Holley Model 1945 1 Barrel Carburetor

Fig 1 - Carburetor:

This single barrel carburetor, Fig. 1, utilizes dual neutrophil floats to control the fuel level, thus permitting high angularity operation during the most severe operating conditions. Also, the float construction eliminates the possibility of a malfunction due to a punctured float.

An electric choke system is incorporated to open the choke at approximately 60 degrees

The accelerator pump is of the piston type and is operated by a rod and a link connected to the throttle lever.

The power enrichment system on all units, consists of a power valve installed near the center of the carburetor body and a vacuum piston located in the bowl cover.

A spring-loaded modulated power valve is used. A vacuum passage in the throttle body transmits manifold vacuum to the vacuum piston chamber in the howl cover. Under light throttle and load conditions, vacuum acting on the vacuum piston is sufficient to overcome the spring tension. When the throttle valve is opened to 55 degrees, vacuum acting on the vacuum piston is bled to the atmosphere and manifold vacuum is closed off. The throttle shaft is provided with a small hole which aligns with a port in the base of the carburetor when the throttle valve is opened to 55 degrees. This vents the vacuum piston chamber to the atmosphere, allowing the spring tension to open the power valve.