Fuel vaporizing and mixing device for gasoline engines

Claim 1

A carburetor attachment for insertion between a carburetor and a cooperable engine intake manifold, comprising a sleeve-like tubular member, formed from relatively thin formable sheet material of tubular configuration, adapted to be inserted in the intake bore of such a manifold, said tubular member having at its inlet end a radially outwardly extending annular flange, of greater diameter than that of such an intake bore for supporting the same therein with such flange disposed between the cooperable mating faces of the carburetor and intake manifold, said tubular member having an external diameter at such end slightly less than that of such a bore, the side walls of said tubular member having a plurality of inwardly directed protuberances forming alternate lands and grooves in the internal surface of said tubular member, the inlet ends of the lands being rounded and merging into the sidewalls of said tubular member adjacent the inlet end thereof, the bottom edges of said grooves being arranged for close disposition to the sidewalls of such an intake bore whereby the effective area at the discharge end is only slightly smaller than that of the intake end, as compared with the total area of such an intake bore, said lands being uniformly spaced and having their respective inlet ends circumferentially offset with respect to their associated outlet ends, forming generally spirally arranged lands with the internal surface of the intermediate portion of said sleeve having a relatively smoothly curved serpentine configuration in transverse cross section, whereby each land is of a generally triangular configuration in transverse cross section, having inwardly converging sidewall portions connected by a convex rounded portion.