If take off the sound attenuation in the car's exhaust bearing, what situation? - bearing knowledge

With the development of economy a lot of people into buying a car, but a lot of people though is bought cars of their own, but when it comes to car maintenance is not very understanding, maintenance is also has a lot of knowledge about the car, a lot of people buy cars are only considered the car's fuel consumption and the size of the space, so as long as the car there is a problem often will choose to go to 4 s shop repair, then also make himself on the pit, recently had a net friend message; If take off the sound attenuation in the car's exhaust bearing, what situation? Back pressure, also known as Back pressure, and in some car racing game, the Chinese version, there is a kind of exhaust pipe was translated into 'Cat' type exhaust pipe, actually surprised this translation, the meaning of the Cat is not a Cat here, ternary catalysts, and the Back is the meaning of the Back, is refers to the Back pressure of exhaust system. Back pressure and back pressure, is must exist, in theory, the greater the back pressure of automobile exhaust system, the stronger the exhaust noise control capability, at the same time, exhaust resistance. And the greater the noise, but the less exhaust resistance. Back pressure is set up on the road through the exhaust muffler, surface muffler is a steel cylinder or drum shaped object, inside is a lot of clapboard. Inside the exhaust pipe is mainly silencer and three yuan catalysts two things, if you all take out, the equivalent of exhaust gas directly discharge into the atmosphere, so that the first is voice roar, and helicopters, almost ten thousand people attention when crossing the street, I'm afraid you can't stand, the police sorghum will find you soon. Followed by the power will be increased, a lot of sports car is such change, finally is directly out of the other environmental pollution, why there are big and small car exhaust pipe and silencer, have thick have thin? This is determined by the engine exhaust! Why can't a silencer do infinite? This can greatly reduce the exhaust noise, isn't it? High speed, the valve closing time is very short, cavitation has little chance of existence, so also don't need too much waste gas reserves, then quickly ruled out waste gas is the first priority. And huge volume of muffler becomes encumbrance at this moment, there is great resistance, this is the back pressure is too large. Here can evolve to a hot-rod exhaust pipe, automobile exhaust pipe of the basic is to use the car's exhaust system, in addition to some of the diesel engine of the car, most of the gasoline car engine speed is commonly used in more than 6000 r/min, for mass production car that is already the highest speed, so the car's exhaust system does not need to consider how low speed.