Why is it easy to accumulate carbon, the answer has been found

The issue of carbon deposition in in-cylinder direct injection engines has always been controversial, and the key is that each person has a different situation.

To put it simply, the carbon deposits that can often get the car running are much better; The probability of carbon deposition is much higher if it is often congested at low speeds, especially if it is congested for a long time in hot weather.

Here's a quick rundown of the reasons:

In the in-cylinder direct injection engine, the fuel is directly injected into the cylinder and mixed with the intake air for combustion;

The multi-point injection is mixed with the intake air in the intake manifold and then injected into the cylinder for combustion;

Under the premise of high temperature and low speed, the temperature of the fuel mixture in the latter is relatively low, which is theoretically more conducive to full combustion.

In the direct injection mode, the combustion is not so sufficient under the working conditions of low speed and high temperature, and it is easier to deposit carbon.

The principle of direct injection in the cylinder and layered combustion is indeed more efficient and more powerful under ideal working conditions. When traffic jams and slow followers become the norm, and there are few ideal working conditions, it is easy to expose the problem of carbon deposits.

According to incomplete statistics, vehicles with direct injection technology are often recommended to use detergents when they regularly return to 4S stores for maintenance, on the grounds that "they can effectively inhibit the formation of carbon deposits".

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 will also occur here, mainly from the cracking of incompletely burned vanity oil by high-temperature cracking. The carbon particles here are hard and pot-shaped, and in severe cases, they are honeycomb-like 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 be more or less affected by its performance and poor combustion width, 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.

Si Youpu said that the reason for the formation of carbon deposits is introduced.

Motivational carbon deposits are the product of incomplete combustion of fuels and lubricants. It is closely related to the environmental conditions in which the fuel and lubricant are used, the associated properties and the quality of the oil itself. Therefore, all the influencing factors that cause the incomplete combustion of fuel and the abnormal entry of lubricating oil into the high temperature part of the engine are the causes of carbon deposit.

The gasoline engine mixture is too thick, the diesel engine fuel supply is too large, and the air filter or airway is blocked, so that the air supply is reduced, resulting in a decrease in the air-fuel ratio, and the fuel cannot be completely combusted.

The ignition time or fuel supply time is not accurate, resulting in a change in the combustion temperature, and it is difficult to ensure that the fuel is completely combusted. If the ignition is too early, part of the combustion process will be carried out in advance in the compression stroke, so that the gas pressure reaches the maximum value before the piston reaches the top dead center; Fuel consumption increases and ignition is too late, and the combustion process will be delayed in the expansion stroke, resulting in a decrease in combustion pressure and an increase in fuel consumption.

The engine temperature is too low, and the spark plug or injector is not working well, resulting in poor atomization or vaporization, so that the fuel cannot be completely burned. When assembling, the piston ring is counterparted, the reverse piston ring is installed in the direction of the twisted ring groove, the elasticity of the piston ring is weakened, or the end clearance is too large due to wear, the piston ring and the cylinder wall are too large, or the cylinder wall is worn too much, resulting in poor sealing, resulting in oil channeling into the combustion chamber.

Poor sealing of valves and valve seat inserts, excessive wear of valve stems and valve guides, and excessive clearance lead to oil entering the cylinder and adsorbing on the valves.

The quality of the fuel is poor, there are many impurities, and it does not meet the regulations. Fuel quality has a great impact on the pollutants emitted by automobiles, among which olefins, aromatics and metallic substances increase the carbon deposits in the cylinder, which increases the exhaust emissions. The fine dust particles contained in the air cannot be completely removed by the air filter, and the oil and gas wash over the back of the valve, causing fine scratches after a long time of washing. Fine particles and lubricating oil from the crankcase are stored in the scratches, forming a lacquer at high temperatures, which accumulates over a long period of time and forms carbon deposits with wax and other components in the mixed fuel.

Traffic congestion makes the engine run at idle speed for a long time, resulting in a thicker gasoline engine mixture, when the thicker mixture passes through the intake manifold of different widths, different lengths and has a certain bending arc, due to the different densities of air and gasoline particles, the air is relatively easy to change direction, and the gasoline particles continue to move to the end of the manifold by the action of inertial force, resulting in poor uniformity of mixture concentration. There is no guarantee that the fuel will burn completely.

<> "Why is there still carbon deposits.

If you want a stable, easy-to-drive car, you have to work hard to do daily maintenance. However, as the time spent in the car increases, the car will experience poor power, slow speed, and increased fuel consumption.

One important factor is overlooked – engine carbon deposits. To put it simply, carbon deposition is caused by insufficient combustion of the mixer in the engine, and excessive accumulation will cause blockages in the combustion chamber, fuel injectors, intake valves, spark plugs and other parts.

What are the typical manifestations of carbon deposition in cars?

When the car starts, slight body shaking is normal. If the body shakes violently or frequently, it may be caused by carbon deposits. Because the engine at this time needs more power to support the operation of the vehicle, the body shake will be obvious.

One of the major manifestations of carbon deposition is the increase in fuel consumption. When the accumulation of carbon deposits is severe, it can cause a series of chain reactions - poor ignition of the engine intake and spark plugs.

If the gasoline is not burned sufficiently, the kinetic potential energy transferred to the vehicle during driving will be reduced. When the vehicle is starting or climbing, it will feel that the speed cannot be increased significantly. If you obviously feel that the power has dropped while driving, you can check the spark plug or engine throttle valve to see if carbon deposits are attached to it.

How to reduce carbon deposits?

In order to reduce carbon deposits at the source, we must do a good job of prevention. Adding fuel treasure when refueling is a practice that most car owners will choose. However, most of the fuel products on the market are accelerants, which have little effect on carbon deposition.

The use of poor or fake fuel treasure will cause some damage to the car.

A common way for veteran drivers to remove carbon deposits is to step on the accelerator in neutral.

If you step on the accelerator again and again, you may not be able to completely burn the freshly sprayed concentrated mixture, which will accumulate in the cylinder and form new carbon deposits.

In addition, parts cleaning agents can also be added with gasoline to remove carbon deposits. Its advantages are low level, wide range of clarity, simple operation, etc.

Why is there more moisture in parts cleaner? Because the product contains a lot of moisture, it is a "visual error" caused by the high content of cleaning solution in the parts cleaning agent and the large amount of cleaning liquid sprayed. Some low-priced competitors have a high content of methylene chloride, a low content of cleaning liquid, and a high content of promoter, so the cleaning liquid sprayed is less and quickly vaporized and volatile, so it feels "less moisture".

What are some tips for using it? In the actual operation process, there may be a situation where the spray is not finished. This is generally because the operator fixes an angle to spray, and when the cleaning liquid is not much, the catheter in the aerosol is facing upward, and the catheter cannot touch the cleaning liquid.

At this time, you only need to turn the head of the spray town to continue spraying.

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 under the repeated high temperature action of the engine is called carbon accumulation.

One of the reasons for carbon accumulation 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 don't clean up the carbon deposits 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.

Low carbon refers to the carbon and black rubber substances that depend on the intake and exhaust valves, intake tracts, combustion chambers, and fuel injectors inside the engine. The main reason for this is insufficient fuel combustion.

Si Youpu said that the reason for the formation of carbon deposits is introduced.