Motor detonation is one of the most disturbing problems of the car. However, the majority of motorists do not even represent that this is the process and why arises. In fact, detonation occurs with the wrong distribution of the mixture "air-fuel" inside the cylinder, which makes uneven burning. Under the optimal conditions, fuel burns in a cylinder when mixed with the necessary energy and air. When an explosion occurs inside the cylinder, it burns unevenly, which is capable of damaging the piston itself and the walls of the cylinder.

Detonation what it is

The motor detonation is called the process of spontaneous ignition of the fuel mixture in the cylinders, which is the character of an explosive wave.

It appeared simultaneously with the motor internal combustion and describe it as an automatic gas ignition in the combustion chamber. Initially, check the detonation action was impossible and it was believed that the whole problem is in the ignition. However, in the 1940s, the theory of its occurrence was verified.

Detonation sensor, where and what is the signal

The detonation sensor is mounted on modern devices, which is capable of monitoring the level of danger.

This device perceives, after which it converts to the electrical pulse mechanical energy of cylinder oscillations. In fact, the sensor always sends the signals to the electronic motor control unit, when the unit itself monitors changes in the ignition advance and composition of the mixture. In addition, thanks to him, it is possible to achieve the most economical work at high motor power.

Signs of detonation, what the driver should pay attention to

When the motor goes into detonation, a strong noise is heard. Since its consequences are pretty sad, it is necessary to diagnose the cause of this explosive burning of the fuel mixture. To eliminate the problem, it is possible to change the operation of the motor, otherwise it is capable of destroying it for a short period of time.

The specific sound from the motor in the process of such a phenomenon is caused by the pressure of the wave from the vibration of the cylinder walls in the case of combustion. The height of the sound wave is determined by the shape and gas, thickness and dimensions of the combustion chamber, as well as the walls of the cylinder.

The detonation of the motor at idle is capable of occurring after passing the vehicle with the conditions, which contribute to the heating of the elements of the power unit. If even the ignition is turned off, the crankshaft under the influence of energy continues the movement, which leads to a fuel insertion into the engine cylinder, where it has time to warm up to high temperatures and flammifies itself.

Causes of engine detonation

Motor detonation has one of the most destructive effects in any unit.

It is for this that it is necessary to urgently learn how to eliminate the problem, after the detection of the following reasons for explosive burning:

1. Motor control problems.
2. Engine cooling problems.
3. Spark plugs are incorrectly selected.
4. O2 sensor is bad.
5. The fuel pump is incorrectly functioning.
6. Fuel injectors are limited.
7. Faulty nozzles.
8. Crashing or dirty fuel filter.
9. Octane Fuel Number Low.
10. The quality of fuel is low.

It is worth knowing that these reasons are relative.

There is no absolute time, ignition advance or displacement of force, which guarantee the appearance of detonation. However, there are no completely absolute parameters that ensure that this phenomenon will not happen.

There are a lot of reasons for the appearance of the engine detonation, we will look at the most common.

Low fuel quality, one of the causes of detonation

One of the most popular causes of the detonation of the motor is a low octane number and low fuel quality, which can cause many problems, such as excessively high-pressure cylinders and an increased temperature in the combustion chamber.

The octane number displays what the compression will be able to transfer gasoline - than the rating above, the fuel is resistant to ignition. It is on this more complex high-pressure motors that need more precious fuel. Sometimes the octane number of fuel is called an anti-knock index. Manufacturers advise a certain type of mix that would achieve maximum performance in their cars.

Such problems are able to lead to preliminary ignition, which, in turn, entails premature combustion of fuel in the motor. In the combustion chamber, gasoline is able to ignite as a result of improper degree of compression or from the spark plug. Any factor and such a fragile equilibrium can spoil the whole process. Too low motor compression leads to the fact that fuel does not combine completely and the remaining elements stick to the internal departments of the chamber. Such accumulation has a negative impact on cylinders, which is a frequent cause of explosive burning.

Nagar in cylinders, the second cause of detonation

All kinds of fuel have a certain level of cleaning, but this is not enough to stop the deposits of Nagar. When deposits are formed, the volume of the cylinder is effectively reduced, the compression increases and can cause detonation. To solve the problem, it is necessary to buy clean additives in the auto shop, after which it is fuel.

Spark plugs like spark plugs affect the occurrence of detonation

Another reason for the detonation of the motor is the use of irregular spark plugs. Quite often, motorists buy incorrect devices, as a rule, in order to save, thereby not adhering to the manufacturer's recommendations. Since the spark plugs make it possible to control over the inner medium of the motor and operate in fairly accurate conditions, incorrectly chosen candles are able to create conditions for improper combustion of fuel. They are able to lead to an increase in the temperature of the running parts and to build combustion in the chamber, which are the main causes of detonation.

The above described reasons are the most common and fairly inexpensive in terms of correcting the problem. However, if at your vehicle after eliminating these reasons, detonation in the motor is still present, it is necessary to go to the car service where your problem will be solved quickly and efficiently.

Engine detonation, how to prevent and eliminate detonation

High speed makes it possible to reduce the likelihood of detonation, as it reduces the burning time. Therefore, the maximum pressure and high temperatures will not have an effect on the mixture of air-fuel. For example, if you drive your vehicle from a hill along a flat straight road. When you again go to the mountain, you will start to lose speed and sometimes you can hear how the car is detonated. To receive acceleration, you switch the transmission below to one or two positions and accelerate again, removing this phenomenon.

In fact, the increase in humidity also reduces the risk of detonation. Reducing the combustion temperature contributes to the high content of water in the air.

To obtain maximum performance without detonation, motorists use the following tricks:

1. Use higher octane fuel.
2. Broke up to ahead of ignition.
3. Reduce the temperature in the combustion chamber is possible with the help of an intercooler or by injection of water. The incoming foaming air takes the cooler and transmits it by a series of air coolers, reducing the temperature.

Tips of professionals

Motor detonation is not a new problem, over the years, manufacturers have tried to eliminate her appearance. Although the detonation process is quite complex and potentially dangerous for the motor, realizing the causes of detonation, it can be easily controlled by it. Foreign knocks and noises emanating from your engine may indicate detonation, this is necessary to pay attention to them and immediately remove them.