Lycoming O-290 Explained

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. 1250NaN0 at 2450 rpm, 6.25:1 compression ratio, dry weight 2440NaN0[1]
    O-290-A
  • Certified 27 July 1942. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2510NaN0 with SR4L-8 or N-8 magnetos, 2450NaN0 with N-20 or N-21 magnetos.[1]
    O-290-AP
  • Certified 21 July 1944. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2510NaN0 with SR4L-8 or N-8 magnetos, 2450NaN0 with N-20 or N-21 magnetos.[1]
    O-290-B
  • Certified 22 January 1943. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2470NaN0.[1]
    O-290-C
  • Certified 22 January 1943. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2380NaN0.[1]
    O-290-CP
  • Certified 21 July 1944. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2380NaN0.[1]
    O-290-D
  • Certified 13 December 1949. 1250NaN0 at 2600 rpm continuous, 1300NaN0 at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight 2300NaN0.[1]
    O-290-D2
  • Certified 1 May 1952. 1350NaN0 at 2600 rpm continuous, 1400NaN0 at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 2330NaN0.[1]
    O-290-D2A
  • Certified 20 April 1953. 1350NaN0 at 2600 rpm continuous, 1400NaN0 at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight 2360NaN0.[1]
    O-290-D2B
  • Certified 30 September 1954. 1350NaN0 at 2600 rpm continuous, 1400NaN0 at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 2360NaN0.[1]
    O-290-D2C
  • Certified 8 May 1961. 1350NaN0 at 2600 rpm continuous, 1400NaN0 at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight 2350NaN0.[1]
    O-290-G
  • Non-certified, single ignition model intended for use driving a generator in a ground power unit, 1250NaN0. Has been widely used in homebuilt aircraft, including the prototype Van's Aircraft RV-3.[2]

    Military models

    O-290-1
  • Identical to the O-290-B[1]
    O-290-3
  • Identical to the O-290-C[1]
    O-290-11
  • Identical to the O-290-D[1]

    References

    Notes and References

    1. Web site: Type Certificate Data Sheet NO. E-229 . 7 September 2010. Federal Aviation Administration. Federal Aviation Administration. June 1963.
    2. Web site: Van Grunsven RV-3 Prototype – Specifications. 7 September 2010. EAA AirVenture Museum. 2010.

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