Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Unit Injector (abbrev. UI) is an integrated direct fuel injection system for diesel engines; combining the injector nozzle and the injection pump in a single component, the pump of which is, usually, driven by a shared camshaft.In 1911 a patent was issued in Great Britain for a unit injector resembling those in use today to Frederick LamploughCommercial usage of unit injectors in the U.S. began in early 1930s on Winton engines powering locomotives, boats, even US Navy submarines, and in 1934, Arthur Fielden was granted U.S. patent No.1,981,913 on the unit injector design later used for the General Motors two-stroke diesel engines. Most mid-sized diesel engines used a single pump and separate injectors, but some makers, such as Detroit Diesel became well-known for favouring unit injectors.

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