Lycoming, Avco Lycoming, Textron Lycoming (US)

Part 1: Introduction and O-145 through O-365

This is the first part of the Lycoming engine compilation. All of the introductory material is contained here, as well as the compilations of the engines with smaller displacement, namely from the O-145 through the O-365. The second part of the Lycoming compilation, namely from the O-390 through the OL-1430 can be reached here.

The Lycoming Manufacturing Company was founded in 1908 in Williamsport, Pennsylvania to build automobile and marine engines. Lycoming engines powered 57 different makes of automobiles in 1924 alone, and then became a subsidiary of the Cord and Auburn automobile firms. The R-680 radial aircraft engine was developed in 1929. By 1932, Lycoming was part of the Aviation Corporation of America (renamed Avco in 1947). Lycoming certified their first HOAE, the O-145, in 1938. Textron, Inc. acquired the Avco Lycoming Williamsport and Stratford (Connecticut) Divisions in 1985. During 1987, their engines became known as Textron Lycoming engines. The aircraft gas turbine business of the Stratford Division of Textron Lycoming was sold to Allied Signal Company in 1994. Allied Signal merged with Honeywell Corp. in 1999. Aircraft piston engines continue to be built by Textron Lycoming in Williamsport. In a ceremony at the EAA Oshkosh Airshow on 7/27/2001, the 300,000th Lycoming HOAE was delivered. Textron Lycoming, in April 2002, was renamed "Lycoming - A Textron Company" to reflect the familiarity and strength of the Lycoming brand name.

Lycoming had licensing arrangements with three European companies for production of Lycoming engines in the 1950s and 1960s. One agreement was with Piaggio of Italy, see W56 to W59-60. Piaggio built Lycoming O-435, GO-435, VO-435, GO-480, and GSO-480 engines under this agreement.

BMW Triebwerkbau of Germany also had an agreement with Lycoming. BMW built Lycoming GO-480-B1A6 engines under license for German-built aircraft. BMW Triebwerkbau received FAA type certificate 7E1 on 2/16/61 for this Lycoming engine.

The final arrangement with Potez of France was quite different. Potez was purchased in 1963 by Avco, then the parent of Lycoming (BGE; J63-64 to J65-66). The new firm, Potez-Avco, continued Potez HOAE production, distributed Lycoming engines, and built some Lycoming models until about 1966. It is not known by the compiler which engines were built, but the Lycoming O-235-C1; O-290-D, -D2; O-320; O-340; O-360; O-435; and O-540 were included in the agreement (J63-64 to J65-66).

The Textron Website is very comprehensive and provides basic information for all engine models in their current inventory. When you reach the site, click on the engine photo (or the block printing "Lycoming"). Next, you click on "Product Sales" and then on "Piston Engine Selection Guide" where you can select engine families to find the specific model(s) for which information is desired. All models listed on the Website are indicated below as being in current production. The Lycoming Website also lists aircraft applications (both US and foreign) for most engine models. This information can be found from "Product Sales" by clicking "Certificated Piston Aircraft Engines & Installation Guide (SSP-401)".

Various engine overhaul and replacement-parts manufacturers began, in about 2000, to offer newly manufactured engine kits and assembled engines which followed the basic design of the parallel-valve versions of the Lycoming O-360 and IO-360, initially, and other Lycoming engine models later. These engines are not certificated and can be used only for homebuilt and other experimental aircraft. Some of the firms producing these engines claim to have made detailed improvements over the corresponding Lycoming type-certificated engines. These engines are built from approved parts manufactured by firms other than Lycoming. Firms offering these engines without TCs are: Aero Sport Power of Canada, Aircraft Engine Specialists, America's Aircraft Engines (Eagle IV-EX), Ameritech Industries (Eagle XTREEM), Engine Components (ECI, Titan), Penn Yan Aero, Superior Air Parts, and Teledyne Mattituck.

Lycoming announced at Oshkosh 2005, in turn (KP9/05), that they would provide kits for assembly of non-certificated Lycoming engines to selected, approved shops for build-up and marketing to builders and owners of homebuilt and other experimental aircraft. These kits would be complete and contain only approved Lycoming parts for selected O-320, O-360, O-390, and O-540 series engines. There is an exception for those parts of the O-390 series that do not have type certificate approval. Participating firms are Aero Sport Power of Canada, Barrett Precision Engines, G&N Aviation, Teledyne Mattituck, Penn Yan Aero, Kendra Air Parts of Visalia, California, and Triad Aviation of Burlington, North Carolina.

Lycoming further announced at Sun 'n Fun 2006 (KP7/06, SA6/06) the establishment of their Thunderbird Engines program, which provides custom, factory-built engines to individual experimental aircraft users' requirements. This enables the factory to compete with the engine repair shops in the custom-built engine market.

Some Technical Observations:

(1) Fuel injection in the intake manifold at each cylinder of many Lycoming engines has been offered as an option since 1960 and is denoted by the IO prefix.

(2) Lycoming offered geared versions of many of their engine designs beginning in 1939 with the GO-145 versions of their initial HOAE design, and always denoted them by the GO suffix. The gear ratio is the (propeller rpm divided by the engine crankshaft rpm) and is presented where known.

