Carburetor for internal combustion engines

Abstract

Disclosed is a carburetor for internal combustion engines having mechanism substantially to eliminate the effect on the engine of carburetor ice. When ice builds on the downstream face of the butterfly valve, on the side adjacent the idle jet, there is such a reduction of pressure at the mouth of the idle jet as to cause fuel starvation in the main jet, thus causing improper fuel air ratios or engine failure. To overcome this, mechanism is provided to vent the idle jet passage to atmosphere whenever the butterfly valve is in position for the main jet to become the primary source of fuel supply. Further, by venting the idle jet as indicated, the presence of ice on the butterfly valve will not produce the heretofore over-rich or lean mixtures, found to exist. Furthermore, such venting is useful for preventing dieseling in automobile engines.

Dependencies are inferred from the claim text.