Motorcycle, scooter related

Motorcyclists usually find that when they are on the road, the exhaust pipes of some motorcycles will emit smoke and the smell is very pungent! Under normal circumstances, the common smoke among Mo friends is nothing more than "black, white and blue" smoke. But do you know why motorcycles are like this? In fact, there is a reason!

Black smoke

In the case of black smoke, in fact, Mo friends do not have to panic! When the motorcycle starts, a puff of black smoke comes out from the exhaust port, and there is a slight smell of gasoline, which is more obvious when you give it oil! This is a typical failure of carburetor models, because the mixing ratio is adjusted too rich, which leads to insufficient gasoline combustion in the cylinder!

There is another situation that the spark plug is not working properly. It is recommended that the friend with strong hands-on ability unplug the spark plug and check the color of the spark plug! If the spark plug has serious carbon deposits, it is recommended to clean it or replace it directly!

In the process of driving, the exhaust pipe emits black smoke and the fuel is "fired" or the fuel is cut off! In fact, the crux is still in the carburetor, it is recommended to find a master to adjust the carburetor!

White smoke

White smoke from motorcycles is generally not common! Usually due to the large temperature difference between morning and night, when the motorcycle starts, the muffler emits white smoke similar to water vapor! This is because the fuel of the motorcycle, or the unevaporated water in the cylinder and exhaust pipe!

But if your motorcycle keeps emitting white smoke, it is definitely a problem with your oil product. The excessive moisture in the gasoline is caused by it. It is recommended that motorcyclists choose regular gas stations for refueling. Private gas stations mix with gasoline. There are still many situations!

Blue smoke

Blue smoke is commonly known as "burning engine oil". The motorcycle exhaust pipe emits thick blue smoke, and the smell is pungent and spicy eyes!

When motorcycle friends discover blue smoke from motorcycles, don't panic. They conclude that the motorcycle is pulling the cylinder. In fact, there are many reasons why motorcycles emit blue smoke!

First of all: If the motorcycle exhaust pipe emits blue smoke, the first step should be to check whether the engine oil has been added too much. It is recommended to check whether the oil level is high with the oil dipstick after 10 minutes of flameout. If the oil level is high, it is recommended to release the excess oil. Just oil!

If the amount of oil is normal, the engine cylinder and piston should be checked. This should be done at the place where the motorcycle is repaired. If the wear gap between the piston and the cylinder wall increases, then the piston needs to be cleaned or replaced (a major project ). 

Is it a disease to change the exhaust when buying a car? Take you to understand the exhaust classification

The most controversial modification in locomotive modification must be the exhaust pipe. I often see news and netizens who have many complaints about the noise of the exhaust pipe. Is it true that changing the exhaust pipe will really equate the noise with the noise? Let's take a look together.

Modified exhaust pipe recognition

The modification of the exhaust pipe is very popular with the majority of riders. The modified exhaust pipe is not only very eye-catching in appearance, but also the charming sound makes people feel refreshed when riding a bicycle. Is it only the function of changing the appearance and sound? In fact, it is not the case. In addition to the external upgrade, the modified exhaust pipe can actually improve the internal locomotive performance. The exhaust pipe is not just a special purpose on the appearance. The exhaust pipe used to discharge exhaust gas actually contains many components and design eyebrow angles. Changing the design of the exhaust pipe can not only modify the original power curve, but also change the torque and horsepower peaks of the original vehicle. It is also possible to achieve the effect of lightweight car body by changing to lighter materials. That's why many riders describe their comments that the torque of the car has become larger and the tail speed is higher after changing the exhaust pipe.

Nowadays, due to the noise problem of exhaust pipes, the government pays great attention to banning the modification of exhaust pipes on locomotives. Many exhaust pipe manufacturers on the market will also go to government agencies to inspect and certify the noise of the exhaust pipes, so how to choose one It’s very important to fit your own exhaust pipe. Let’s take a look!

Exhaust pipe type introduction

Back pressure tube

Generally, the original exhaust pipes on the market will be designed with many compartments in the exhaust pipe. This design can use the generated back pressure to shorten the interval between the exhaust gas groups after the explosion in the engine, and then make the exhaust gas due to the negative pressure in the middle. Pull forward to improve the exhaust efficiency. This design can increase the torque at low speeds, and the sound-absorbing material is also painted between the partitions to reduce the noise of the exhaust, but the blocking partition will hinder the flow of air. , It can’t be discharged smoothly at high revolutions and the air mass is too dense, thus losing the torque in the high revolution range.

Straight tube

Contrary to the back pressure pipe, the straight pipe is named after the exhaust pipe with no obstruction in the middle. This design allows the air flow to flow smoothly and quickly in the pipe, so it cannot produce the traction effect like the back pressure pipe at low speeds. , Which makes the low-turn torque slightly weaker, and the exhaust noise is not blocked and very loud. However, because the air mass can be smoothly and densely discharged at high turns, it can produce a traction effect such as the return pressure tube at low turns. Can be more powerful at high turns.

Black iron

Exhaust pipes made of medium-carbon steel are sprayed with a black heat-resistant paint to avoid rust after production. Because of their cheap and easy-to-maintain characteristics, the original factory pipes usually use this Material production.

White iron

The exhaust pipe made of stainless steel is not easy to rust, so it can be lighter and thinner than the black iron pipe in the depth of the pipe, but the protective layer on the surface of the pipe body will change color due to high temperature and other factors, so it needs to be used after a period of time Polishing is performed to maintain the bright silver color. Modified tubes are usually made of this material.

titanium

Titanium tubes are divided into pure titanium and titanium metal. Because titanium has lighter weight, high hardness, corrosion resistance and other characteristics, but due to the high cost, it is usually only used in high-end competitions and modified tubes. Titanium metal will produce beautiful colors after high temperature, which is one of the reasons why titanium tubes are still sought after by many car users even if they are expensive.

carbon fiber

Carbon fiber is also divided into two production methods: pure carbon fiber and carbon fiber coating. The weight of pure carbon fiber tail pipe is very light. In addition, due to the slow heat conduction, even if it touches the skin after use, it will hardly burn like a traditional exhaust pipe. However, due to the complexity of the manufacturing process and the amazing price, the carbon fiber coating method is used to wrap the carbon fiber on the outer layer of the metal tube, so that riders can buy the charming card spring pattern at a lower price.