What effect does the carburetor venturi have on air pressure?

The venturi effect is a phenomenon that occurs in a carburetor, which plays a crucial role in the mixing of air and fuel for the combustion process in an engine. As air flows through the venturi, which is a narrowed section of the carburetor, it speeds up due to the reduction in cross-sectional area. According to Bernoulli's principle, as the speed of the moving fluid (in this case, air) increases, the pressure decreases.

Consequently, the carburetor venturi decreases air pressure in that specific area. This drop in pressure creates a vacuum that draws fuel into the airstream from the float bowl, allowing for the formation of a combustible mixture. The reduction in air pressure in the venturi is essential for effective fuel atomization and engine performance.

An understanding of how the venturi operates is critical for solving various scenarios related to engine performance and tuning, as it directly affects the air-fuel mixture that is delivered to the engine cylinders.