Hubert Schillings, of Germany, designed several miniature engines from 1970 to 1980. Configurations vary from 1-cylinder aircraft engines to 2-, 3-, 4-, 6- and 8-cylinder inline and V-type engines for both aircraft and automobiles. Most of his engines were machined from aluminum bar stock (billet), but a few were machined from magnesium.
This 4-cylinder inline single overhead cam (SOHC) has cylinders in a row vertical to the crankshaft. Each cylinder has two valves (one for intake and one for exhaust) and the single camshaft operates both the intake and exhaust valves, “thus the single overhead cam.” Finished in the early 1970s, this engine is 12″-long, 8″-wide, 6″-high, and weighs 5 lbs.
Typically, Schillings used belts to drive the cams rather than gears and operated his engines on methanol and glow ignition. It is not known how many of these 4-cylinder SOHC engines he produced.