观察油的颜色也可以确定碳的积累。如果8000公里内机油颜色不太深(黑色)，说明发动机不容易积炭，则将换油时间延长至8000 - 10000公里。我在10000英里(更多的城市英里)和15000英里(更多的英里)之间换油。
Generally, it is necessary to change the oil when driving 5000 km. The blackening of the oil is mainly caused by the dissolution of carbon particles that the piston constantly hangs down on the cylinder wall, so observing the color of the oil can also determine the carbon accumulation. If the oil color is not too dark (black) within 8000 km, it means that the engine is not easy to accumulate carbon, then the oil change time will be extended to 8000 - 10000 km. I change between 10000 miles (more city miles) and 15000 miles (more miles).
I don't know if there is such a special carbon deposition detection device. In fact, the pinhole camera installed on the bracket can see the combustion chamber through the spark plug hole. The endoscope can directly check the whole combustion chamber and cylinder without disassembling the engine and removing the carbon deposit in time. This method is used to check the combustion chamber on a regular basis who wants to be a car maintenance driver. It is not only simple, but also can quickly remove less carbon deposit without removing the engine, thus avoiding the adverse consequences.
In a typical car repair shop, the carbon deposits in the cylinder head can be cleaned and removed without removing the engine.
Gasoline cleaners purchased at gas stations claim to remove impurities from the fuel lines and store carbon at the nozzles. There are different views on the effect of this approach and whether it will have other consequences. It is suggested that professional departments should carry out corresponding experimental research.
During engine overhaul, the carbon on the parts can be removed by cleaning agent, ultrasonic and other methods. The advantage is that the cleaning and carbon deposition are thorough and thorough. The disadvantage is that the engine needs to be disassembled, which takes a long time and may be missed during reassembly. If you are not sure whether the engine has obvious carbon deposit, do not do so easily.
The right way to start a car is often to maintain the engine, which can reduce the formation of engine carbon. When driving, you must take good care of your vehicle. If you are in a bad environment for a long time, it will only cause the vehicle to go on the road ahead of time.