When I went to school for engine repair in the 1980s, we studied the differences between two- and four-stroke engine cycles extensively. If you’re not familiar with engine strokes, understanding the basic concepts is simple. A four-stroke internal combustion engine operates on the Otto cycle, a design conceived by German-born Nicolaus August Otto as early as 1861 and eventually awarded patent number 365701. The four strokes of the Otto-cycle engine include intake, compression, ignition (or power), and exhaust and
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