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.

Civil models

 * O-290
 * Base model engine certified 27 July 1942. 125 hp at 2450 rpm, 6.25:1 compression ratio, dry weight 244 lb


 * O-290-A
 * Certified 27 July 1942. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 251 lb with SR4L-8 or N-8 magnetos, 245 lb with N-20 or N-21 magnetos.


 * O-290-AP
 * Certified 21 July 1944. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 251 lb with SR4L-8 or N-8 magnetos, 245 lb with N-20 or N-21 magnetos.


 * O-290-B
 * Certified 22 January 1943. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 247 lb.


 * O-290-C
 * Certified 22 January 1943. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 238 lb.


 * O-290-CP
 * Certified 21 July 1944. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 238 lb.


 * O-290-D
 * Certified 13 December 1949. 125 hp at 2600 rpm continuous, 130 hp at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 230 lb.


 * O-290-D2
 * Certified 1 May 1952. 135 hp at 2600 rpm continuous, 140 hp at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 233 lb.


 * O-290-D2A
 * Certified 20 April 1953. 135 hp at 2600 rpm continuous, 140 hp at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 236 lb.


 * O-290-D2B
 * Certified 30 September 1954. 135 hp at 2600 rpm continuous, 140 hp at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 236 lb.


 * O-290-D2C
 * Certified 8 May 1961. 135 hp at 2600 rpm continuous, 140 hp at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 235 lb.


 * O-290-G
 * Non-certified, single ignition model intended for use driving a generator in a ground power unit, 125 hp. 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

• Firestone XR-9

• Flying K Sky Raider

• Grumman Kitten

• Isaacs Fury Mk II

• Mustang Aeronautics Midget Mustang

• Pazmany PL-1

• Pazmany PL-2

• Piper PA-12

• Piper PA-18 Super Cub

• Piper PA-20 Pacer

• Piper PA-22 TriPacer

• Rogers Sportaire

• Sea Teziutlán

• Seibel S-4

• Smyth Sidewinder

• Stolp Starduster

• Stout Skycar

• Thorp T-18

• Toyo T-T.10

• VanGrunsven RV-1

• Van Lith VI

• Van's Aircraft RV-3

• Warner Revolution II

• Warner Sportster

• Williams-Cangie WC-1 Sundancer