What is the role of the intake manifold in the engine?

In every engine, the intake system is extremely important because it deals with engine power, including power and torque. It is important for the smooth running of the engine cylinder that the combustion chambers generate the same pressure. You can achieve this by sending the same level of charge to the cylinders. In addition, the physical characteristics, quality and ratio of charge air and fuel must be the same. Read on to find out more.


The purpose of the carburetor is to supply a mixture of air and fuel to the combustion chamber. The intake manifold sends an equal amount of air / fuel mixture to each cylinder. The timing of the valves must also be correct.

Each piston must compress the charge based on the compression ratio. If the ignition timing is correct, it will ensure that the spark takes place in time. In fact, since the intake manifold has different temperatures, flow rates, contours, angles and passage sizes, the charge may not be the same for all cylinders. You may experience a difference in engine power at low speeds.


Usually the suction pipe contains an aluminum or cast iron pipe. Toda manifolds can be chrome-plated or powder-coated. The carburettor is also mounted in the middle of the intake manifold. It is designed so that the mixture of air and fuel can go into the engine cylinders without any problems. The carburettor is mounted on the intake manifold, which is mounted on the block by design.

Today’s intake manifolds help vaporize gasoline from a mixture of air and fuel. The engine cooling system and exhaust gases are also responsible for providing heat. In addition, thermostatic valves regulate the amount of heat.

System layout

Single tube:

The single-pass intake manifold contains a single tube that creates a connection between the engine cylinders and the carburetor. But the double flange pipe contains a pair of separate pipes for the cylinders. Therefore, if you have a four-cylinder engine, there will be four passages that connect into one pipe that goes to the carburetor.

Duel Pipe:

Double intake manifolds usually have two tubes and two carburetors, and each tube supplies 50% of what the engine needs. The aim is to prevent the stroke in the pipe from overlapping. This can help to improve the even distribution of the air / fuel mixture.


Some modern vehicle engines also feature a four-tube design. If there is a suction line with a four-pipe design, the first and second outlets go to the cylinders in a certain order, which is 2, 3, 5 and 8. On the other hand, the other pipes go to the cylinders in the order 1, 4, 6 and 7.

In short, this was a brief introduction to the role of the intake manifold in a vehicle’s engine. If you want to know more, you can do your homework and understand the whole engine system much better.

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