(3) As the follow-on to their initial O-145 design, Lycoming made the decision to develop engines of nominally 100 hp (O-235), 125 hp (O-290), 150 hp (O-350), and 175 hp (O-435). The O-235 and O-350 were 4- and 6-cylinder engines, respectively, with the same bore and stroke, while the O-290 and O-435 were also 4- and 6-cylinder engines, respectively, with the same bore and stroke. Only the bore was different by 0.5 inches between the two pairs. All four of these engines were introduced between 1940 and 1942 and had a long production and development life except the O-350, which appears to have been unsuccessful. Harold Morehouse was involved in the design of this series and continued active participation in the design and development of Lycoming engines until his retirement at the end of 1965.

(4) Lycoming has built two different engines with the Lycoming O-580 designation, one with 8 cylinders from 1948 and the other with 6 cylinders from 1998. The compiler has chosen to refer to them as the O-580(8) and the O-580(6), respectively. Please note that these designations are for convenience here only, and do not reflect Lycoming's official designation system. Since the 8-cylinder engine has been out of production since about 1961, there is no confusion in contemporary usage.

(5) All families of Lycoming horizontally-opposed aircraft engines are listed in the table of Lycoming Engine Families. This table gives a compact reference to their chronological and technical development.

O-145 -- {3.625 / 3.5 / 144.5} / {92.1 / 88.9 / 2368}

4cyl; O-145-A, (later -A1); 50hp@2300rpm; 1938-1940; Wt = 147-150#; TC = 199 on 6/13/38 - expired 11/2/50.
Single-ignition version.
Ae39; S; W41toW45.
Applications: (US) Aeronca 50-L, 50-TL Chiefs; Piper J-3L50 Cub; Porterfield LP-50 Collegiate; Ross RS-1; Taylorcraft BL.

4cyl; O-145-A2; 55hp@2300rpm; 1938-1945; Wt = 157-163#; TC = 199 on 11/3/38 - expired 11/2/50.
Dual-ignition version.
Ae39toAe43; AY40,41; J41toJ45-46; U&C; W41toW45.
Applications: (UK) Phoenix (formerly Luton) P.A.4a Minor, P.A.5a Major. (US) Aeronca 50-LA Chief; McRae Super Dart homebuilt; Piper J-3L55 Cub, J-4F Cub Coupe; Porterfield LP-55 Collegiate; Taylorcraft BL-55.

4cyl; O-145-B; 65hp@2550rpm; 1939-1950; Wt = 166-169#; TC = 210 on 5/24/39 - expired 11/2/50.
Single- and dual-ignition versions available initially; only dual-ignition versions available after 8/1/41.
Ae39toAe43; AY40,41; Fahey USAAF; J41toJ52-53; W41toW47.
Applications: (France) Jodel D.9 Bébé. (UK) Britten-Norman BN-1F; Phoenix (formerly Luton) P.A.5a Major; Taylor J.T.1 Monoplane; Taylorcraft Aeroplanes Plus C. (US) Aeronca 65-LA, -LB Chiefs, 65-TL, -TAL Tandems; Luscombe 8-B Silvaire; Mooney M18LA Mite; Northrop N-1M "Jeep"; Piper J-3L65 Cub, J-4F Cub Coupe, J-5B Cub Cruiser, PA-15 Vagabond; Porterfield LP-65 Collegiate; Ross RL-2L; Stinson 10-B Voyager; Taylorcraft BL-65, BL-12-65, DL-65; Thorp T-11 Sky Skooter.

4cyl; O-145-C; 75hp@3100rpm; 1939-1946; Wt = 166-169#; TC = 210 on 4/8/39 - expired 11/2/50.
Single- and dual-ignition versions available initially; only dual-ignition versions available after 8/1/41.
Ae39toAe43; AY40,41; J41toJ45-46; W41toW46.
Applications: None found.

4cyl; GO-145-C; 75hp@3200rpm; 1939-1945; Wt = 193-195#; TC = 210 in c.1939 - expired 11/2/50.
Geared to 0.630 (17:27); Single- and dual-ignition versions available; only dual-ignition versions available after 8/1/41.
Ae41toAe43; AY40,41; J41toJ45-46; W41toW45.
Applications: (US) Funk B-75-L; General GI-80 Skyfarer; Piper J-5B Cub Cruiser; Rich-Twin 1-X-2; Stinson 10-B Voyager; Vought-Sikorsky VS-300 (initial versions of Sikorsky's first successful helicopter).

O-160 -- {5.125 / 3.875 / 159.9} / {130.2 / 98.4 / 2620}

Same bore and stroke as O-320, O-480.
Same bore as O-340, O-360, O-540, O-541, O-720.
Same stroke as O-233, O-235, O-290, O-350, O-435, O-580(8).
Proposed engine for experimental light aircraft. Lycoming announced it and displayed a mockup in 1985 at the Paris Air Show and the EAA Fly In at Oshkosh. The engine mockup had a rear-mounted flywheel and prop-flange counterweights for smoother engine operation. Certification was planned, but Lycoming discontinued development in 1986, instead.

