Where is the exhaust pipe of the car?
Second, cars with large displacement generally have more exhaust pipes. Displacement is one of the manifestations of automobile dynamic performance. But it doesn't mean that the more exhaust pipes, the faster the car. Some heavy vehicles, such as trucks, buses or off-road vehicles, use high-power and high-speed engines, although they have large displacement and many exhaust pipes.
But the top speed may not be as fast as other cars. For cars and sports cars, exhaust pipes can explain some speed problems. Generally, a four-cylinder engine car has one exhaust pipe (plus two turbines), a six-cylinder car needs two exhaust pipes, and so on. , depending on the displacement.
The main function of exhaust pipe is to reduce the noise and pollutants emitted by engine.
The exhaust system of a car is very complicated, not just a pipe. The core components are three-way catalytic converter and muffler. The three-way catalytic converter can convert harmful gases such as CO, HC and nitrogen oxides in automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction.
When the high-temperature automobile exhaust gas passes through the purification device, the purifying agent in the three-way catalyst will enhance the activity of CO, HC and nitrogen oxides, prompting them to carry out certain redox chemical reactions, in which CO is oxidized into colorless and nontoxic carbon dioxide gas at high temperature; HC compounds are oxidized to water (H2O) and carbon dioxide at high temperature; Nitrogen oxides are reduced to nitrogen and oxygen. Three kinds of harmful gases are changed into harmless gases, thus purifying automobile exhaust.