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Lycoming O-340
The Lycoming O-340 is a family of four-cylinder horizontally opposed, carburetor-equipped aircraft engines, that was manufactured by Lycoming Engines in the mid-1950s.
==Design and development==
The O-340 was designed by Lycoming specifically for the TEMCO-Riley D-16A Twin Navion project. Jack Riley, the designer of that aircraft was interested in an upgraded version of the Lycoming O-320 that would produce more power to give the Twin Navion a better single-engine service ceiling. The Lycoming O-360 was still years away in development and so a modification of the O-320 was undertaken by Lycoming. The O-320 received cylinder longer barrels and a crankshaft with longer stroke to increase displacement and different piston connecting rods. This increased the compression to 8.5:1 and boosted power output to over the O-320's . The engine was later used in a number of airplanes and helicopters and also in amateur-built aircraft designs.
The O-340 family of engines covers a range from to . All have a displacement of 340.4 cubic inches (5.58 litres) and the cylinders have air-cooled heads.〔
The O-340 series was certified under Type Certificate E-277 and first approved on 20 July 1954. The engines are approved for both tractor and pusher applications.〔
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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