Here's why:
* Venturi Effect: The venturi is a constricted section within the carburetor. As air flows through this narrower area, its velocity increases due to the principle of conservation of mass. Think of a river flowing faster as it narrows.
* Pressure Drop: The increase in air velocity at the venturi leads to a decrease in air pressure. This pressure drop is crucial for the carburetor's operation.
* Fuel Atomization: The lower pressure at the venturi draws fuel from the float bowl through a small jet. The high-velocity air stream then atomizes the fuel into fine droplets, creating a combustible mixture.
So, the venturi is the point of maximum air velocity and the heart of the carburetor's fuel-air mixing process.
