Stuffing steel balls into the exhaust pipe may lead to the following consequences:
1. Idle speed increases.
2. Increased fuel consumption.
3. It is easy to cause carbon deposition in the engine.
4. Increase the load of three-way catalytic converter.
5. The engine body temperature rises.
It turns out that fresh air, mainly oxygen, is inhaled in the intake stroke. However, due to the back pressure mode of the steel ball plug behind the exhaust pipe, the air inhaled in the intake stroke is not all fresh air, and a considerable part is the exhaust gas generated after the last working stroke. At this time, the amount of oxygen inhaled in the air is definitely insufficient.
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Automobile exhaust bellows, also known as automobile exhaust hose, is installed in the exhaust pipe between the engine exhaust branch pipe and muffler, which makes the whole exhaust system flexibly connected, thus playing the role of vibration and noise reduction, convenient installation and prolonging the service life of the exhaust muffler system. It is mainly used in light cars, mini-cars and buses. Its structure is a double-layer corrugated pipe, covered with steel wire mesh sleeve, and the straight edge sections at both ends are covered with snap rings. In order to make the noise elimination effect better, an expansion joint or a net sleeve can be arranged inside the bellows.
Material: The main material is stainless steel SUS304, and the sleeve and nozzle can be made of stainless steel or aluminized steel.
Reasons why ferritic stainless steel becomes the first choice material for automobile exhaust pipe;
1) ferritic stainless steel contains no or a small amount of precious metal Ni, so the raw material cost is low;
2) Ferritic stainless steel has small thermal expansion coefficient, high thermal conductivity, good high-temperature oxidation resistance and good pitting corrosion resistance under repeated heating and cooling conditions;
3) Compared with austenitic stainless steel, ferritic stainless steel has better chloride resistance, stress corrosion resistance and intergranular corrosion resistance;
4) Ferritic stainless steel stabilized by 4)Nb and Ti has excellent creep resistance;
5) Ferritic stainless steel has small elasticity during cold forming.
References:
Baidu encyclopedia entry: automobile exhaust pipe web page link