McCulloch Engineering Superchargers 1937 T-Shirt

Robert Paxton McCulloch formed McCulloch Engineering in Milwaukee, Wisconsin, the city in which his grandfather made millions as an early pioneer of electric utilities and manufacturer of electric trolleys. McCulloch hired on a number of engineers at the firm, including Francis L. Colburn, who designed a simple, easy-to-install centrifugal supercharger. McCulloch began offering the superchargers as kits for Ford’s flathead V-8 engine, advertising them to truck owners as well as racers and owners of every day street-driven cars. The crankshaft-driven supercharger had a fixed 6:1 ratio and was seated horizontally between the carburetor and intake manifold. McCulloch first offered the kit in 1937 and by 1942, his sales topped $3 million.