The intake manifold and the exhaust manifold

Intake manifold and exhaust manifold

The intake and exhaust manifolds are very important pieces for the operation of the engine. Depending on the design and material they are made of, they can give very different characteristics to the same propeller. For example, a variable intake manifold affects points as important as the power with respect to a normal one.

With the exhaust manifolds the same thing happens , as well as with the rest of elements of the gas emission system. You only have to see the work of trainers like Brabus, to realize that they are pieces that should be replaced if you want to increase the performance of an engine at certain levels.

Admission Collector

For an internal combustion engine to work properly, you need a abundant air flow towards your interior. Without oxygen you can not produce the combustions that make it work. That's the main function of the intake manifold . The air inlet to each of the cylinders of the engine.

The reason why the characteristics of this part affect both the performance of an engine is fluid mechanics . It is enough that there is a calculation error for the engine to malfunction. For example, if one of the ducts causes the air to take longer to reach its corresponding cylinder, the engine will burn the fuel badly . With the consequent appearance of char that comes out in the form of black smoke.

Intake manifold of a motor

For this reason, the intake manifold has a specific design , to allow the cylinders to be filled optimally according to the characteristics of the engine. If you want a greater air passage , you should make them as short and straight as possible. In addition, they are usually symmetrical to ensure that the same amount of air enters each cylinder. And if they can not be, at least each conduit will be manufactured to allow the same flow.

The shape is not the only important feature of the intake manifold. The texture of its interior is also very significant. Normally, in competition or high-performance cars they have the polished interior to a microscopic level so that the air flows faster. In cars that do not have direct injection , and therefore mix the air and fuel inside the collector, the surface is rough . With this they get to generate a turbulence that contributes to a better pulverization of the fuel.

Recirculation of gases

The intake manifold not only carries air to the combustion chambers. It is also associated with the EGR valve in diesel and some gasoline. This valve releases part of the gases that have not been burned correctly in the collector. This way, they return to the cylinder to burn definitively and thus eliminate polluting emissions.

Collectors of a engine

It is also normal to find engines with a recirculation system of gases that generates hot oil .Therefore, just as she has several together whose optimal state is essential for there to be no leaks. If part of the air pressure were lost through an opening, the engine would malfunction, giving signals like a rare color in the exhaust smoke.

It's weirder, but the leak can also be found in the collector itself. This can happen in an accident in which the impact has reached the engine or by a small crack or microperforation in the case of plastic collectors. A problem whose detection can be very complicated if the leak is not in sight. In any case, wherever the leak is found, it can be detected by sharpening the ear to notice the typical whistle it generates or wetting it with soap and water to see where it is generated a small pump.

Exhaust Manifold

 Exhaust manifold of an engine

Once the air has been taken to the engine and the fuel has been burned, touch extract the gases that have been generated . The exhaust manifold is responsible for evacuating these burnt gases inside the cylinder and take them to the catalyst and the rest of the exhaust system.

Like the intake manifolds, the exhaust manifolds are coupled to the engine head by means of nuts and studs. Its design should allow to perfectly synchronize the smoke output of each of the cylinders. If this were not the case, the gases with different outlet pressure would interfere with each other as they converge in the same tube. The slower (or with less pressure) would slow down in its own conduit, returning to the engine and affecting its operation considerably. There are a variety of exhaust manifolds on the market, which can improve engine power or comfort of use. They are normally used in deep engine modifications.

If you want to know more about automotive mechanics and how to maintain or repair the car yourself Same, do not miss the articles:

  • Classification of injection systems
  • Oil and antifreeze mixture
  • How to check an air filter
  • How to clean the car's engine: what can and can not be done

Images - JAK SIE MASZ, Bill Abbott

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