4.11.5 Engine operating modes and carburetor requirements
In this section, we will consider various modes of operation of the carburetor, depending on the operating conditions of the engine. We will also provide the requirements for the functions of the carburetor and see how the structurally simplest carburetor should be transformed in order to fulfill all the tasks assigned to it.
The following main operating conditions of the engine are distinguished:
- start (speaks for itself);
- idle run (a mode in which it is necessary to maintain idle speed, this is stated in a note);
Note
Idle RPM is the minimum RPM at which the engine can run stably without load. You have started the engine without any movement or impact on the accelerator pedal.
- medium loads (driving on an unloaded highway/road without much acceleration - evenly);
- full load (starting the movement of the car, drag racing and everything of this kind);
- fast transition from medium load to full load (mainly when overtaking).
Depending on the mode, it is necessary not only to supply a different amount of the air-fuel mixture to the engine cylinders, but also to use a different ratio of components to obtain it.
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