Opposed-piston engine
Combustion engine using disks compressing fuel in the same cylinder / From Wikipedia, the free encyclopedia
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For horizontally-opposed engines, see flat engine.
An opposed-piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head. Petrol and diesel opposed-piston engines have been used mostly in large-scale applications such as ships, military tanks, and factories. Current manufacturers of opposed-piston engines include Cummins, Achates Power and Fairbanks-Morse Defense (FMDefense).