How a Carburetor Works – Venturi

How a carburetor works: the venturi

How a Venturi Works

A venturi is a restriction in the carburetor air horn. Air is forced through the venturi and when it goes through the restriction (B), the air speeds up. This creates a vacuum which will be strongest in the throat of the venturi, but will exist for a short distance after the venturi (C). This is not the vacuum source for things like the vacuum advance, but does play a crucial part in drawing fuel from the carburetor float bowl.
2 Jet Venturi Example
2 Jet Venturi
Edelbrock 4 Barrel Venturis
Edelbrock Venturi

Updated on 04/13/2022

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