The Lycoming IO-233 is a non-certified four-cylinder, air-cooled, horizontally opposed piston aircraft engine that produces between and . The IO-233 is a development of the Lycoming O-235, which is itself a derivative of the older

Lycoming O-233 The Lycoming O-233 is a four-cylinder, air-cooled, horizontally opposed piston aircraft engine that was built by Lycoming Engines Lycoming Engines is a major American manufacturer of aircraft engines. With a factory in Williamsport, Pennsyl ...

engine.

Development

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 A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri ...

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. When announced in July 2008 Lycoming expected the engine to be available later that year, once

ASTM ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, an ...

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 The Falcon LS is a two-seat, low wing, light sport aircraft originally produced by Corvus Aircraft in Hungary as the Corvus Phantom and imported into the US by T&T Aviation between 2008–2010 and by Renegade Light Sport 2010–present.Bayerl, Rob ...

was the first airplane to fly with Lycoming's new IO-233-LSA engine on 6 Oct 2010. Renegade Light Sport is working with Lycoming to produce an

aerobatic Aerobatics is the practice of flying maneuvers involving aircraft attitudes that are not used in conventional passenger-carrying flights. The term is a portmanteau of "aerial" and "acrobatics". Aerobatics are performed in aeroplanes and glid ...

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.

Variants

;IO-233-LSA :Initial version, at 2400 rpm to at 2800 rpm

Applications

Aeris Naviter AN-2 Enara The Aeris Naviter AN-2 Enara (Basque for 'Swallow') is a Spanish helicopter that was under development by Aeris Naviter of San Sebastián. The AN-2 was first shown at the 2009 Paris Air Show at Paris–Le Bourget Airport. The aircraft was inte ...

* Dakota Cub Super 18 * Denney Kitfox *

Foxcon Terrier 200 The Foxcon Terrier 200 is an Australian light-sport aircraft, designed and produced by Foxcon Aviation of Mackay, Queensland. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.Bayerl, Robby; M ...

Renegade Falcon LS The Falcon LS is a two-seat, low wing, light sport aircraft originally produced by Corvus Aircraft in Hungary as the Corvus Phantom and imported into the US by T&T Aviation between 2008–2010 and by Renegade Light Sport 2010–present.Bayerl, R ...

Tecnam P92 The Tecnam P92 Echo and Tecnam P92 Eaglet are Italian high-winged, light aircraft, designed by Luigi Pascale and built by Tecnam of Naples. Design and development The P92 design dates to 1960, but versions comply with the Fédération Aéronau ...

* World Aircraft Spirit

Specifications (IO-233-LSA)

References

External links

Textron Lycoming
- Manufacturer's home page
Spec sheet showing images of IO-233
{{US military piston aeroengines 2000s aircraft piston engines Boxer engines IO-233