Why is there carbon deposition in the car s air intake system? Is it dust? Is it dangerous to deposi

Hello! I am happy to answer for you, usually people think that the hazards inside the car intake are mainly dust, which is not true, the main hazard ** is two parts, one is the oil sludge and carbon deposits formed by the cracking of engine oil, and the other is the carbon deposits caused by the cracking of unburned fuel.

The oil sludge comes from the lubrication system of the engine, and modern vehicles for the purpose of environmental protection, the lubrication system (such as crankcase, cylinder head, etc.) is connected with the intake duct through several vacuum tubes, and the oil vapor harmful to the atmosphere is burned through the combustion chamber, and then the exhaust gas can be discharged out of the car after being filtered by the three-way catalytic converter, so some of the oil vapor adheres to the inlet pipe wall, and the oil sludge is traveled. The unburned fuel comes from the fuel supply system, and the mainstream EFI engine injects fuel into the intake manifold through the fuel injector to mix with the air, and then enters the combustion chamber, which will inevitably leave residue in the intake pipe; In addition, there will always be a fuel injector that does not burn after spraying the fuel every time the engine is turned off, and the fuel remains in the intake pipe, which is the main reason why there is always a large amount of carbon residue on the back of the intake valve. (Except for in-cylinder direct injection models).

These carbon deposits accumulate near the throttle valve, pipeline, and intake valve, disrupting the normal intake airflow, and even producing a reverse cyclone, the faster the speed, the more obvious the obstruction, and the accumulation to a certain extent will lead to a series of problems such as unstable vehicle idling, difficult starting, weak acceleration, and affecting the top speed.

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The residue of substances in the fuel injector, throttle, oil pipeline, spark plug, cylinder head, inner wall and other parts caused by insufficient combustion of gasoline in the cylinder, and then the black gum produced by the repeated high temperature action of the engine is called carbon deposit.

One of the reasons for carbon deposition is that the fuel is not completely burned and adheres to various parts of the engine, which can form carbon deposits over time. The main function of additives is to drill into the pores of carbon deposits with strong surface activity, destroy their structure, and gradually dissolve these carbon particles from the metal surface, and then discharge them through the exhaust gas after burning with the fuel at high temperature.

The increase in carbon deposits in the car will lead to insufficient combustion of the engine, resulting in an increase in fuel consumption and a long time when the car failure light is on.

Ways to slow down the formation of carbon deposits:

Use high-quality fuel. Because the main components of carbon deposits are wax and colloidal deposition in the fuel, the lower the colloidal content in the fuel, the better. But we can't change the quality of the fuel, but we can choose not to add unidentified cheap fuel.

2.Avoid driving at low speeds for long periods of time. If necessary, the high speed can be pulled at a regular time. The principle of removing carbon deposits at a high speed is to speed up the airflow, which can carry away a small amount of carbon deposits that are not firmly attached. The combustion temperature is increased so that part of the carbon deposits in the cylinder are burned.

Carbon deposition hazards. If the carbon deposit is not cleaned for a long time, the operation of the whole vehicle will be caused, the internal channel of the engine will be blocked by carbon deposits, the engine power will become worse, and the occurrence of fuel consumption, abnormal engine noise, and unstable idle speed will occur, thereby reducing the power of the automobile engine, increasing fuel consumption, and causing the combustion rate to be too low. If you do not clean up the carbon deposit in time, it will not only cause a certain degree of harm to the car, but also the harm to the environment, modern society pays attention to energy conservation and emission reduction, and exhaust emissions must not exceed the standard, so we should pay attention to this problem.

Usually 5000 kilometers with effective PNF fuel additives to clean the overall oil circuit carbon deposits, a long time not to clean up the carbon deposits will cause the operation of the whole vehicle, so that the internal channel of the engine is blocked by carbon deposits, the internal fuel injection of the car is not smooth, so that the engine power becomes poor, thereby reducing the power of the car engine, increasing fuel consumption, and the combustion rate is too low.

After the car has been used for a long time, remember to remove carbon deposits.

The reason is that the excess air coefficient causes incomplete combustion, produces carbon particles, affects and destroys the lubricating oil film, spark plug carbon deposit, affects the ignition efficiency, and the exhaust soot emission becomes larger.

The formation of carbon deposition in automobile engines is mainly caused by incomplete combustion. Reducing the life of the engine is a major hazard. Others, such as 1, reduce engine power 2, increase fuel consumption 3, cold start difficulty 4, combustion chamber detonation 5, low speed acceleration sound, damage to the piston and crankshaft 6, emissions exceed the standard.

