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This press photo dated Dec. 27, 1931, shows Frank B. Stearns demonstrating a diesel or “crude oil-burning” engine to a group of bankers and engineers in Cleveland, Ohio. Stearns earlier built the well regarded Stearns automobile between 1901 and 1925, the year he sold the company to J. N. Willys. After selling the company, it appears he then went to work on developing and producing this engine.
The unusual engine featured eight cylinders with sixteen pistons and two crankshafts, with one at the top and the other at the bottom of the engine, which were geared together. Many more details and links to more and other photos are on
The Old Motor.