"All the liars who want you to clean up the carbon deposits are not effective at all!"
"It is necessary to clean up; the effect of cleaning up is not bad,"
"You don't need to go to clear it specifically; just run a high-speed pull."
There are various opinions on the issue of carbon deposits, and all car owners are a little at a loss. Today, let's talk about the daily formation and cleaning of carbon deposits so that you can understand the principles and basis of it so that you won't be confused anymore.
The first question: What is carbon accumulation?
Carbon and vinyl substances will accumulate in the intake and exhaust valves, intake pipes, combustion chambers, fuel injectors, etc., inside the engine. Scientifically speaking, it is a kind of coke-like substance produced by unsaturated olefins and gums in the fuel at high temperatures during the working process of the engine.
The second question: How is carbon deposit formed?
The carbon deposits in the combustion chamber are caused by the fact that the colloids in the gasoline components and the incompletely detonated hydrocarbons produced tiny carbon particles after the explosion failed to discharge with the exhaust gas and accumulated in the combustion chamber, mainly distributed in components such as fuel injectors, throttle valves, oil pipelines, spark plugs and so on.
The third question: What are the hazards of carbon deposits?
- It will increase the exhaust emissions and cause the engine performance to decline, and the annual audit may not be passed.
- The loss of carbon particles at the valve position may block the normal opening and closing of the valve, resulting in deformation of the valve stem, which may interfere with the movement of the camshaft and rocker arm upwards, causing greater losses.
- The existence of carbon deposits not only occupies a certain space but also easily forms hot spots at high temperatures (the temperature is easy to suddenly increase), which is easy to produce a second ignition point, causing pre-ignition and knocking off the gasoline engine, which affects the working performance and service life of the engine.
- Carbon deposition will accelerate the pollution and deterioration of lubricating oil and block the lubricating oil circuit, destroying the lubricating system.
The fourth question: How to judge whether carbon deposits should be cleared?
- The idling speed is above 900 revolutions for a long time, or the idling speed is unstable, high, and low.
- Cold start is more difficult.
- Fuel consumption increases when power drops.
- Exhaust gas exceeded the standard during the vehicle inspection.
The fifth question: How to clean up carbon deposits?
The usual cleaning of carbon deposits is the carbon deposits in the intake and exhaust valve chambers and intake ports.
- Use fuel additives.
Clean fuel additives can be used for the daily cleaning of carbon deposits. Long-term use of clean fuel additives, although not as thorough as advertised, still has a certain effect and will slow down the formation of carbon deposits, especially for non-direct injection models. But it still depends on the quality and performance of the cleaning agent used.
- Run at high speed.
In theory, running at high speed can use the high airflow generated at high speed to wash away part of the carbon deposits in the engine, but the actual effect is minimal, and it can only become sufficient relative to combustion, reducing the formation of carbon deposits, and alleviating the aggravation of carbon deposits. , There is no need to run high speed deliberately in order to clean up carbon deposits.
- Manual cleaning.
Manual cleaning is to uses sharp tools such as a knife to scrape the carbon deposits in the intake and exhaust valve and intake and exhaust valve chambers. It can also be cleaned up, but it will leave scratches on the cleaned parts, which may affect the engine.
- Washing of walnut sand
The raw material of walnut sand is walnut shell. After the walnut shell is crushed, it is made through strict screening and classification and multiple processes of refining. It has the advantages of high hardness, high pressure resistance, wear resistance, etc., and the surface has multiple micro-pores with strong adsorption and interception capacity. , It is non-corrosive, non-toxic, and has low solubility in acid, alkali and water. Walnut shell is a kind of organic and natural rolling material, not a chemical material. Using it as an abrasive will not damage the surface of the workpiece. Using walnut sand to scour the carbon will not harm the engine, and the effect is very obvious.
After the cleaning machine is connected to the compressed air, the high-pressure air sprays walnut sand into the intake duct of the engine through the sandblasting pipe. The high-pressure and high-speed sand flow will roll and impact in the closed intake duct, and knock the intake valve and the wall of the intake duct. The upper carbon deposits are washed down, and finally the walnut sand and the impacted carbon deposits are sucked out by the sand suction equipment.At present, the cleanest cleaning of carbon deposits has the least impact on the engine. This technology is the first invented and used by BMW, and it is also the most efficient and non-destructive method at present. The other methods are either not clean or have an impact on the engine. Damage, the use of people has been quite few.
The sixth question: How to avoid carbon deposits in daily car use?
Use clean gasoline and qualified engine oil. Carbon deposits are mainly formed by impurities in gasoline and engine oil, so this is also the most effective and most effective method.
Try to avoid prolonged idling and congested sections.
At high speed, the speed can be increased appropriately.
Reasonable use of regular and qualified fuel additives also has a certain effect.
As the saying goes, "three-point maintenance and seven-point maintenance", I have seen old cars running hundreds of thousands of kilometers still work in good condition, and I have also seen cars that need to be overhauled after only tens of thousands of kilometers. I usually treat my own car very well. Pay more attention to it and raise it well, it will definitely not treat you badly.