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 longer cylinder barrels and a crankshaft with a longer stroke to increase displacement and different piston connecting rods. This increased the compression to 8.5:1 and boosted power output to 170 hp (127 kW) over the O-320's 150 hp (112 kW). The engine was later used in a number of airplanes and helicopters and also in amateur-built aircraft designs.[1]
The O-340 family of engines covers a range from 160 hp (119 kW) to 170 hp (127 kW). All have a displacement of 340.4 cubic inches (5.58 litres) and the cylinders have air-cooled heads.[2]
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.[2]
Variants
O-340-A1A
Four-cylinder, horizontally opposed, 340.4 cubic inches (5.58 litres), 170 hp (127 kW) at 2700, dry weight 250 lb (113 kg), Marvel-Schebler MA-4-5 carburetor, Scintilla S4LN-20 and S4LN-21 magneto. Minimum fuel grade 91/96 avgas. Certified on 13 January 1955.[2]
O-340-A2A
Four-cylinder, horizontally opposed, 340.4 cubic inches (5.58 litres), 170 hp (127 kW) at 2700, dry weight 250 lb (113 kg), Marvel-Schebler MA-4-5 carburetor, Scintilla S4LN-20 and S4LN-21 magneto. Minimum fuel grade 91/96 avgas. Identical to the A1A but with no provision for a hydraulic propeller control. Certified on 16 November 1956.[2]
O-340-B1A
Four-cylinder, horizontally opposed, 340.4 cubic inches (5.58 litres), 160 hp (119 kW) at 2700, dry weight 247 lb (112 kg), Marvel-Schebler MA-4-5 carburetor, Scintilla S4LN-20 and S4LN-21 magneto. Minimum fuel grade 80/87 avgas. Identical to the A1A except with a reduced 7.15:1 compression ratio and 160 hp to run on 80/87 fuel. Certified on 20 July 1954. The O-340-B1A was originally certified as just the "O-340", but the designation was changed to "O-340-B1A" on 27 September 1956.[2]
lycoming, family, four, cylinder, horizontally, opposed, carburetor, equipped, aircraft, engines, that, manufactured, lycoming, engines, 1950s, 340type, piston, aero, enginenational, origin, united, statesmanufacturer, lycoming, enginesfirst, 1953major, applic. 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 2 O 340Type Piston aero engineNational origin United StatesManufacturer Lycoming EnginesFirst run 1953Major applications Temco D 16 1 Brantly B 2 1 Produced 1954 1957 out of productionDeveloped from Lycoming O 320 Contents 1 Design and development 2 Variants 3 Applications 4 Specifications O 340 A1A 4 1 General characteristics 4 2 Components 4 3 Performance 5 See also 6 ReferencesDesign and development EditThe 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 longer cylinder barrels and a crankshaft with a longer stroke to increase displacement and different piston connecting rods This increased the compression to 8 5 1 and boosted power output to 170 hp 127 kW over the O 320 s 150 hp 112 kW The engine was later used in a number of airplanes and helicopters and also in amateur built aircraft designs 1 The O 340 family of engines covers a range from 160 hp 119 kW to 170 hp 127 kW All have a displacement of 340 4 cubic inches 5 58 litres and the cylinders have air cooled heads 2 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 2 Variants EditO 340 A1A Four cylinder horizontally opposed 340 4 cubic inches 5 58 litres 170 hp 127 kW at 2700 dry weight 250 lb 113 kg Marvel Schebler MA 4 5 carburetor Scintilla S4LN 20 and S4LN 21 magneto Minimum fuel grade 91 96 avgas Certified on 13 January 1955 2 O 340 A2A Four cylinder horizontally opposed 340 4 cubic inches 5 58 litres 170 hp 127 kW at 2700 dry weight 250 lb 113 kg Marvel Schebler MA 4 5 carburetor Scintilla S4LN 20 and S4LN 21 magneto Minimum fuel grade 91 96 avgas Identical to the A1A but with no provision for a hydraulic propeller control Certified on 16 November 1956 2 O 340 B1A Four cylinder horizontally opposed 340 4 cubic inches 5 58 litres 160 hp 119 kW at 2700 dry weight 247 lb 112 kg Marvel Schebler MA 4 5 carburetor Scintilla S4LN 20 and S4LN 21 magneto Minimum fuel grade 80 87 avgas Identical to the A1A except with a reduced 7 15 1 compression ratio and 160 hp to run on 80 87 fuel Certified on 20 July 1954 The O 340 B1A was originally certified as just the O 340 but the designation was changed to O 340 B1A on 27 September 1956 2 Applications EditBrantly B 2 and B 2A helicopter 1 Cessna 170 modified under STC 1 Oakland Super V 1 Piper Apache modified under STC 1 TEMCO Riley D 16A Twin Navion 1 Specifications O 340 A1A EditData from TYPE CERTIFICATE DATA SHEET NO E 277 Revision 5 2 General characteristics Type 4 cylinder horizontally opposed aircraft engine Bore 5 125 in 130 mm Stroke 4 125 105 mm Displacement 340 4 in 5 58 litres Dry weight 250 lb 113 kg dryComponents Fuel type 91 96 avgas minimum Cooling system air cooledPerformance Power output 170 hp 127 kW at 2700 rpm Specific power 0 50 hp in 22 7 kW L Compression ratio 8 5 1 Power to weight ratio 0 68hp lb 1 11 kW kg See also EditRelated lists List of aircraft enginesReferences Edit a b c d e f g h twinnavion com n d An O 340 What s that Retrieved 2009 04 19 a b c d e f g Federal Aviation Administration April 1963 TYPE CERTIFICATE DATA SHEET NO E 277 Revision 5 Retrieved 2009 04 19 Retrieved from https en wikipedia org w index php title Lycoming O 340 amp oldid 896029061, wikipedia, wiki, book, books, library,
