The exhaust manifold is an important part of the exhaust gas from each cylinder of the engine to the outside of the vehicle. The efficiency of the exhaust system depends on the design of the exhaust manifold.
The exhaust manifold is composed of the exhaust port installation seat, the manifold pipe line, the manifold junction and the combined installation seat. The exhaust manifold of the general model is cast with cast iron. The biggest drawback is the heavy weight, poor durability, and the serious interference phenomenon of the unequal length of the pipeline, which greatly reduces the efficiency of the exhaust system.
Secondly, the most important step in improving the efficiency of the exhaust system is to replace the high performance exhaust manifold. The so-called high performance exhaust manifold is the exhaust manifold made of stainless steel material with good heat resistance and good corrosion resistance. First, the high quality exhaust manifold's outlet mounting seat is cut by the CNC CNC lathe, and the precision of the exhaust manifold is made. High degree of degree can prevent the occurrence of gas leakage.
In line processing, there are two kinds of methods, the general model is made of whole tube bending, and then the pipe is welded on the installation seat. The advantages are that the inner wall is smooth and the exhaust resistance is low and the weight is light. The shortcoming is that the pipe diameter is easy to die in the bending process. It is difficult to design the pipeline with the pure equal length exhaust manifold with multi length and multiple curvature. And the welded pipe is a pre designed mold as a reference, cutting out the different angles and different lengths of the pipeline, each pipe is welded one by one and the weld line and the inner wall of the pipe are highly polished. Although the welding exhaust manifold can be designed with pure and equal length, it has high requirements for the design of welding technology and pipeline position, and it needs a comprehensive inner wall polishing to achieve the inner wall of the inner wall of the curved pipe. Therefore, the high quality welded pipe manifolds will be much more expensive than the bent exhaust manifold.
The combination of the manifold is divided into two kinds of 1 and 2 - 1 design. The former pays attention to the design of high speed power output, while the latter emphasizes the design of the torque output of low speed. The highest exhaust efficiency is the multi - one design, the general multi - Product joint part is a simple funnel shape, the disadvantage is that the exhaust gas can not be discharged evenly after the exhaust of the manifold, and it is easy to cause the occurrence of the exhaust interference. The combination of the exhaust manifold developed by the car exhaust system is a spherical expansion chamber structure, which can make the exhaust gases discharged evenly and steadily, prevent the occurrence of exhaust interference, and greatly improve the exhaust efficiency.
In recent years, there are also high performance exhaust manifold made of titanium alloy. The biggest advantage of titanium alloy material is the strength and light weight. It can achieve greater strength and lighter weight than stainless steel with very thin thickness. Moreover, titanium alloy material has stronger heat resistance and can achieve better thermal expansion performance. Increasing exhaust temperature step by step can greatly improve exhaust efficiency.