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Flowline Fluid Control And Manifold Products Into The Exhaust Manifold
Jun 13, 2017

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Flowline Fluid Control and Manifold Products Into the exhaust manifold

Exhaust manifold, is connected with the engine cylinder block, the cylinder of the exhaust together into the exhaust manifold, with different lines. The main requirement is to minimize the exhaust resistance and to avoid mutual interference between the cylinders. Exhausted too concentrated, the cylinder will produce mutual interference, that is, a cylinder exhaust, just hit the other cylinder channeling did not discharge the exhaust gas. This will increase the resistance of the exhaust, thereby reducing the engine output power. The solution is to separate the exhausts of each cylinder as much as possible, one branch per cylinder, or one branch of the two cylinders, and make each branch as long as possible and independently formed to reduce the interaction of gases in different tubes.


Exhaust manifold is connected with the engine cylinder block, the cylinder exhaust together into the exhaust manifold, with different lines. The main requirement is to minimize the exhaust resistance and to avoid mutual interference between the cylinders. Exhausted too concentrated, the cylinder will produce mutual interference, that is, a cylinder exhaust, just hit the other cylinder channeling did not discharge the exhaust gas. This will increase the resistance of the exhaust, thereby reducing the engine output power. The solution is to separate the cylinders as much as possible, one branch per cylinder, or one branch of the two cylinders, and make each branch as long as possible and to shape - to reduce the mutual influence of the gases in different tubes. In order to reduce the exhaust resistance, and some cars using stainless steel pipe manufacturing exhaust manifold.


Exhaust manifolds should take into account engine power performance, engine fuel economy performance, emission standards, engine cost, matching vehicle front cabin layout and temperature field.

Currently widely used exhaust manifold from the material and processing technology is divided into cast iron manifold and stainless steel manifold two types.

Characteristics and requirements of exhaust manifold materials


The early car engine, the unit weight of the power is low, the fuel combustion efficiency is not high, the exhaust gas temperature is not more than 500 ℃. With the improvement of the efficiency of the automobile engine, the exhaust temperature is increased to 600 to 650 ° C. Developed countries in recent years continue to improve the vehicle exhaust emission standards, catalytic technology and the use of worm turbocharging technology is significantly improved the exhaust manifold operating temperature, reaching more than 750 ℃. As the engine performance is further improved, the operating temperature of the exhaust manifold is increased. At the same time, with the progress of the engine technology, the structure of the exhaust manifold is also complicated, coupled with the work of alternating alternating temperature conditions, requiring exhaust manifold material not only to have good high temperature performance, but also with Good casting performance. Therefore, the exhaust manifold material must have the following characteristics.


Exhaust manifold long-term high temperature cycle in the alternating state of work, the material at high temperature oxidation resistance directly affect the exhaust manifold life. Ordinary cast iron is clearly unable to meet the requirements, the need to add alloying elements in the material to improve the high temperature oxidation resistance of the material.