Hubert Schillings designed several miniature engines from 1970 to 1980. Configurations vary from 1-cylinder aircraft engines to 2-, 3-, 4-, 6- and 8-cylinder V-type and inline engines for both aircraft and automobiles. Most of his engines are machined from aluminum bar stock (ingot).
This 6-cylinder inline Dual Overhead Cam (DOHC) design has cylinders laid out in a straight line with two camshafts that operate the valves. The engine was built by Rolf Luther in 1998. One camshaft operates the intake valves, and the other camshaft operates the exhaust valves, thus the description “dual overhead cams.”
Typically, Schillings used belts to drive the cams rather than gears, but most unusual about this model is the use of spark ignition. It is believed that Rolf Luther completed only three or four of these inline engines and this is the only example known to have spark ignition.