7. Exhaust gas is not up to standard = fines and confiscation.

Effects of excessive carbon deposition in the combustion chamber:

1. The engine combustion chamber is the worst place in the working environment of the car, which is under high temperature and high pressure for a long time. Inevitably, carbon deposits also occur here, mainly from the pyrolysis of incompletely burned fuel. The carbon particles here are hard and pot-shaped, and in severe cases, they are honeycomb and have a certain thickness;

2. The carbon deposition here will affect the intake vortex, hinder the rate of flame propagation, and lead to a decrease in power, which will lead to engine knocking (commonly known as cylinder knocking), and even excessive pressure leading to combustion chamber breakdown;

3. Slight carbon deposition does not matter much, but carbon deposition in the combustion chamber is an accumulation process from slow to fast, so daily cleaning is very important.

4. It is difficult to start the vehicle in winter, and the engine shakes after starting, and even causes the engine not to start; There will be a lack of acceleration of the vehicle; Idle shaking of hot cars; the phenomenon of increased oil consumption; Every carbon deposit inside the engine will have a bad impact on the normal operation of the engine, and in severe cases, it will cause irreversible damage to the engine piston.

The commonly used methods are: dismantling and washing, hanging bottle cleaning, and fuel additives.

1. Dismantle and wash. This method is very direct and rude, but it is generally sent to the 4S store for disassembly, the disassembly of the engine is more complicated, no matter what parts will affect its performance more or less every time it is disassembled, you need to ask a professional master to disassemble. The carbon deposits in the engine can be seen directly when dismantled and washed, and the cleaning will be relatively clean.

However, the cost will be relatively high, and it will also require technology.

2. Hanging bottle cleaning.

This method is also relatively common, the hanging bottle is to discharge the cleaning agent into the air intake, dilute and soften the carbon deposit to turn it into a slurry, and then burn it from the cylinder to discharge. Generally, the cleaning objects include the intake tract, throttle, intake valve, fuel injector, cylinder inside, etc., but the effect is not as direct and obvious as dismantling and washing.

3. Fuel additives.

One of the causes of carbon deposition is that the fuel burns insufficiently, which adheres to various parts of the engine and forms carbon deposits over time. The main function of additives is to drill into the pores of carbon deposits with the help of strong surface activity, destroy their structure, and gradually dissolve these carbon particles from the metal surface, and then discharge them through exhaust gas after burning with fuel at high temperatures. Effective fuel additives such as PNF stock solution is not corrosive, can clean the whole oil circuit, fuel tank impurities, fuel tank moisture, high-pressure oil pump, built-in gasoline filter, fuel injector, piston top, intake valve, exhaust valve, long-term use has a good cleaning effect on the ternary catalysis, will not block the ternary, the safety is relatively high.

Knowledge of carbon deposition in the engine.

The impact of engine carbon deposition on the car is still quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless. The second is to increase fuel consumption and increase your financial burden. The third is the difficulty of cold start, that is, the difficulty of ignition, and it is not easy to get on the car.

Finally, serious carbon deposition in the combustion chamber will also cause cylinder detonation, and there will be a sound of low-speed acceleration, which will cause damage to the piston and crankshaft, which will seriously affect the safety of the car bridge. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment. The specific principle is that if you do not pay attention to the oil and driving habits for a long time, the wax and gum in the gasoline will accumulate thicker and thicker, and carbon deposits will be formed when they harden after repeated heating.

If the engine burns oil, or if the gasoline is of poor quality and has more impurities, the valve carbon deposits are more serious and form faster. Because the structure of carbon deposition is similar to that of a sponge, when the gas sells and dissipates the door to form carbon deposition, a part of the fuel injected into the cylinder will be adsorbed, which makes the concentration of the mixture that really enters the cylinder thinner, resulting in poor engine work, and abnormal phenomena such as difficult starting, unstable idling, poor acceleration, urgent refueling and tempering, excessive exhaust gas, and increased fuel consumption. If it is serious, it will cause the valve to be closed loosely, so that there is no cylinder pressure in the cylinder and it will not work at all, and Zhongzheng will even stick the valve to make it not return.

At this point, the valve and piston will interfere with the movement, which will eventually damage the engine.

To know the best way to clean up carbon deposits, first know how it is created.

Why is carbon deposited generated? This is because the fuel itself contains gum, impurities, dust, moisture, etc., which accumulate over time to form sludge and other deposits in the fuel tank, oil inlet pipe, etc.; The second is due to the oxidation and polymerization of unstable components such as olefins in gasoline at high temperatures, forming colloidal and resinous viscous, which stays in the fuel injector, air intake valve, etc., and the deposit will become hard carbon deposits when burned. In addition, traffic congestion, cars are often at low speed and idling, which can aggravate the formation and exacerbation of carbon deposits and sediments.

If carbon deposits are not cleaned in time, carbon deposits and deposits will block the needle valve and valve hole of the fuel injector, resulting in poor closure of the intake valve, a drop in cylinder pressure or even tempering, resulting in unstable engine idling, increased fuel consumption and deterioration of exhaust emissions.

