GENERAL KNOWLEDGE OF AUTOMOBILE EXHAUST PIPE REFITTING
Why are more and more people modifying car exhaust pipes? By modifying a large-diameter exhaust pipe, the vehicle will run faster because the replacement of the exhaust pipe will greatly improve the horsepower. Especially for some small-displacement vehicles, the only way to improve the horsepower is to modify the exhaust devices. Some people want to make their cars emit the sound or have a dynamic look, so they refit the cars.
The main purpose of modifying the exhaust pipe is to reduce the internal resistance of the exhaust gas to make the exchange of the gas smoother. There are several methods.
Make the silencer smaller
The silencer of the modified tail section is usually small, and generally modifying the middle section is to remove the silencer and just become a straight pipe.
Change the structure of the silencer
The original muffler structure is using a tube to introduce the exhaust gas into the complex metal asbestos noise-reducing and damping material, fully silenced and exported from the other end, so the exhaust of original car is very quiet. The modified exhaust muffler generally adopts a straight pipe to pass through, and the wall of the pipe is filled with a lot of holes, the outer side of the hole is sound-absorbing, thus realizing an indirect partial sound-absorbing.
Make the diameter of the pipe bigger
Increase the diameter of the pipe, which is obvious. Regarding the arrangement of the pipe diameter, from big to thin or having the same diameter is more suitable for those who pay attention to the torque. However, if you are the pursuer of the horsepower, it is suitable to adopt bell-mouth type which is gradually enlargement. The design is to gradually expand the diameter of the pipe, so that forming exhaust gas flow, especially in the case of continuous high speed operation, which is also a trend to modify the exhaust pipe.
Remove the three-way catalyst
The structure of the ternary catalyst is a ceramic honeycomb mesh. There is a ceramic structure of several tens of centimeters in a can, and there are numerous small holes. These ceramic structures are all attached to a catalyst for the conversion of harmful gases. This structure has a large blockage of the exhaust gas in order to increase the contact area between the exhaust gas and the catalyst, increase the conversion efficiency and play an environmentally friendly role. Removing the three-way catalyst and making it straight through, the exhaust will be smooth, but it is not environmentally friendly.
The purpose of above methods is to reduce the “exhaust pressure” and the exhaust resistance. Reducing the pressure of the exhaust gas will make the sound of the exhaust gas larger. Because the function of the exhaust itself is shock absorption, once the exhaust gas is smooth means the shock absorption function is weaken, so the sound is large. We all know that the sound is generated by vibration. After reading the above instructions, you must confirm the characteristics you want before modifying the exhaust pipe.
