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Lycoming O-320-A2A : ウィキペディア英語版
Lycoming O-320

The Lycoming O-320 is a large family of 92 different normally aspirated, air-cooled, four-cylinder, direct-drive engines commonly used on light aircraft such as the Cessna 172 and Piper Cherokee. Different variants are rated for 150 or 160 horsepower (112 or 119 kilowatts). As implied by the engine's name, its cylinders are arranged in horizontally opposed configuration and a displacement of 320 cubic inches (5.24 L).〔Gunston 1989, p.98.〕
==Design and development==
The O-320 family of engines includes the carbureted O-320, the fuel-injected IO-320, the inverted mount, fuel-injected AIO-320 and the aerobatic, fuel-injected AEIO-320 series. The LIO-320 is a "left-handed" version with the crankshaft rotating in the opposite direction for use on twin-engined aircraft to eliminate the critical engine.
The first O-320 (with no suffix) was FAA certified on 28 July 1953 to CAR 13 effective 5 March 1952; this same engine was later re-designated, without change, as the O-320-A1A.〔 The first IO-320 was certified on 10 April 1961, with the AIO-320 following on 23 June 1969 and the first aerobatic AEIO-320 on 12 April 1974. The LIO-320s were both certified on 28 August 1969.〔〔
The O-320 family of engines externally resembles the Lycoming O-235 and O-290 family from which they were derived. The O-320 shares the same stroke as the smaller engines, but produces more power with the bore increased to . The design uses hydraulic tappets and incorporates the provisions for a hydraulically controlled propeller installation as well. The controllable-pitch propeller models use a different crankshaft from those intended for fixed-pitch propellers.〔Christy, Joe: ''Engines for Homebuilt Aircraft & Ultralights'', pages 77-80 TAB Books, 1983. ISBN 0-8306-2347-7〕
The O-320 uses a conventional wet sump system for lubrication. The main bearings, connecting rods, camshaft bearings, tappets and pushrods are all pressure lubricated, while the piston pins, cylinder walls and gears are all lubricated by spray. The oil system is pressurized by an accessory-drive mounted oil pump. A remotely mounted oil cooler is used, connected to the engine by flexible hoses.〔
The -A, -C and -E variants of carbureted O-320, but none of the high compression or fuel-injected versions, have available STCs that allow the use of automotive fuel as a replacement for more expensive avgas. However, in some cases the D series engine, with a fuel-pump modification, is allowed to use minimum 91 octane automotive gas as part of an STC for the Piper aircraft to which it is attached.〔(【引用サイトリンク】Auto Fuel STC for Piper PA28 Aircraft )
The factory retail price of the O-320 varies by model. In 2010 the retail price of an O-320-B1A purchased outright was USD$47,076

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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