Different Internal Combustion engines work by the use of different fuel intake systems. In this article, we shall discuss the basic components of an intake system and their respective functions irrespective of the the type of intake system that it functions with.
The primary components of the automotive intake system are:
- intake manifold,
- throttle body/carburetor, and
- air induction components such as air cleaner and ducting.
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| Intake manifold |
Intake Manifold
The intake manifold is attached to the cylinder head. Its construction and design depends on its application. It is normally made of an aluminum alloy.On carburetor engines, the intake manifold supports or houses the carburetor. While on EFI engines it can house or support a throttle body.
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| Carburetor |
Throttle body/Carburetor
The intake manifold can accommodate a carburetor or a Throttle Body Injection unit as illustrated. In either case the mixing of the air/fuel mixture is done at the manifold base.The butterfly shaft connected to the throttle cable controls the airflow through the unit.In multi-point EFI systems, a throttle body is attached to the intake manifold. While the butterfly shaft is attached the throttle cable, it also has a Throttle Position Sensor (TPS) attached to it as well.
The TPS signals the ECU of the throttle opening position so it can complete its fuel requirement calculations.
Air Induction Component
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| Air cleaner |
The air induction system draws in ambient air from the environment. The inlet opening may be located in various positions under the hood.
- Air cleaner
Another function of the air cleaner is to muffle the resonation (that is, dampen the noise) of the swirling incoming air.The location of the air cleaner is dependent on the available space and the hood design
- Ducting
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