Four-stroke engine

The four-stroke engine involves the piston making four strokes—intake, compression, power, and exhaust—which improved the efficiency of internal combustion engines. This invention had a significant impact on the development of automobiles and various machinery.
 Nikolaus August Otto Germany 1876 Four-stroke engine

The four-stroke engine involves the piston making four strokes—intake, compression, power, and exhaust—which improved the efficiency of internal combustion engines. This invention had a significant impact on the development of automobiles and various machinery.