Car engine as the power source of the car, its performance directly determines the overall performance of the car.The car engine, the performance of the high and low, not only depend onOil supply system, ignition system, electronic control system and so on, and inlet and exhaust system as two keeper in charge of the engine lifeblood, if appear problem, the engine can not work normally, impact performance.But for many owners, they are more concerned about the appearance of the car is complete, rarely on in-depth research with the car's exhaust system, if you want to study, I'm afraid is the exhaust end of the mouth.Automobile exhaust in appearance, after all it is hard to see the inside structure, at the same time, a lot of people think that the exhaust pipe as long as it doesn't jam is working properly.
Automobile Exhaust System (Exhaust System) general by the Exhaust manifold (Exhaust plantain), three yuan catalysts, sound drum drum (tail), Exhaust pipe, etc, the design of each part of the it is very exquisite, one to more《Tail drum nature of deconstruction》。
Figure in the large cylindrical structure is the tail drum, the appearance of common tail drum has a lot of, but they are pipe is larger than exhaust system, can easily recognize it.
This time in order to let everybody to know deeply, tail drum and unravel the mysteries of the exhaust system, we are a factory tail drum, and the modified tail drum and dismantling.
As shown in the above the tail drum is a typical design of back pressure, exhaust pipe into the tail drum from (1) first, and quickly filled with tail drum rear exhaust chamber (2), due to the gas chamber is closed, waste gas can only be returned to the original road, in the middle of the pipe (3) the holes flow into the gas chamber (4), after the exhaust gas to flow through the grid (5) to the exhaust pipe mouth 6, finally from the exhaust pipe 7 drum discharge end.
Original tail drum in appearance is how simple, if not singly, believe you also think that the original exhaust gas flow is so complicated!Although such complex linear design can have a good back pressure effect, to improve the engine's low rangeTail drumHow is it?
Graph: the design of small make up according to the modified tail drum for 3 d modeling, size is not accurate, but can be modified tail drum of the structure and principle of the express it clearly.
Look from the modified tail drum design, engine exhaust gas from the pipe into the red tail drum, and then the blue pipe discharge, and the tail drum filled with sound-absorbing cotton, conceal note that around the tail drum in the exhaust pipe design, cancelled the original tail drum airtight chamber, through the plug the silencing cotton and extension of the vent line to reach back pressure effect.Compared with the original tail drum, exhaust resistance have fallen sharply, is beneficial to the dynamic properties of high engine speed range, but the effect of back pressure decreases, this means that the engine is lowtorqueWeakened.
Graph: modified tail drum anatomy.
Graph: audi Q5 modified tail drum scene shooting.
Conclusion:By comparing the original exhaust and modified exhaust tail drum, we can easily draw the conclusion: for general economy cars, the original exhaust will be fully considered in the design to the roar of the exhaust, low engine torque, this would increase the exhaust resistance, deliberately designed so that, although the low speed torque are of great help to improve engine, however, will greatly impairs the development of the high speed.While modified exhaust can match different kinds of tail drum, to meet the needs of the various driving habits, if you need to lower output, can be converted a back pressure value (exhaust resistance) of the exhaust, and need high output, can be adapted a small exhaust resistance.
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