High Quality Content by WIKIPEDIA articles! The Otto engine was a large stationary single-cylinder internal combustion four-stroke engine designed by Nicolaus Otto. It was a low-RPM machine, and only fired occasionally since it was a hit-and-miss engine. Like many engines of the early 1900s, the Otto engine used an open-frame design with all operating cams and levers mounted on the outside of the cylinder head. While this design permits very easy access and observation of all moving components, it also subjects the mechanisms to any dust and moisture in the environment. Consequently this type of machine needs regular cleaning and greasing by an engine operator to keep running correctly, or the levers and gears will eventually seize up from the lack of oiling and dust collecting in the oil to form a sticky and abrasive scum.

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