Carburetors
The carburetors are all air valve design, utilizing a relatively constant pressure drop to draw fuel into the carburetor from cranking to full load. The advantage of this type of construction is a strong “signal” or vacuum set up by a metering spring holding the air valve closed. A pressure drop under the air valve of approximately six inches of water column is required to open the valve during cranking. The vacuum also is communicated to the converter to allow fuel flow. With the engine stopped, fuel is sealed off within the carburetor as well as in the converter and fuelock, giving a triple seal for safety. The air-fuel metering device, called a mixer, is completely self-contained. It requires no linkage or idle vacuum line to the intake manifold. This construction allows tremendous flexibility in installing the mixer or complete carburetor.