Four-stroke engine
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A four-stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylin
An Otto Engine from 1880s US Manufacture
This 2004 Toyota Prius hybrid has an Atkinson-cycle engine as the petrol-electric hybrid engine
Audi Diesel R15 at Le Mans
Crankcase
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A crankcase is the housing in a piston engine that surrounds the crankshaft. In most modern engines, the crankcase is integrated into the engine block.
De Dion-Bouton engine (circa 1905) with a crankcase formed from separate castings of the upper and lower halves
Gardner 0 stationary engine (a plate acts as a safety shield but the crankshaft is not fully enclosed).