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Straight-five engine
The straight-five engine or inline-five engine is an internal combustion engine with five cylinders aligned in one row or plane, sharing a single engine block and crankcase. This configuration is a compromise between the smaller inline-four engine and the larger straight-6.
Henry Ford had an inline-five engine developed in the late 1930s to early 1940s for a compact economy car design, which never saw production due to lack of demand for small cars in the United States.
Lancia of Italy developed a 5-cylinder diesel engine in the late 1930s for use in their RO truck series to replace the earlier 2-cylinder diesel and 3-cylinder petrol engines used. The subsequent model became known as the 3RO and was used by both Italian and German armed forces during WW2. This truck remained in production until 1950.〔Storia Illustrata del Camion Italiano Edizione Neri ISBN 978-88-900 955-8-0〕
A straight-five engine did not see production for passenger cars until Mercedes-Benz introduced the OM617 diesel in 1974. The first production petrol straight-five was the 2.1 R5 introduced by Volkswagen Group in the Audi 100 towards the end of the 1970s, developments of which powered the Audi Quattro rally racer. An (analysis ) of their use shows they were often used by middle-market brands seeking to extend their engine ranges into higher capacities without going for the six-cylinder option. In recent years the engine has been falling out of favour, with Volvo announcing in 2014 it would discontinue building them, for example.〔http://driventowrite.com/2014/08/21/theme-of-the-month-engines-throbby-thrummy-quints/〕
== Characteristics ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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