The first reaction of many riders to get the car is to modify the exhaust. I feel that the sound of the original exhaust is really not enough, and the appearance is not enough. I can change the straight line I like to find the feeling of riding a motorcycle.
Then the question is coming, why is the original exhaust sound relatively small? Originally, in order to comply with the regulations for reducing noise pollution, the original exhaust gas is mostly a back pressure exhaust that can reduce noise. Of course, the manufacturer installs the back pressure exhaust.
Back pressure exhaust
The sound is transmitted by the air vibration. In order to reduce the sound, the air cylinder is pressed back, and a lot of chambers are designed. The exhaust gas from the engine will not be discharged from the exhaust gas smoothly, and will be placed in the interlayer. Silence cotton to reduce the frequency of vibration.
However, there are some drawbacks in the back pressure exhaust. Because the chamber will hinder the airflow, when the exhaust gas is exhausted, the exhaust gas will not be smooth at the high speed of the cylinder, and some high-speed torque will be lost.
However, the back pressure exhaust will have some improvement on the low twist speed. At low speed, when the exhaust flow is not large, the exhaust is very regular. There will be gaps in the middle of the exhaust gas to form a negative pressure. When the cylinder is exhausted next time, the negative pressure can absorb the next wave of exhaust gas faster.
2. Straight through exhaust
Straight-through exhaust is very well understood, that is, there is no cavity obstruction in the middle, and the exhaust gas is directly discharged from the hollow exhaust gas. This exhaust sound is very loud, but for the pursuit of sound, this exhaust is also the most Cool, but this exhaust is also the most attractive to the police uncle.
The characteristics of the straight-through exhaust are completely opposite to that of the back-pressure exhaust. When there is no chamber at low speed, the exhaust is smooth, and the low-torque does not increase the negative pressure. The low twist is not as good as the back-pressure exhaust. The speed is the time when the straight discharge is exerted, and the resistance of the discharged gas is not large, and the power is increased at a high rotation speed.
3. Half back pressure exhaust
After seeing the above two exhausts, the half back pressure exhaust is well understood. Between the back pressure and the straight row, there are not so many chambers to block the circulation of air, and not as big as the straight noise. At the mid-tail speed, the semi-back pressure exhaust has certain advantages.
The semi-return venting, straight-line and back-pressure venting mentioned above belong to the tail section of the exhaust. I want to change the appearance and sound size simply. It is enough to change the tail platoon. Will consider changing the middle section or changing the entire section of the exhaust.
Middle section
In fact, the most important thing is to take the catalyst down. The catalyst is honeycomb-shaped and composed of various precious metals. The role of the catalyst is to filter the harmful gases in the exhaust gas into harmless gases, and change the medium to remove the catalyst. Make the exhaust smoother and improve the power.
Full section
The whole section of exhaust is changed from the engine port. In fact, this modification is for the lighter weight of the car, and it is replaced with a lighter and better material. After changing to the all-pass, it is necessary to reset the computer's oil supply system. School supply ratio.
Exhaust material
The price of each car is different and the use is different. Therefore, the exhaust pipe of each car is different in materials. The performance car will pursue lightweight, and the same class of car will be replaced with a material that is exhausted. More expensive and lighter materials are very valuable.
Iron exhaust
The cheapest material, made of black heat-resistant treatment on the outer layer of iron, has low cost and is the favorite material of many manufacturers. This kind of exhaust is easy to rust and has poor heat dissipation performance.
2. Stainless steel exhaust
Stainless steel exhaust is an upgraded version of iron exhaust, the price is more expensive than iron exhaust, but the heat dissipation performance will be much better, the inside will add chromium to make the steel form a rust-proof oxide film, but the weight is also unsatisfactory.
3. Titanium alloy exhaust
Exhaust gas using titanium alloy is very common in modification. Titanium alloy exhaust gas is light in weight, heat resistance is very good, strength is also very strong, and the exhaust gas can be burned colorful by temperature. Titanium alloy is often used in aviation business. Use, can see the advantages of titanium alloy materials, but the price is very expensive, generally only use titanium alloy in the tail section, the front section still uses stainless steel to reduce the budget.
4. Carbon fiber exhaust
The carbon fiber material has a very strong tensile strength and even exceeds that of steel, so it can reach the required strength with a small amount of material, so the weight is also the lightest, but it can only be applied to the tail section. Due to the special carbon fiber material, it is heat resistant. The degree can reach a high temperature of 1000~1500°, and the anti-scalding and heat dissipation effects are excellent.
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