Views:1011 Author:Site Editor Publish Time: 2021-09-23 Origin:Site
Although the exhaust pipe is a small pipe, it contains a lot of secrets. The main function of the exhaust pipe is to exhaust and silence. The composition of the entire exhaust system is: exhaust manifold, catalytic converter, mid-muffler(glasspack), muffler and the pipe connecting them. The exhaust manifold is installed on the cylinder head, the other end is connected to the front section exhaust pipe, and then the middle section and the rear section are connected in turn. Except for the two ends of the exhaust manifold fixed with bolts, the other entire pipelines are hoisted by rubber The ear suspension is hung under the car body, and it can swing up and down and left and right when the road is bumpy, so that the vibration generated by the exhaust will not be transmitted to the cabin.
Everyone knows the muffling effect of the exhaust pipe. Because the gasoline burns violently in the cylinder, the sound is very loud. With the muffler of the exhaust pipe, the sound becomes small. If there is no muffler, the sound will be deafening, louder than the sound of a farm tractor when you step on the accelerator.
In addition to silencing, the exhaust pipe also has an effect on the power of the car. In theory, we believe that the faster the exhaust gas produced, the better, but in reality it is not the case. Exhausting too fast or too slow has an impact on the car. Here is a concept called exhaust back pressure, which refers to exhaust resistance. The exhaust pipe is very long and curved. When exhausting, there will be resistance to exhaust gas. The resistance is expressed by exhaust back pressure. The greater the back pressure, the greater the exhaust resistance, and the more difficult it is for exhaust gas to be discharged; the lower the back pressure, the smaller the exhaust resistance and the smoother the exhaust.
Excessive back pressure will definitely affect the engine power, because the exhaust gas cannot be effectively discharged, and the pressure in the exhaust pipe is very large. If the exhaust gas in the cylinder wants to enter the exhaust pipe again, the piston is required to push outward with greater force. The resistance received during the exhaust stroke is large, which will cause additional loss of engine power. It's like pushing an object. If the resistance of the object is low, it can be pushed away by pushing it slightly; if the resistance is high, then pushing hard, which is more laborious. The engine will consume additional energy. In extreme cases, if all the exhaust pipes are blocked, the engine cannot continue to run because exhaust gas cannot be discharged.
Too little back pressure will also affect the engine power, but it will affect the low-speed power. Let's focus on explaining it. Because the exhaust has a certain time interval, it is not continuous, only when the piston of a cylinder is running the exhaust stroke, the exhaust will be exhausted. When the engine speed is low, the exhaust time interval of each cylinder will be longer. With this time interval, each exhaust gas has enough time to be discharged from the exhaust pipe outside the car, but not in the exhaust manifold. stay. In this way, the gas pressure at the exhaust manifold is much lower than the gas pressure in the cylinder, which will generate a suction force that sucks the exhaust gas from the inside of the cylinder and accelerates the speed of the exhaust gas. If only exhaust gas comes out, it has no effect, and when the exhaust valve is about to close but has not yet closed, the intake valve has already begun to open at this time, and there is an intake advance angle, so the exhaust valve is not closed and the intake The coincidence time that the valve has been opened. Because of the fast exhaust speed, the little mixed gas that has just entered will also be sucked out by the strong suction and discharged from the exhaust valve. Because the mixture is lost a little, the power of the car will drop.
When the engine is running at a high speed, the exhaust gas volume increases greatly and the adjacent exhaust interval time becomes shorter. The exhaust gas will not be discharged smoothly. Exhaust gas will be trapped in the exhaust manifold, forming a certain pressure. In this way, the pressure difference between the cylinder and the cylinder will not be too large, and a large suction force will not be generated to suck the exhaust gas in the cylinder, and the mixture will naturally not be sucked out. Therefore, a small back pressure is more suitable for the engine to operate at medium and high speeds.
The structure of the exhaust pipe directly affects the level of exhaust back pressure, such as the degree of curvature, the smoothness of the inner wall, the thickness of the exhaust pipe, the structure of the muffler, etc. The car has been well balanced in the design. Therefore, the original exhaust pipe for family cars is the most economical. Nowadays, there are more changes to the exhaust. Generally, simple changes to the exhaust are to reduce the back pressure and make the exhaust noise. Use a smoother exhaust pipe, change the tail muffler, reduce the bending of the exhaust pipe, thicken it, etc., anyway, find a way to make the exhaust smoother. In this way, the power of the engine will increase at medium and high speeds, but at low speeds, the power will drop slightly. However, the exhaust sound can be changed very beautifully, and it is more valued by many people.
The exhaust pipe of a car is exposed to the chassis of the car, so when refitting and choosing various bending pipes, it is necessary to consider the quality and materials of the elbows. We have introduced to you the pipes involved in various exhaust systems under the GRWA brand before.
GRWA's bending pipe products follow strict production specifications and procedures, each process has a unique tooling positioning, and production is carried out in strict accordance with the "6A standard" to reduce errors and ensure that the products are properly loaded.
In terms of product strength, three-pass welding is adopted, which is shock-resistant, firm, and will not break. The combination of semi-automatic and fully-automatic equipment makes the long elbow formed at one time. Where welding is needed, fish-scale welding technology will be used to beautify the weld of the elbow, and the pulse will make the product more refined.
The most important thing about bending pipes is smooth exhaust. GRWA’s products are rigorously selected. The inner wall of the pipe is smooth and free of burrs. Ultrasonic cleaning ensures that there is no impurities inside the pipe, unobstructed airflow, and no performance problems.
316L electrode welding, A-level grinding process, to ensure that the product is firmer and does not rust. While ensuring the beauty, it has more use value.
The quality inspection is strict, and each set of products will be tested by precise inspection tools before packaging to ensure that each set of products has no deformation and no installation problems.
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