Here are the car maintenance knowledge you don't know, and the true stories behind those illusions. If you want to become a real car expert, this is one of the best ways for you to add knowledge. Regarding the known, unknown, curious, and ignorant of the car, you can find the answer here. For both you and me, this may be a new beginning!
How much does driving habits affect the performance of a car engine? The experience of this Audi A6L may open a new chapter for you.
The Audi A6L in front of you has reached 80,000 kilometers. Since the beginning of winter, there will be obvious shaking when starting the engine in the morning. And fuel consumption increased significantly and power began to decline. Eighty thousand kilometers is not easy to break for some core components. Inspection found that the combustion of the spark plug is in good condition and the engine does not have any fault codes. Perhaps the fault comes from one of the most overlooked points, which is the carbon deposit of the engine.
In order to verify my judgment, I inserted the endoscope into the valve port and saw that a large amount of carbon deposits gathered at the valve port. In fact, the most effective treatment method for carbon deposits at this location is physical removal. Hanging bottles and adding additives only play a psychological role, and the actual effect is minimal. The intake duct has been completely removed by me, and then I began to remove the carbon deposits.
This angle will have a clear observation of the carbon deposits. The carbon deposits condensed at the valve port have been attached to the valve. The original metallic luster is now completely gone, leaving only the black air inlet.
The intake port assembly, which integrates the manifold injection fuel rail and fuel injector. This is a major technological change in the third-generation EA888 engine to improve thermal efficiency and reduce in-cylinder carbon deposits, but the current results show that the control of in-cylinder carbon deposits does not seem to be satisfactory.
The end of the intake port in contact with the valve port is still very clean and tidy. The blue sealing ring at the interface does not have any aging or deformation, and the seal is in good condition.
What is black technology, it is really everywhere in this inlet. There is a small replica at the interface of the air inlet, this small flap can adjust the size of the opening and realize the control through the vacuum pressure. The existence of the small flap is to restrict the effect of harmonic boost, and the purpose is to control the return of the mixed gas to form carbon deposits in the intake duct. This is the real reason why the intake pipe of some models will also turn black.
This is the rectifier plate at the valve port, which will form a swirling vortex behind the valve during intake, which affects the intake efficiency. This rectifier plate is used to eliminate this vortex and make the air intake more smooth. Seeing the carbon deposit attached to the rectifier plate, you know that the carbon deposit is really pervasive.
Have seen so many carbon deposits, let’s say a happy event. Although the carbon deposits inside the engine are too much to look like, there is almost no dirt at the throttle. If the owner has not washed it before, the throttle valve in this state is really too clean.
Next is the beginning of the highlight. The past method is to use metal equipment to scrape off the carbon deposits attached to the engine. This is for the aluminum alloy cylinder block. The damage is great. The way of washing walnut sand can completely avoid this potential damage. As the name suggests, it is to use the powder of walnut shell crushed. The high-pressure gas and walnut sand are sprayed together, and the strong impact force can wash away the carbon deposits. Because the hardness of walnut sand itself is much lower than aluminum alloy material, Will not cause any damage to the engine.
The machine similar to the vacuum cleaner in the picture is a walnut sand washing machine, and the noise at work is quite loud. The two pipelines are walnut sand and high-pressure compressed air. If you think this technology is very advanced, I can definitely answer you that this is BMW's technology more than ten years ago, and now the better way to remove carbon is dry ice blasting.
Directly aim the nozzle of the decarbonizer at the valve port, and it will take about ten minutes or so. Of course, this is just one valve opening, and it takes a lot of time to clean up four.
Carburetor cleaning agent is a relatively common cleaning agent, and it has a good effect on dissolving some carbon deposits. The carbon residue after dissolution cannot be left in the valve port. The tube is used to suck away these residues.
The effect after clearing is still very intuitive, this is what the inlet should look like! Yellowed in the lower right corner are the fuel rails and injectors with direct injection in the cylinder, which are also the powerful features of the third-generation EA888 engine. The dual-injection system is now the mainstream configuration of the engine, and Audi is already ahead.
The sanding process of the valve port is clearly visible, even after the high-speed impact of walnut sand, there is no scratch. I mentioned above that dry ice blasting is a better way to remove carbon deposits, but machinery and equipment are really not affordable for ordinary people. With equipment prices of more than 100,000 yuan, cost return is very slow.
Now it can go on the road again and continue to gallop.
is written at the end: The formation of carbon deposits is natural and cannot be completely eradicated. Poor driving habits are one of the main reasons for carbon deposits. When the engine has been running at a low speed, the impact of high speed cannot be obtained. Carbon deposits will be generated due to insufficient combustion at low speeds, and will accumulate more and more. So there is a particularly strange phenomenon, that is, the carbon deposits of the engines that often run at high speeds and drive with a big throttle are very small. It is because the tremor of the high-speed engine's valve has been able to remove a part of the carbon deposits, and the slight carbon deposits can be burned away by high-temperature combustion. If you are careful enough, you will find that the power of the car after running at high speed will increase significantly, which is the reason. If you want the engine to have a better condition, remember not to drive at low speed for a long time, more exercise is the right answer.
