market dynamics
How much do you know about these secrets of motorcycle exhaust pipes?
Release date:2019.06.28

The exhaust pipe is a relatively high-frequency component of motorcycle modification. I believe many people have a good understanding of the exhaust pipe. However, in the process of modifying the exhaust pipe, we can’t just be clear and clear. Know the secret, otherwise the modified exhaust pipe may cause pollution and even affect the performance of the car.


What types of exhaust pipes are divided into?

Pressure return pipe, straight pipe, and diffuser pipe. From the tail section of the exhaust pipe, the back pressure pipe maintains the overall back pressure resistance, and several cross-separators are placed inside the pipe body. This design can also reduce noise, and the original car considers environmental regulations. Most of them adopt the design of the back pressure pipe; in order to reduce the exhaust resistance, the straight pipe removes the partition inside the pressure return pipe, so that the exhaust gas can be discharged more smoothly and quickly, but the noise generated by the straight through design is often criticized.

The diffuser tube is more special in construction than the first two models. There is no obvious exit design. Instead, the exhaust gas is exhausted through the gap between the end diffusers, and the back pressure of the exhaust pipe can be adjusted through the change in the number of diffusers. resistance.


Why does the heavy car have a "beverage box"?

Lightweight, focused, and meet stringent environmental regulations. Large-displacement vehicles are subject to increasingly stringent environmental regulations, and the exhaust pipe body will be made longer and longer to facilitate the increase of the partition, but the excessively long exhaust pipe will change the vehicle in addition to the weight. The proportion of the center of gravity, and the design of the "Bague Box" moves the internal partition design of the pipe body to the middle section of the exhaust pipe to reduce the burden on the tail section. It is mounted on the bottom of the vehicle and installed together with the catalytic converter to make the center of gravity of the vehicle more concentrated.


What is the function of the catalytic converter?

Treat waste gas and reduce pollution. The catalytic converter is a catalyst containing a variety of precious metals, which can convert the exhaust gas generated by the engine into a harmless gas discharge, and the lead compound adheres to the surface of the catalyst precious metal, resulting in loss of function, so the gasoline can only use lead-free. Gasoline, as far as possible, avoid adding additives of unknown composition. In addition, the catalytic converter requires a relatively high operating temperature, so it is often designed in the head section or the middle section of the exhaust pipe.


What is the difference between just changing the last paragraph and changing the whole paragraph?

Tail segment: lightweight, sound waves, full segment: increase performance. You may often hear that some riders change their tails only when they change their tubes. But are you curious about which is better for changing the tail section and changing the whole section? The tail section is where the entire exhaust pipe is the largest and the heaviest, using texture. The lighter modified tube can effectively reduce the weight of the car body.

At the same time, through the change of the internal pipeline and the size of the caliber, the sound of the exhaust pipe can also be changed; and the exhaust pipe of the whole section can be changed, and the overall engine output can be effectively increased through the re-adjustment of the computer, although the tail section is changed. It can also increase performance, but the increase will not be better than the whole segment. Therefore, if you want to improve the performance of the riders, you can consider changing the whole section when you change the tube.


What are the benefits of a small speed Keda modified intubation?

It is convenient to change the oil and the tail section has a variety of options. Because the exhaust pipe required for large heavy trucks is relatively large, if the integrated system is much more complicated in the process, most of them adopt the intubation design. However, what are the reasons for some manufacturers to introduce the intubation used by the small speed Keda? In the case of a small speed Keda oil change every thousand kilometers, the intubation is quite convenient when changing the oil. In addition, the intubation can also have more options in the tail section configuration.


The larger the diameter of the exhaust pipe, the greater the horsepower?

Not necessarily, the larger the diameter of the exhaust pipe, the greater the horsepower. From the perspective of fluid mechanics, the exhaust gas is imagined as a water flow, and the exhaust pipe is a waterway. If the water channel is too small, the water flow will be blocked, and the engine efficiency will decrease. However, if the water channel is too wide, the water flow will be everywhere in the waterway. The flow causes eddy currents and counter effects, and engine efficiency still cannot be improved.

To put it simply, when the engine is at high speed, a relatively unobstructed exhaust environment is required. At low speeds, it is desirable to reduce the piping to increase continuity. Therefore, the exhaust pipe is not designed to be coarser and smoother. Power output can be improved.


Why do some heavy vehicles install exhaust valves?

Achieve better exhaust efficiency, cope with environmental regulations, and reduce noise. Lift 2017 HONDA CBR1000RR

For example, a valve is provided at the end of the exhaust pipe to control the back pressure of each speed range through the opening and closing of the valve, so that the engine output can achieve the best efficiency.

Although the official mains increase engine efficiency, it is mainly used to control the exhaust and noise volume in response to environmental regulations, in order to pass strict environmental regulations.


What materials are there for the exhaust pipe?

Iron, stainless steel, carbon fiber, titanium alloy. The outer layer of the iron pipe is treated with black heat-resistant paint, commonly known as "black iron pipe". The low cost characteristics are favored by the manufacturers. However, the black iron pipe is prone to rust and the heat dissipation performance is insufficient, so more attention needs to be paid; Known as "white iron pipe", it has higher durability and thermal conductivity than black iron pipe, and the price is not too expensive, so many modified pipes are made of stainless steel.

Carbon fiber tube and titanium alloy tube can achieve the weight reduction effect of the car body, and the unique color of carbon fiber attracts the love of many riders. The anti-scalding effect is better than the general metal tail pipe. Due to the material characteristics, At present, the carbon fiber tubes are all made into the tail section and cannot be used in all sections. Titanium alloy materials can be found on aerospace materials. It is conceivable that their strength and light weight performance are quite excellent, but the price is relatively expensive, and many on the market. The titanium alloy exhaust pipe is not made entirely of titanium alloy. Some of them are made of stainless steel in the front section. Titanium alloy materials are used in the tail section. In addition, the riders should pay attention to some exhaust pipes that are marked with titanium alloys. The white iron tube is plated with titanium or colored titanium to burn it, so pay special attention before purchasing.