Custom Venturi-Style Intake Trumpet for PHBG Carburetor – Description

This is a custom-made air filter designed specifically for PHBG carburetors. The filter is built in the shape of a trumpet, taking advantage of the Venturi effect to improve airflow and throttle response. Thanks to its smooth internal profile and flared intake mouth, the filter reduces turbulence and helps direct a steady, high-velocity air stream into the carburetor.

The trumpet shape increases the volume of incoming air and stabilizes the flow at higher RPM, improving overall engine breathing. The transition from the wide opening to the narrower section is gradual, creating a low-pressure zone that enhances air suction and boosts acceleration. Compared to standard filters, this design focuses on efficiency, responsiveness, and a more aggressive intake sound.

Lightweight and fully homemade, the filter balances performance and style, giving the carburetor a clean racing look while maximizing airflow dynamics through a simple yet effective Venturi-inspired geometry.