Lycoming IO-233

File:FK-Lightplanes FK12 Comet with Lycoming IO-233 engine.jpg

The IO-233 was announced by the company at AirVenture on 28 July 2008 as a new engine for light sport aircraft. The engine was conceived as a lightened version of the Lycoming O-235 by company engineers who were building their own kit LSAs and found that there was no powerplant that met their requirements for power output and weight, with the ability to burn either 100LL avgas or unleaded automotive fuel.

The resulting engine weighs less than the O-235 and incorporates a throttle body injector system with a tuned intake manifold and dual electronic ignition, or optionally a carburetor in place of the throttle body injector to save further cost and weight. The engine has a 2400-hour time between overhauls. Additional features include a lightweight 14 volt alternator, an optimized oil sump, a streamlined accessory housing, a lightweight starter and roller tappets.{{cite web|url = http://www.lycoming.textron.com/news-and-events/pdfs/233-engine.pdf|title = The IO-233-LSA|access-date = 2009-04-04|last = Lycoming Engines|author-link = Lycoming Engines|date=July 2008}}{{Cite news|url = http://www.avweb.com/avwebflash/exclusivevids/ExclusiveVideo_EAAAirVenture2011_LycomingO233_AircraftEngine_205060-1.html|title = Video: Lycoming's O-233 Takes Flight|access-date = 27 July 2011|last = Bertorelli|first = Paul|date=July 2011| work = AVweb}}

When announced in July 2008 Lycoming expected the engine to be available later that year, once ASTM testing for LSA use was completed. The company also contemplated certifying the engine in 2009. There is no indication that certification has been completed.

At AirVenture 2011, the company announced that the engine was commencing volume production and was flying in both fuel-injected and carbureted versions.

Renegade Light Sport's Falcon LS was the first airplane to fly with Lycoming's new IO-233-LSA engine on 6 Oct 2010.{{cite web|url = http://renegadelightsport.com/aircraft/falcon/|title = Renegade Falcon LS|access-date = 2011-11-23|url-status = dead|archive-url = https://web.archive.org/web/20111109102119/http://renegadelightsport.com/aircraft/falcon/|archive-date = 2011-11-09}}

Renegade Light Sport is working with Lycoming to produce an aerobatic version of the IO-233-LSA engine to be designated as the AEIO-233. The design goals include fuel injection, an inverted sump and that it be capable of +9/-3 Gs.{{cite web|url = http://www.generalaviationnews.com/2011/11/14/renegade-light-sport-developing-acro-engine-for-lsa/ |title= Renegade Light Sport developing acro engine for LSA |work= General Aviation News |access-date = 2011-11-23}}

;IO-233-LSA

:Initial version, {{convert|100|hp|kW|0|abbr=on}} at 2400 rpm to {{convert|116|hp|kW|0|abbr=on}} at 2800 rpm

• Aeris Naviter AN-2 Enara
• Dakota Cub Super 18
• Denney Kitfox
• Foxcon Terrier 200
• Renegade Falcon LS{{Cite web|url = http://renegadelightsport.com/aircraft/falcon/engine-options/|title = Engine Options|access-date = 21 November 2011|last = Renegade Light Sport|year = 2011|url-status = dead|archive-url = https://web.archive.org/web/20111203234904/http://renegadelightsport.com/aircraft/falcon/engine-options/|archive-date = 3 December 2011}}
• Tecnam P92
• World Aircraft Spirit

{{pistonspecs|

|ref=Lycoming Specification Sheet

|type=direct drive, four-cylinder, aircraft piston engine

|bore={{convert|4.375|in|mm|1|abbr=on}}

|stroke={{convert|3.875|in|mm|1|abbr=on}}

|displacement=233.3 in³ (3.82 L)

|length={{convert|26.968|in|mm|1|abbr=on}}

|diameter=

|width={{convert|31.928|in|mm|1|abbr=on}}

|height={{convert|20.571|in|mm|1|abbr=on}}

|weight={{convert|200|lb|kg|0|abbr=on}} to {{convert|210|lb|kg|0|abbr=on}}

|valvetrain=Pushrod-actuated valves

|supercharger=

|turbocharger=

|fuelsystem=throttle body injector

|fueltype= 100LL avgas or autofuel

|oilsystem=dry sump

|coolingsystem=air-cooled

|power={{convert|100|hp|kW|0|abbr=on}} at 2400 rpm, {{convert|116|hp|kW|0|abbr=on}} at 2800 rpm

|specpower=0.43 hp/in³ (19.6 kW/L)

|compression=8.1:1

|fuelcon= 5.25 USgal/h (19.9 L/h)

|specfuelcon=

|oilcon=

|power/weight={{convert|0.50|hp/lb|kW/kg|abbr=on}}

|designer=

|reduction_gear=

|general_other=

|components_other=

|performance_other=

}}

{{aircontent

|see also=

|related=

|similar aircraft=

|lists=

}}

{{Reflist}}

{{commons category}}

• [http://www.lycoming.textron.com/ Textron Lycoming] - Manufacturer's home page
• [http://www.lycoming.textron.com/news-and-events/pdfs/LSA_Engine.pdf Spec sheet showing images of IO-233]

{{Lycoming aeroengines}}

{{US military piston aeroengines}}

Category:2000s aircraft piston engines

Category:Boxer engines

IO-233