Can running at high speed play a role in cleaning up carbon deposits?

if high-speed running can effectively clean up the carbon deposits, then there is no need to sell fuel additives except carbon deposits, just increase the speed directly!

how many kilometers of high-speed running can not effectively remove carbon deposits, but the power of the car will really get better after running for hundreds of kilometers at high speed. In fact, the reason why the power becomes stronger is not the reason why the carbon deposits are removed, but the learning function of ECU.

the original intention of high-speed driving is to exhaust carbon deposits by increasing the engine speed, but due to the limitation of energy consumption, the engine speed is low when driving at high speed. Especially, the speed limit of high speed is 1-12km, and the speed of many engines is only about 2r/min, so the requirements for engine power are not high when the car is cruising. Generally, the power of about 3kw can keep the car running at a speed of 12 km/h.

Therefore, high-speed driving does not mean that the engine is working at high load and high speed, which is close to urban working conditions. In this case, it is very difficult to remove carbon deposits.

Now there is always a group of people talking about carbon deposition. Some engine failures will first make you buy products and detergents for your own use. If not, you can go to the repair shop for inspection. If you can ensure that you can add high-quality gasoline, use genuine engine oil and genuine air filter, and maintain good driving preferences, the throttle should be as large as possible when driving in urban areas. In this case, as long as the engine parts are not abnormal, the carbon deposition rate is very low and the amount is very small.

for most of the symptoms, carbon deposition is not necessary, just add brand fuel treasure regularly according to the manufacturer's requirements (if required by the manufacturer). Let's look at what carbon deposition looks like:

The picture above shows a piston in the middle of repairing a car. This car is always fueled with private gasoline, and its maintenance is not timely. After the engine disintegrated, it can be clearly seen that the top of the piston is covered with carbon deposit. Moreover, stubborn carbon deposits and gasoline can't be brushed off, so they can only be scraped off slowly with piston rings! This is the most typical carbon deposit, and the viscosity of the oil is extremely high, just like the black oxide at the bottom of the pan after frying. This carbon deposit is difficult to dissolve and clean manually. High-speed carbon emission is a joke!

The piston is only a part of the serious carbon deposit area, and the intake valve of the in-cylinder direct injection engine is also an area with high carbon deposit.

The carbon deposit on the back of the valve shown above is also stubborn carbon deposit. It is difficult to clean it manually with a scraper, so the valve parts are usually replaced directly during maintenance.

obviously, this stubborn carbon deposit can't be removed by increasing the engine speed, which is realized by increasing the engine speed and air intake. With the increase of air intake, the speed of air flow will also increase. Using high-speed air flow to remove carbon deposits in the intake manifold and intake valve is the same as the principle of compressed air dust removal:

Using the scouring ability of high-pressure air flow to remove dust, but only dust without adhesion on the surface can be removed. What's more, the intake pressure is never as high as the air gun pressure!

For example, the carbon deposit on the valve back and piston top step is plated layer by layer after high-temperature quenching and tempering, which is very hard and has strong adhesion. Once this carbon deposit falls off, it will break into pieces and there is no way to discharge it. If it falls into the cylinder, it is easy to strain the cylinder liner, and the consequences are more serious.

since such carbon deposits cannot be cleaned at high speed, why do people always say that carbon deposits can be made at high speed? In fact, in some cases, mild carbon deposits can be removed at high speed. As I said before, carbon deposition is not formed in a day, but a slow process.

at the initial stage of carbon deposit formation, when carbon deposit is not completely carbonized and its adhesion ability is not strong, it can be removed by increasing the engine speed, part of carbon deposit can be washed away by high-speed strong airflow, and part of carbon deposit can be burned by the high temperature in the engine cylinder during high-load operation. But this kind of carbon deposit that can be cleaned in time is rare. As long as the engine is running, there will be carbon deposition, but the amount is relatively small. In daily driving, if the engine keeps running at high speed, the carbon deposition rate will be greatly reduced. Once the engine is running at high speed, it is only wishful thinking to expect to remove carbon deposits.

Having said that, how is carbon deposition formed? As mentioned above, as long as the engine burns, there will be carbon deposits, but the amount is very small and there is a certain chance to be discharged. The causes of carbon deposition in cylinders are mostly directly related to the quality of fuel and lubricating oil, and also related to driving habits.

gasoline. We all know that gasoline is a mixture of petroleum hydrocarbons and carbon-8. These hydrocarbons are easily oxidized and will produce colloidal substances after oxidation. Gasoline containing colloidal substances can't burn completely after entering the combustion chamber. Residues will be deposited in intake valves, piston tops, piston ring grooves, spark plugs and other parts, and hard carbon deposits will be formed after high-temperature quenching! Engine oil is also a cause of carbon deposition, and the engine oil used for lubrication will inevitably run into the combustion chamber when the engine is working. Engine oil can't burn completely either. After high-temperature oxidation, salt and resinous colloid will be generated, which will adhere to the surface of parts, and after quenching, hard carbon deposit will also be generated. Therefore, some engines with large wear clearance can be repaired with thick carbon deposits on cylinder wall, piston ring, piston top and valve. Driving habits are also a cause of carbon deposition. Long-term low-speed driving and idle running slow engine temperature rise. The gasoline sprayed on the back of the valve evaporates slowly, and the deposited gasoline burns incompletely and eventually forms carbon deposit! Low combustion chamber temperature is also a major cause of carbon deposition. Why is there little carbon deposition in racing cars? Because of the high temperature of the combustion chamber, there is no chance of carbon deposition!

in addition to the carbon deposition in the combustion chamber, the intake manifold throttle and other parts are also areas with high carbon deposition.

the carbon deposit here is mainly caused by oil vapor and gasoline vapor. Engine crankcase exhaust gas finally enters the combustion chamber through the throttle for secondary combustion, and the high temperature of engine oil will evaporate, such as gasoline in the crankcase, the intake valve will not be completely closed when the engine is turned off, and the unburned mixture will also form gasoline vapor. These exhaust gases will eventually deposit in the throttle and intake manifold. This is the same as the range hood at home. Obviously, the lampblack has been taken away, but the oil storage box is full of sticky waste oil! Waste oil deposited on throttle and intake manifold will eventually produce carbon deposit after absorbing dust!

removing carbon deposits is far less important than preventing carbon deposits. nip in the bud is the best policy!

so we should add qualified fuel at ordinary times, and it should be cheap, and add some unknown gasoline! Secondly, don't idle for a long time and try to shift gears at high speed, especially for vehicles that often drive in urban areas. Be sure to use qualified engine oil during maintenance. The quality of air filter elements is also very important, and the filtering accuracy of filter elements that are not up to standard is not enough. Some brands of car manufacturers will require car owners to use fuel additives every 5, kilometers or 1, kilometers, which is very important for in-cylinder direct injection engines and must not be omitted!