![]() An oil engine will have a compression ratio of about 3:1, where a typical Diesel engine will have a compression ratio ranging between 15:1 to 20:1. ![]() Bolinder is now part of the Volvo group.Īkroyd-Stuart's vaporizing oil engine (compared to spark-ignition) is distinctly different from Rudolf Diesel's better-known engine where ignition is initiated through the heat of compression. Similar engines, for agricultural and marine use, were built by Bolinder in Sweden. It was later developed in the USA by the German emigrants Mietz and Weiss by combining it with the two-stroke engine developed by Joseph Day. The first prototypes were built in 1886 and production started in 1891 by Richard Hornsby & Sons of Grantham, Lincolnshire, England under the title Hornsby Akroyd Patent Oil Engine under license. ![]() It was perfected by Herbert Akroyd Stuart in the end of the 19th century. ![]() It is a surface ignition engine in which the superheated fuel is ignited by being brought into contact with oxygen-rich fresh air, rather than by a separate source of ignition, such as a spark plug. The hotbulb, or hot bulb engine or vaporizing oil engine is a type of internal combustion engine.
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