How to "release the gases?

Muffler, as we know, was invented not by the good life. Velocity of the flow of exhaust gases from the engine is quite high, and increases, respectively, the growth speed. In order not to become deaf, especially in large cities, mufflers were installed on the machine as much since 1894. Today, the number of cars in big cities is enormous power and resourceful motors increases, the system for noise reduction are improved. There is a systems issue and the pros and cons. Disadvantages are well known. Engine power at difficulties in the production falls, so the race cars are generally not equipped mufflers. Modern production bites per five, and then maybe more. On the other hand, the comfort of travel is worth it. There is also such a thing as tuned exhaust tract. Used mainly manufacturers of expensive cars. Gas - inertia thing and immediately withdraw from the cylinder, even with substantial pressure difference can not. Non-ideal shape of the combustion chamber and valves protruding create turbulence, causing the rate of gas flow section is different. In the usual design of the exhaust tract manufacturers try to reduce the zone of turbulence, thereby creating the conditions for exclusion of turbulence and to increase the overall speed. Tuned exhaust tract is working on a different principle. The exhaust manifold has a complex, specially counted form, passing through which the gases at some point create a surge - the pressure differences. If everything is counted correctly, at the opening of the exhaust valve in the exhaust manifold is a negative pressure (at certain speeds), which will help not only clear that the cylinders, but also due to the overlap phase of the intake / exhaust valve to fill the combustion chamber a fresh charge of fuel mixture. However, it is expensive to manufacture, final consumer price will not be pleased. On line 6-cylinder engines M-Power from the BMW exhaust manifold recall known sculpture "Lakoon and his sons, overgrown with snakes" Agesandra, Polydor and Afinodora. But the sports car - a thing not available to everyone, as well as its content. If we talk about workers having at their disposal an inexpensive foreign-made car, the problem of replacing and restoring silencing transferred to another plane. Since the beginning of the fight for the environment appeared more detail the exhaust tract - catalytic converter exhaust. This - the most expensive element of the exhaust system, in its composition may be present precious and rare metals, ceramics. In order to neutralize the remnants of harmful substances, the catalyst needed to warm up to a certain temperature. It was then that some automakers' went too far, placing it perilously close to the cylinder head. Simply put, hanging just below the header. All would be good only at certain speeds pressure pulsation, positive and negative, albeit small, but there is. If the catalyst is correct - well, the engine is not threatened. But as you know, in Russia, high-quality gasoline is no different. Therefore, selling these cars in the Russian market, large and respected concerns encountered an unexpected problem. Exhaust gases from razbodyazhennogo knows what gasoline destroy ceramic honeycomb catalyst, the pieces of pottery (the same sand), are drawn into the engine pulsation, good motor, is now very close. Further, it is clear - major repairs. A huge number of calls to guarantee service harms the image of the manufacturer, and in general business. Urgent development of new catalysts based Russian realities, held recall campaign. Our skilled craftsmen, especially on old foreign cars, are struggling with converters in their own way. The most common repair is carried out with a crowbar - a strong blow knocked often fused and having a strong resistance to the issue of height. Well, if the oxygen sensor on the testimony of the state of the catalyst is not affected, otherwise have to reprogram the control unit. Not everyone is under force. By themselves, the noise reduction system are evolutionary changes, but not very significant. Typically, they consist of two parts, directly reduces background sound car. The first part, which is beyond the catalytic converter is popularly called the "resonator" - reduces the noise level is not so much, but it balances the pulsation of exhaust gases. A second, larger part of the common people "barrel", quenches the residual noise. Incidentally, the playing characteristics of the resonator, which removes low-frequency sound spectrum, and "barrel", suppressing the high sounds, you can get a juicy "sports" sound even on budget cars. Such things do serious tuning company. Cost options, usually meant by a primitive "forward flow", welded stainless steel in a nearby basement. Generally, the exhaust system of the car suffers from a maximum of troubles that are available for riding. Hot exhaust gases heat the exhaust path to high temperatures, then all it is cooled with ice water from a puddle. Nevertheless, silencers modern cars are very long. When it comes time to still change, you can use the standard advice, suitable for such cases. If the gases found a way out of the hole caused by mechanical damage, it is possible to solve the problem by welding. If the hole was formed as a result of dilapidation of all elements, Brewing pointless - enough for a week, the overpressure will find a new thin spot. All of these asbestos tape, cutting-edge compositions for repair - a waste of money and time. Assessing the state of issue as a whole, must make a decision - to change everything in whole or in part limit. Especially not advise saving, permanent repairs exhaust. If the car has already withdrawn from the market, I recommend to look at the unoriginal spare parts of good quality. The leader then I would call the company Bosal. Maybe in the form of products of this manufacturer unprepossessing (rough welds), but the thickness of metal is often more than the original silencers. What is called "set and forget". In general, selecting neoriginal to replace the exhaust system fully, I recommend buying all of one manufacturer that did not have to customize the length of the pipe. Take Bosal - hence Bosal, Walker - means all parts of Walker, etc. Do not forget that in addition to pipes, there are also fasteners and gaskets. When dismantling the old release will not be able to save anything, bolts for a dozen years of constant heating and cooling has long fused with flanges muffler, so I recommend to stock up and mounting hardware. Summarizing, we can say that for everything in this world has to pay, including for the silence. But the price - does not mean overpay.