How to do sound insulation when the engine is noisy

1.Sound-absorbing materials: blankets, wool, cotton wool, sound-absorbing cotton, sound-absorbing cotton beads, sound-absorbing cotton sheets, rock wool, glass wool, glass felt, etc.

2.Sound insulation materials: wood sound insulation board, ceramic sound insulation board, glass fiber sound insulation board, aluminum alloy sound insulation board, rock wool sound insulation board, sound weaving, sound absorbing cotton wall, polyurethane foam, polystyrene board, polyurethane foam board, etc.

3.Noise reduction materials: polyurethane noise reduction pads, sound-absorbing cotton boards, foam noise reduction boards, imitation leather noise reduction boards, wood noise reduction boards, ceramic noise reduction boards, cotton felt noise reduction boards, aluminum alloy noise reduction boards, rock wool noise reduction boards, foam film noise reduction boards, etc.

Abstract] Sound insulation and noise reduction materials [Question] 1Sound-absorbing materials: blankets, wool, cotton wool, sound-absorbing cotton, sound-absorbing cotton beads, sound-absorbing cotton sheets, rock wool, glass wool, glass felt, etc.

2.Sound insulation materials: wood sound insulation panels, ceramic sound insulation panels, glass fiber...

The way to make sound insulation for a loud car engine is as follows:

1. Install some high-grade sound-absorbing foam materials at the engine cover, which can suppress the vibration caused by the hood, and also absorb a lot of noise, with a significant effect.

2. If the engine noise is caused by tire noise, the shock absorbing plate is added with the sound-absorbing pad, which can well solve the road noise and tire noise, tire noise is structure-borne noise, and its main production is vibration, and the best way is to control the vibration;

3. If the engine noise caused by wind noise is large, install or replace the door seal, because the seal is a rubber product, it will age after a long time, and the sound insulation and sealing effect will also become worse, and the faster the speed, the greater the wind noise, at this time it is necessary to install the door seal.

First, the effect of firewall sound insulation and engine compartment cover sound insulation is more obvious, but the project is huge, and the man-hour cost is more expensive, so you must be psychologically prepared. Second, only do the engine compartment cover sound insulation, which has an effect, but it is not as obvious as the first item! 3. Check the engine and make sure the engine is normal.

If the engine is normal, change the oil, and the sound of the engine will be much more pleasant!! Fourth, noise first.

Add the engine under the guard plate, the cabin is soundproof, pay attention to the reflective layer, which can play a dual effect of thermal insulation and sound insulation, but the installation should take into account the heat dissipation in summer, so the installation location should be optimistic, find a professional decoration store.

Remove the seat leather to expose the iron plate, buy the good vibration absorbing plate sound insulation cotton pasted on, the firewall can be pasted as high as possible, four doors, cover, tail box, fender, rain trough the same way, as long as there is an iron sheet on the paste, there is to do chassis armor, the effect of spraying thick points is significant, 50,000 cars can reach the effect of 100,000, and the high-speed feeling is obvious.

Introduction to the noise insulation method of the engine in the car:

1. Some high-grade sound-absorbing foam materials can be installed on the engine cover, which can not only suppress the vibration caused by the hood, but also absorb a lot of noise, and the effect is remarkable. The noise generation of the engine will vary with the engine speed;

2. If there is a leak in the intake and exhaust pipes, the noise emitted by starting the engine can be replaced to avoid the noise;

3. If the engine noise is caused by tire noise, add a damping plate with a sound-absorbing pad, which can well solve road noise and tire noise. Tire noise is structure-borne noise, and its main generation is vibration, and the best way is to control vibration. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed, the worse the road condition, the greater the tire noise, and the difference between the tire irritation caused by the asphalt road and the concrete road surface is also very large;

4. If it is caused by wind noise, install or replace the door seal, because the seal is a rubber product, it will age after a long time, and the sound insulation and sealing effect will also deteriorate. Wind noise refers to the pressure of the oncoming wind in the process of high-speed driving of the car has exceeded the sealing resistance of the door into the car, the faster the driving speed, the greater the wind noise.

Engine noise treatment methods are:

1. The heat-insulating piston is used to increase the temperature of the combustion chamber wall, shorten the lag period, and reduce the combustion noise of the direct injection diesel engine of the space atomization combustion system;

2. Improving the compression ratio and applying the exhaust gas recirculation ring technology can also reduce the combustion noise of the diesel engine;

3. Double spring injection valve is used to achieve pre-spraying. By designing a two-stage lift device, the ignition injection device is used to suppress the combustion noise under a large speed range and acceleration conditions.

