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Lycoming O-290

 

The Lycoming O-290 is a dual ignition, four-cylinder, air-cooled, horizontally opposed aircraft engine. It was first run in 1939, and entered production three years later.

A common variant of the type is the O-290-G, a single ignition model which was designed to drive a generator as part of a ground power unit.

 

Variants:

Civil models

O-290
Base model engine certified 27 July 1942. 125 hp (93 kW) at 2450 rpm, 6.25:1 compression ratio, dry weight 244 lb (111 kg)
 
O-290-A
Certified 27 July 1942. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 251 lb (114 kg) with SR4L-8 or N-8 magnetos, 245 lb (111 kg) with N-20 or N-21 magnetos.
 
O-290-AP
Certified 21 July 1944. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 251 lb (114 kg) with SR4L-8 or N-8 magnetos, 245 lb (111 kg) with N-20 or N-21 magnetos.
 
O-290-B
Certified 22 January 1943. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 247 lb (112 kg).
 
O-290-C
Certified 22 January 1943. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 238 lb (108 kg).
 
O-290-CP
Certified 21 July 1944. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 238 lb (108 kg).
 
O-290-D
Certified 13 December 1949. 125 hp (93 kW) at 2600 rpm continuous, 130 hp (97 kW) at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 230 lb (104 kg).
 
O-290-D2
Certified 1 May 1952. 135 hp (101 kW) at 2600 rpm continuous, 140 hp (104 kW) at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 233 lb (106 kg).
 
O-290-D2A
Certified 20 April 1953. 135 hp (101 kW) at 2600 rpm continuous, 140 hp (104 kW) at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 236 lb (107 kg).
 
O-290-D2B
Certified 30 September 1954. 135 hp (101 kW) at 2600 rpm continuous, 140 hp (104 kW) at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 236 lb (107 kg).
 
O-290-D2C
Certified 8 May 1961. 135 hp (101 kW) at 2600 rpm continuous, 140 hp (104 kW) at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 235 lb (107 kg).
 
O-290-G
Non-certified, single ignition model intended for use driving a generator in a ground power unit, 125 hp (93 kW). Has been widely used in homebuilt aircraft, including the prototype Van's Aircraft RV-3.
 
Military models

O-290-1
Identical to the O-290-B

O-290-3
Identical to the O-290-C

O-290-11
Identical to the O-290-D

 

Applications:
Adkisson SJ-1 Head Skinner
Aerocar
Aero Commander 100
Aquaflight Aqua I
Aydlett A-1
Chrislea Super Ace
Falconar F11 Sporty
Flying K Sky Raider
Isaacs Fury Mk 1
Mustang Aeronautics Midget Mustang
Pazmany PL-1
Pazmany PL-2
Piper PA-18 Super Cub
Piper PA-20 Pacer
Piper PA-22 TriPacer
Rogers Sportaire
Seibel S-4
Stolp Starduster
Thorp T-18
Toyo T-T.10
VanGrunsven RV-1
Van Lith VI
Van's Aircraft RV-3
Warner Sportster

 

Specifications:
O-290-D2A
Type: 4-cylinder air-cooled horizontally opposed piston aircraft engine
Bore: 4.875 in (124 mm)
Stroke: 3.875 in (98 mm)
Displacement: 289 cu in (4.74 L)
Dry weight: 264 lbs (119.7 kg)
Valvetrain: Pushrod-actuated valves
Fuel system: Carburetor
Cooling system: Air-cooled
Power output: 140 hp (105 kW) at 2,800 rpm
Specific power: 0.48 hp/cu.in (22.2 kW/L)
Compression ratio: 7.5:1

 

 


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