Which German engineer gives his name to the four-stroke cycle of a petrol engine?
Four-stroke engine Four-stroke engine A four-stroke (also four-cycle) engine is an internal combustion (IC) 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 cylinder, in either direction. The four separate strokes are termed: These four strokes can be remembered by the colloquial phrase, "Suck, Squeeze, Bang, Blow". Nikolaus August Otto as a young man was a traveling salesman for a grocery concern. In his travels, he encountered the internal combustion engine built in Paris by Belgian expatriate Jean Joseph Etienne Lenoir. In 1860, Lenoir successfully created
Petrol-paraffin engine heated by diverted exhaust gas. Petrol-paraffin fuelling is suitable for four-stroke cycle piston engines and wankel engines. A petrol/paraffin engine tends to run hotter whilst burning paraffin, and so the cooling system must be sufficiently robust. Being slower burning, the paraffin requires the longer combustion period that a four-stroke engine can provide; so two-stroke versions are rare J.A.P. used their 16H engine on TVO. Although modern petrol engines may have compression ratios typically between 9:1 and 12:1, a petrol-paraffin engine requires a lower compression ratio of 8:1 or less, to avoid pre-ignition of the fuel-air mixture which would cause damage