In almost all cars, the exhaust pipe is not fixed, so it is simply suspended. So you are not afraid of falling off halfway? The rubber ear hanging through the exhaust pipe is a soft connection on the car, that is, the exhaust pipe can shake to a certain extent without being transmitted to the car. All exhaust pipes are flex fixed throughout, not rigid.
That is to say all the exhaust pipes are shaking. But it shakes badly, maybe the last connecting rubber part is broken. There is vibration during the driving of the car, which will reduce the resonance and make the exhaust pipe not easy to deform. It also has a buffering effect. When the engine is working, there will be vibration and displacement.
The corresponding exhaust pipe should also be connected flexibly to eliminate vibration and noise! When I wanted to change it, I realized it wasn't easy. It turned out that the exhaust pipe was hung on the chassis through various weird rubber joints. The angle of the connection is tricky.
If the exhaust pipe is fixed on the chassis, the side connected to the engine will shake, while the other side is firmly fixed, and the middle will definitely be twisted, and the metal fatigue will definitely cause premature damage over time. Therefore, we can only hang the exhaust pipe and let it swing freely with the engine to reduce external pressure and prolong life.
Also, there is another soft connection at the head of the exhaust pipe. The inside is a metal bellow, and the outside is wrapped with a metal ribbon. This is also a flexible attachment point that dampens vibrations. It can be seen that the exhaust pipe suspension installation is undoubtedly the best solution at present. The fixed exhaust pipe you mentioned may have been thought of by someone in the early stage of development.
But after all these years, there was a pause. Why? Because most engines are not rigidly connected to the frame, but are connected through shock-absorbing feet. Of course, the exhaust pipe cannot be connected rigidly, but it can be connected flexibly. We all know that the engine and transmission are held in place with rubber. Better vehicles also have hydraulic rubber, or rubber with a motor, so when the vehicle changes gears, the engine will have a jerky motion. At this time, the engine and gearbox will move back and forth, and the exhaust manifold is connected to the engine, so it will also drive the entire exhaust pipe to move. The fixing of the rubber hook not only plays the role of shock absorption and noise reduction, but also protects the exhaust pipe. Moreover, the exhaust pipe is also the hottest place in the car. It is best to fix the exhaust pipe with a rubber hook, 32mm away from the muffler, so as not to affect the service life of the rubber due to high temperature.
As for the type of exhaust pipe, do not change it casually, because the seemingly indistinguishable pipe will actually affect NVH and performance. For example, a large-diameter exhaust pipe reduces the energy storage effect, and smooth exhaust equals efficient air intake; but if it is changed to a small-diameter exhaust pipe or dual exhaust pipes, the result will naturally be a change in flow rate and poor exhaust. So the exhaust pipe of the original car is the best choice. Suspension can reduce the vibration of the exhaust pipe, especially if the three-way catalytic converter is rigidly connected to the body, it will be broken in a short time. The steels used for gas piping and valve bodies are different.
