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Reason of different shape of exhaust manifold

Update:14 May 2020
Summary:

The exhaust gas generated after the engine is combusted […]

The exhaust gas generated after the engine is combusted needs to be discharged from the cylinder in time. The role of the exhaust system is to exhaust the exhaust gas after combustion from the cylinder to the atmosphere as soon as possible. Explorer, etc.

The exhaust manifold is the first thing encountered during engine exhaust emissions.

Due to the relatively short distance between the exhaust products, if they interfere with each other or the exhaust gas recirculation phenomenon, it will inevitably affect the smoothness of the exhaust of the engine, which will affect the power performance.

Therefore, for sports cars, racing cars, etc. that pay special attention to dynamic performance, they all design the exhaust manifold very strangely.

However, the seemingly chaotic exhaust manifold design contains several important principles.

The exhaust manifold of each cylinder is as independent as possible;

The exhaust manifold length of each cylinder is as equal as possible;

The length of the exhaust manifold is as long as possible;

The inner surface of the exhaust manifold is as smooth as possible to prevent turbulence.