Carbon deposits on the piston top and cylinder head can easily cause local overheating of the combustion chamber and gasoline preheating, resulting in engine knocking and other failures. These failures can shorten the life of the engine.

The best way to clean up carbon deposits in your car:

1. In fact, the hanging bottle is filled with a pressurized atomized cleaning agent, and the cleaning agent is sent into the air inlet to carry out a "solvent dissolution" reaction with the carbon deposition of the throttle valve, fuel injector and other components, and then the carbon deposition is cleaned out of the engine by using the high engine speed, but the carbon deposition is very serious, which will cause the three-way catalytic system to be blocked or even damaged;

2. The use of detergent pours the cleaning agent into the machine, sprays it into the combustion chamber with machine pressure, allows the cleaning agent to react with the carbon deposit to dissolve, and then extracts the waste liquid, if the carbon deposit is very serious, the large carbon that falls can not be completely extracted, which may damage the combustion chamber;

3. It is best to use an effective release agent, which will clean the oil circuit and carbon deposits, and release the piston ring. If you want to use a PNF-type cleaner, you can release the piston ring.

What is carbon deposition: Carbon deposition refers to hard cemented carbon, that is, carbon deposition formed by the continuous accumulation of colloids (mainly composed of hydroxy acids, asphaltenes, refueling substances, etc.). The resulting fuel and lubricating oil that enters the combustion chamber in series cannot be completely combusted, thus adhering to the intake and exhaust valves, cylinder edges, piston tops, spark plugs, combustion chambers, etc.

Because gasoline cannot be burned completely all the time, there will always be incomplete combustion. Coupled with some of the components contained in gasoline, carbon deposits always occur after combustion. When the carbon deposit is low, it will hardly affect the vehicle; When there is a lot of carbon deposit, it will affect the normal operation of the engine.

There are two ways to slow down the generation of carbon deposition. The first is to reduce the working conditions of incomplete combustion as much as possible, and the second is to discharge carbon deposits in time. Both of these methods are closely related to driving habits.

Under normal circumstances, the habit of using the car determines the speed of carbon deposits, often walking in traffic jams, stop-and-go, and low-speed driving, and every time you drive closer, you can accelerate the generation of carbon deposits. If you're not a veteran driver, you may not feel the changes in your car until the carbon deposits are severe, so be sure to visit the garage for regular check-ups.

Carbon deposition is mainly caused by the incomplete combustion of oil, what is called incomplete combustion?

That is, the gasoline is not 100% burned, and the gasoline that is not burned all will be carbonized and will precipitate.

Under what circumstances does gasoline burn poorly? When there is more oil and less oxygen, it will lead to insufficient oxygen and unclean combustion, such as stepping on the accelerator violently when starting, and at this time you will see black smoke coming out of the exhaust pipe, which is actually a manifestation of insufficient combustion.

Carbon deposits can also occur if there is gasoline fluid in the combustion chamber or if the engine is faulty and the combustion is not sufficient.

1.Poor fuel quality.

China's fuel octane content is low, contains more impurities and hydrocarbons, high sulfur content, the way to increase the octane number mainly relies on the addition of antiknock agent, and antiknock agent, especially manganese-containing antiknock agent, will have many negative effects on the engine. Manganese-containing antiknock agent, in which olefin impurities are unsaturated hydrocarbons, due to their unstable chemical properties, are easy to polymerize into colloidal substances and deposit on the surface of some high-temperature engine parts such as combustion chambers, throttles and fuel injectors. An impurity in fuel oil that is easy to form carbon deposition is aromatic hydrocarbons, which have a large density ratio, high carbon content, poor ignition and are difficult to burn completely; The high viscosity of aromatic hydrocarbons and poor volatile atomization make the injection angle of fuel smaller and the droplets larger, resulting in incomplete combustion of fuel and more carbon deposits.

Aromatic hydrocarbons are the primary substances for the formation of carbon deposits during gasoline combustion, and the higher the content of aromatic hydrocarbons in gasoline, the more serious the carbon deposition pollution.

2.Air pollution.

Since the filter element of the engine air filter can only filter out dust particles with a diameter of more than 20 m, PM10 in the air can pass through the air filter element and enter the intake manifold and cylinder, and some of them will be adsorbed on the cylinder wall and the top of the piston and other parts with surface lubricating oil, forming "sludge", which will form loose gelatinous matter under high temperature baking. In addition, dust particles entering the intake manifold directly cause abnormal wear and tear on the car engine. When the valve guide, valve seal, piston ring and other parts are worn, part of the oil will enter the combustion chamber for combustion, due to the poor combustion performance of the oil, more residues will be produced after combustion, so that the deposition rate of engine carbon deposition will increase significantly.