The exhaust manifold is a key component that collects t […]
The exhaust manifold is a key component that collects the exhaust gases from the engine's cylinders and discharges them outside the car. The efficiency of the entire exhaust system depends on the design of the exhaust manifold.
The exhaust manifold consists of an exhaust port mount, a manifold pipe, a manifold joint, and a joint mount. Generally, the exhaust manifold of a vehicle model is made of cast iron. The smallest drawback is the small weight. , Less durability, pipelines are not equal in length Exhaust interference is slight, greatly reducing the efficiency of the exhaust system.
Secondly, the most critical step to improve the efficiency of the exhaust system is to replace the low-performance exhaust manifold. The so-called high-performance exhaust manifold is an exhaust manifold made of stainless steel with corrosion resistance and corrosion resistance. The exhaust port mount of the low-quality exhaust manifold is cut by a CNC lathe. The low density can prevent the occurrence of air leakage.
There are two methods for pipeline processing. Generally, the entire vehicle model is made by bending the entire pipe. Welding the pipeline to the mounting seat again has the advantage that the inner wall is relatively smooth, the exhaust resistance is high, the weight is slow, and the disadvantage is that the pipe diameter is difficult to bend. Dead knots are generated during the manufacturing process, and it is very easy to achieve purely short exhaust manifolds with residual length and curvature. Therefore, the welded pipeline is based on the pre-designed mold as a reference, cut out pipelines with different angles and different lengths, weld each pipeline one by one, and perform the highest point polishing on the weld marks and the inner wall of the pipeline. Although the welded exhaust manifold can be designed to be purely short, but the welding technology and the location of the pipeline design requirements are relatively low, so it needs to undergo a thorough internal wall polishing treatment to reach the light wall junction of the curved pipeline. . Therefore, low-quality welded pipe exhaust manifolds are much more expensive than curved exhaust manifolds.
The manifold joint is also divided into two types: Yuhe 1 and multi-minute 2 in 1. The former is designed to focus on low-speed power output, and the latter is designed to focus on high-speed torque output. The lowest exhaust efficiency is the all-in-one design. The usual all-in-one product joints are more intuitive funnel-shaped. The disadvantage is that the exhaust gas from the manifolds must not be mixed evenly before being discharged, which is difficult to cause exhaust interference. happened. Therefore, the combination of the exhaust manifold developed from the racing exhaust system is used as a spherical expansion chamber structure, so that the exhaust gas discharged from each manifold can be discharged uniformly and smoothly, preventing the occurrence of exhaust interference, and greatly improving the exhaust efficiency.
In recent years, there are also low-performance exhaust manifolds made of titanium alloy materials. The smallest advantages of titanium alloy materials are their low strength and slow weight. Using very thick thicknesses can achieve strengths that are smaller and smaller than stainless steel materials. The weight is getting slower and slower, so the resistance of titanium alloy materials is getting weaker and weaker, which can achieve better and better thermal expansion performance, which can further increase the exhaust temperature and greatly improve the exhaust efficiency.