What is the reason for the abnormal noise of Haval engine?

The noise generated by the vehicle engine is caused by the following reasons.

carbon build-up

Because the old engine oil is getting thinner and thinner, more and more carbon is deposited. When the engine oil is thin, it is easy to run the engine oil, resulting in more and more carbon deposits and loss of a lot of power. When replacing the new oil, the engine can't adapt to the viscosity of the oil, which may increase the speed and cause engine noise.

Poor sound insulation

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If you listen to the normal operation of the engine outside and feel loud when sitting in the car, it means that the sound insulation effect of the vehicle is poor. You should check the sealing strip of the vehicle to see if it is aging. Or increase the sealing effect of the vehicle, and then try the noise.

cutting fluid

When the coolant temperature is too low, problems are likely to occur and the noise of the engine will increase. At this time, the replacement should be checked to avoid other problems.

Shock absorber sound

Generally, when passing through the speed bump, you can feel whether the shock absorber on the car is good or not, and when there is a problem with the shock absorber on the car, there will be a problem of loud engine noise.

Engine deflagration knock

When there is knocking, that is, after the spark plug trips, the combustible mixture at the end spontaneously ignites. At this time, the flame center formed by the spark plug igniting the mixture is opposite to the new flame center formed by the final spontaneous combustion of the mixture, and it propagates at the speed of impact, producing sharp knocking sound and increasing engine noise.

Psychological influence

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People's hearing has errors in different environments. From the technical point of view of engine oil viscosity, the noise of engine oil with viscosity of 20 or 30 will be slightly higher when driving in urban areas and slightly lower when driving at high speed. Oil with viscosity of 40 and 50 will be a little quieter when driving in urban areas and a little louder when driving at high speed. Of course, if you want to really distinguish the noise, you have to use a decibel meter to test it.