4.11.4.e Carburetor operation
Now let’s describe the principle of operation of the carburetor. When the engine crankshaft rotates during the intake strokes occurring in its cylinders, air passes through the carburetor mixing chamber. Inside the diffuser, the air flow rate increases significantly, and a vacuum is obtained near the end of the diffuser. In this case, the fuel from the disperser enters the mixing chamber in streams that are sprayed onto the smallest particles by the air passing at high speed. The fuel mixes with air, evaporates in it, and the resulting air-fuel mixture enters the engine cylinders through the intake manifold. The float chamber with the help of a float and a needle valve continuously maintains a normal fuel level inside the disperser (do not forget that we are describing a simple carburetor, in which there are no additional devices, such as an economizer, an econostat or an accelerating pump).
While driving, the driver essentially sets the carburetor throttle blade to various positions. More or less amount of the combustible mixture enters the engine cylinders. As a result of this the required engine power and vehicle speed are obtained.
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