In the design process, comprehensive consideration is needed. First of all, on the basis of the original exhaust manifold, the new exhaust manifold interface size should be designed to ensure that the new exhaust manifold can be normally connected to the other end, so as to avoid the subsequent adverse effects on other parts and joints of the equipment. At the same time, considering the actual requirements for the installation and manufacturing of the new exhaust manifold, it is also necessary to optimize the design of the flange surface of the manifold, so as to ensure that the new exhaust manifold can adapt to the new airway after installation, and leave sufficient space for bolt installation tools.
However, in the new exhaust manifold optimization process, the influence on the three-way catalytic converter spatial position is small. Therefore, there is no need to change the space position and interface of the three-way catalyst, and the original design is still used. The advantage of this method is that it can make the equipment maintain a faster start-up time of the three-way catalyst and improve the operation efficiency. For the design of the branch pipe, we need to consider the direction of the air flow, not only to ensure that the flange bolt installation has enough space, but also to consider in the subsequent construction process, can facilitate the implementation of the process.
Therefore, the overall length, angle, radius and other contents of the branch pipe of the exhaust manifold should be optimized, and the final position of the branch pipe should be unified, so as to ensure that the length of each branch pipe is basically the same when it finally joins the main pipe. Otherwise, the velocity uniformity of exhaust gas flowing into the three-way catalytic converter will be adversely affected.