Sagitar engine is noisy, how to solve the noise of Sagitar engine?

Chuanqi gs4 engine is the main noise source, and its noise generation varies with engine speed. Engine noise will be generated and transmitted through the front fender, hood, firewall, exhaust pipe and other components. Can be solved in the following ways;

First, doing firewall sound insulation and engine compartment cover sound insulation, the effect is obvious, but the workload is huge and the working hours are expensive, so you should be mentally prepared.

Second, only the engine compartment cover is sound-proof and effective, but it is not as obvious as the first item.

Third, check the engine to make sure it is normal. If the engine is normal and the oil is changed, the sound of the engine will be much better.

Fourth, it is noisy. First of all, I suggest you check the firewall for water leakage, then check whether the intake and exhaust pipes are leaking or damaged, and then check whether the screws of the chassis are loose. If there is noise during driving, please check the bearing and transmission shaft.

After the car is covered with a layer of sound insulation cotton, the sound insulation effect is like adding a layer of cotton to your earplugs to minimize the noise outside.