4. The common rail fuel injection system is a direct-injection car diesel engine electronically controlled high-pressure fuel injection system, which can reduce the amount of fuel injected during the lag period and reduce the combustion noise;

5. Pressurization. Generally speaking, the speed of the maximum rated power of a turbocharged diesel engine is lower than that of a non-turbocharged diesel engine with the same cylinder size, which is conducive to reducing combustion noise. After the intercooled charge air, the air temperature decreases and the inflation efficiency is improved, but at the same time, the effect of pressurization on reducing combustion noise is also weakened.

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If the engine is very noisy and you want to insulate it, you can add sound insulation cotton on the engine cover, which can effectively isolate part of the noise. It is also possible to add acoustic insulation foam to the doors, which can also isolate some of the noise.

There are many reasons for high engine noise, and some cars have a loud engine when they leave the factory.

Most of the noisy engines are Shenga in-cylinder direct injection engines, and many in-cylinder direct injection engines will make a clattering sound when they are running, which is actually normal, this is the sound of the high-pressure oil pump working.

The in-cylinder direct injection engine must be equipped with a high-pressure oil pump, otherwise the injection pressure of the fuel injector is not enough.

The in-cylinder direct injection engine requires a high injection pressure, which is the only way to atomize the gasoline more thoroughly.

The high-pressure oil pump is in the engine compartment, and most of the high-pressure oil pumps for in-cylinder direct injection engines are near the cylinder head of the engine.

The high-pressure oil pump of some cars makes a very loud sound when Gong Zhaoxiao is shooting, such as BMW's N20 series engine, Honda's L15 series engine, etc.

The noise of the high-pressure oil pump when working cannot be solved, if you are very concerned about this noise, you can not choose the model equipped with the direct injection engine in the cylinder.

The engine of some cars has become louder because of a malfunction, and you should immediately go to the 4S shop for inspection and maintenance after encountering this situation.

Engine sound insulation is generally modified in the engine compartment cover, engine compartment server firewall and other locations to digest and absorb the kinetic energy caused by noise and convert it into energy to fade into the air.

Noise as the number one enemy that endangers the quality of the car, its appearance will not only reduce the driving level of the whole vehicle, but also endanger the driver's concentration on safe driving, which will also lead to certain harm to safe driving. At this stage, most people are dealing with engine noise according to engine sound insulation.

However, because the soundproof cotton at the firewall of the engine compartment server must be disassembled and assembled to disassemble the engine compartment components and its pipelines that are much later in Sofeng, and at the same time need to use a certain basic knowledge of the vehicle to support the point, so we recommend that we go to the technical professional store as much as possible to carry out the actual operation.

What is engine cover soundproof cotton used for?

Although the soundproofing cotton on the engine compartment cover has a certain soundproofing effect, everyone cannot expect much from its actual effect. Its higher efficiency is actually due to the high level that is formed during the operation of the engine. Immediately bake the bonnet to maintain the paint finish on the bonnet from hazards.

Millions of car purchase subsidies.

The sound insulation method of the engine noise is: 1. If Qi Laoguo's engine is noisy, it may also be that the water temperature is too high, so it is necessary to see whether the water temperature gauge is normal and whether there is smoke in the engine compartment. Be sure to change the coolant before winter; 2. If the viscosity of the vehicle's oil is too high, it is easy to cause the engine to run and the problem of lifting wheels, and the lubrication effect will deteriorate, resulting in high engine noise.

Therefore, at this time, you should go to the repair shop in time to check whether it is time to change the engine oil, or calculate whether the time for maintenance is up; 3. If you listen to the engine running normally outside, and feel noisy when you sit in the car, it means that the sound insulation effect of your vehicle is very poor. The vehicle's seals should be inspected to see if there is any signs of aging. Or increase the sealing effect of the vehicle and try how noisy it is.

If the engine is very noisy and you want to insulate the sound, you can install soundproof cotton on the engine cover, which can effectively isolate most of the noise. It is also possible to install soundproof cotton inside the door, which can also isolate some noise.

There are many reasons why the engine is noisy, and the engine of some cars is very noisy when it leaves the factory.

Most noisy engines are in-cylinder direct injection engines, and many in-cylinder direct injection engines make a clicking sound when running. In fact, this is normal, it is the sound of the high-pressure oil pump working.

The in-cylinder direct injection engine must be equipped with a high-pressure oil pump, otherwise the injector injection pressure is not enough.

Direct injection engines require high injection pressures, which is the only way to atomize the gasoline more thoroughly.

The high-pressure oil pump is in the engine compartment, and the high-pressure oil pump for most in-cylinder direct injection engines is near the engine cylinder head.

Some cars make a very loud sound when the Gaosun leather oil pump is working, such as BMW N20 series engine, Honda L15 series engine.

The noise of the high-pressure oil pump when working cannot be solved. If you're very worried about this noise, you can opt for a model with a direct-injection engine.

The engine of some cars has become very noisy because of failure, and you should go to the 4S shop immediately to check and repair it when you encounter this situation.

Millions of car purchase subsidies.