Lycoming O-290

{{Infobox aircraft begin

|name= O-290

|image= File:Motore aeronautico - Museo scienza tecnologia Milano D0978.jpg

|caption=

}}{{Infobox Aircraft Engine

|type= Piston aircraft engine

|manufacturer= Lycoming Engines

|national origin=United States

|first run= 1939

|produced=1942–1975 out of production

|major applications=Taylorcraft Auster IV
Taylorcraft Auster V
Ground Power Unit

|number built =

|developed from =

|variants with their own articles =

|developed into = Lycoming O-435

}}

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. {{convert|125|hp|kW|0|abbr=on}} at 2450 rpm, 6.25:1 compression ratio, dry weight {{convert|244|lb|kg|0|abbr=on}}{{cite web|url = http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/6da1a9f45289fbd48525670e0050b3d8/$FILE/E-229.pdf|title = Type Certificate Data Sheet NO. E-229 |access-date = 7 September 2010|last = Federal Aviation Administration|author-link = Federal Aviation Administration|date=June 1963}}

;O-290-A

:Certified 27 July 1942. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|251|lb|kg|0|abbr=on}} with SR4L-8 or N-8 magnetos, {{convert|245|lb|kg|0|abbr=on}} with N-20 or N-21 magnetos.

;O-290-AP

:Certified 21 July 1944. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|251|lb|kg|0|abbr=on}} with SR4L-8 or N-8 magnetos, {{convert|245|lb|kg|0|abbr=on}} with N-20 or N-21 magnetos.

;O-290-B

:Certified 22 January 1943. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|247|lb|kg|0|abbr=on}}.

;O-290-C

:Certified 22 January 1943. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|238|lb|kg|0|abbr=on}}.

;O-290-CP

:Certified 21 July 1944. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|238|lb|kg|0|abbr=on}}.

;O-290-D

:Certified 13 December 1949. {{convert|125|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|130|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 6.5:1 compression ratio, dry weight {{convert|230|lb|kg|0|abbr=on}}.

;O-290-D2

:Certified 1 May 1952. {{convert|135|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|140|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight {{convert|233|lb|kg|0|abbr=on}}.

;O-290-D2A

:Certified 20 April 1953. {{convert|135|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|140|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 7.5:1 compression ratio, dry weight {{convert|236|lb|kg|0|abbr=on}}.

;O-290-D2B

:Certified 30 September 1954. {{convert|135|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|140|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight {{convert|236|lb|kg|0|abbr=on}}.

;O-290-D2C

:Certified 8 May 1961. {{convert|135|hp|kW|0|abbr=on}} at 2600 rpm continuous, {{convert|140|hp|kW|0|abbr=on}} at 2800 rpm for 5 minutes, 7.0:1 compression ratio, dry weight {{convert|235|lb|kg|0|abbr=on}}.

;O-290-G

:Non-certified, single ignition model intended for use driving a generator in a ground power unit, {{convert|125|hp|kW|0|abbr=on}}. Has been widely used in homebuilt aircraft, including the prototype Van's Aircraft RV-3.{{cite web|url = http://www.airventuremuseum.org/collection/aircraft/1VanGrunsven%20RV-3%20Specifications.asp|title = Van Grunsven RV-3 Prototype – Specifications|access-date = 7 September 2010|last = EAA AirVenture Museum|year = 2010}}

=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

{{columns-list|colwidth=20em|

}}

Specifications (O-290-D2A)

{{pistonspecs

|

|ref=Operator's Manual, Textron Lycoming Aircraft Engines.Operator's Manual, Textron Lycoming Aircraft Engines, Series O-235 & O-290 60297-9, 4th Edition January 1988, Pages 2-2 & 2-4, Textron Lycoming.

|type=4-cylinder air-cooled horizontally opposed piston aircraft engine

|bore={{convert|4.875|in|mm|abbr=on}}

|stroke={{convert|3.875|in|mm|abbr=on}}

|displacement={{convert|289|cuin|L|abbr=on}}

|length=

|diameter=

|width=

|height=

|weight={{convert|264|lbs|kg|1|abbr=on}}

|valvetrain=Pushrod-actuated valves

|supercharger=

|turbocharger=

|fuelsystem=Carburetor

|fueltype=

|oilsystem=

|coolingsystem=Air-cooled

|power={{convert|140|hp|kW|0|abbr=on}} at 2,800 rpm

|specpower=0.48 hp/in³ (22.2 kW/L)

|compression=7.5:1

|fuelcon=

|specfuelcon=

|oilcon=

|power/weight=

}}

References

{{cite book |last= Gunston |first= Bill |title=World Encyclopedia of Aero Engines |year=1986 |publisher=Patrick Stephens |location= Wellingborough }}

O-290

Category:Boxer engines

Category:1930s aircraft piston engines