2cyl; O-160; 70-80hp@N/Arpm; 1985-1986; Wt = N/A; TC = none.
J85-86toJ86-87; SA10/85, 12/86.
Applications: None.

O-233 -- {4.375 / 3.875 / 233.0} / {111.1 / 98.4 / 3818}

Same bore and stroke as O-235, O-350.
Same stroke as O-160, O-290, O-320, O-435, O-480, O-580(8).
Original designation of O-235, but was soon changed, possibly to be consistent with the USAAC designation system. It is being used again since 2008 for the following US Light Sport Aircraft (LSA) engine, which is a modernized, lighter weight version with throttle-body fuel injection and dual electronic ignition. The new IO-233 was introduced at EAA AirVenture 2008.

4cyl; IO-233-LSA; 100hp@2400rpm-116@2800; 2009-present; Wt = 200-210#; LSA ASTM conformation = ASTM D910 100LL in 2009.
KP11/08, 7/09; SA9/08.
Applications: None found.

O-235 -- {4.375 / 3.875 / 233.0} / {111.1 / 98.4 / 3818}

Same bore and stroke as O-233, O-350.
Same stroke as O-160, O-290, O-320, O-435, O-480, O-580(8).
Originally known as O-233 in early production.

4cyl; O-235; 100hp@2450rpm-125@2800; 1940-present; Wt = 236-255#; TC = 223 on 8/26/40.
Ae41toAe43; AY41,51,52,60; Fahey USAAF; J41to present; S; W41toW70.
Applications: (Argentina) Aero Boero 115, 115BS. (Argentina/US) Aero Boero/Piper PA-38-112 Tomahawk II. (Australia) Aircorp B2N Bushmaster; Dean-Wilson Boomerang [VH-AAV]; Melbourne (MAC) Mamba [VH-JSA]; Victa Airtourer AT.115. (Brazil) Aerotec 122 (T-23) Uirapuru prototype [PP-ZTF]; IPAI-26 Tuca, -30 (production -26); I.P.T.10 Junior; Neiva Paulistinha-56B, Paulistinha L-6 liaison [3099]. (Canada) Crowder Blue Teal Custom amphibian [CF-OYZ]; J.G.H. Hussey Skyhawk 101; Stanley Johnston Special; Western RL-3 Monsoon. (Finland) Heinonen HK-2. (France) AGB/Dabos J.24P; Cagny Performance 2000; Centre Est DR 221 Dauphin, DR 315 Petit Prince; Fournier (later Sportavia) RF-6B-120; Indraéro Fournier (later Sportavia) RF-8 [F-WSOY]; Mudry CAP X; Piel CP-100 Emeraude Sport, C.P.305 Emeraude; Robin DR 400/100 2+2, /120 Petit Prince & /120 Dauphin 80, HR 200/100 Club, /120, /120B, R 2112 Alpha, R 3000/100, R 3100, R 3120; Socata Rallye 110ST (later Galopin) & 125; Van Lith Type VI [F-PINX]. (Germany) Grob G 112, G 115, G 115A; Gyroflug (later FFT) SC 01B Speed Canard pre-production prototype [D-EEEX]; Hoffman H40 Dimona motorglider; Messerschmitt-Bölkow MHK-101.Bl.1 prototype [D-EMHK], MHK-101-V. (Italy) General Avia F.22 Pinguino [I-GEAD]; Partenavia P.66 Oscar-100; SIAI-Marchetti S.202 Bravo/10. (New Zealand) AESL (PAC)/Victa Airtourer AT.115 (T2). (Sweden) FFV BA-14 Starling. (Switzerland) Dätwyler MD-3-115 Swiss Trainer. (UK) Auster D.4/108; Britten-Norman BN-3 Nymph; Slingsby T.56 Currie Wot (0.83-scale S.E.5A movie replica), T.67A & B (license-built Fournier RF6B-120); Trago Mills (later Orca) SAH-1 [ G-SAHI]. (US) American Aviation (later, Grumman American & Gulfstream American) AA-1, -1A, -1B, -1C, Tr-2 Yankee (also T-Cat & Lynx); Beech 77 Skipper; Bellanca Trainer (Aeronca 11 modernized); Call-Air Model A agplane; Cessna 152; Champion (later Bellanca & American Champion) 7ECA, 7GCBC Citabrias; Jamieson J-2-L-1 Jupiter; Monocoupe 90AL-15; Piper J-5C, PA-12 Super Cruisers, PA-14 Family Cruiser, PA-16 Clipper, PA-18-105 (Special) Super Cub, PA-20-115 Pacer, PA-22-108 Colt, PA-38 Tomahawk; Stits SA-3B Playboy; Taylorcraft F21.


Bill Gunston has reported (BGP, p.182) that in the mid-1980s, Lycoming experimented with redesigning engines to operate on 80 octane, unleaded autogas. The O-235 was modified with an increased stroke and with a lower compression ratio that would be compatible with autogas. The resultant O-245 still had the performance of the O-235; see, also, the Lycoming O-365.

O-290 -- {4.875 / 3.875 / 289.3} / {123.8 / 98.4 / 4741}

Same bore and stroke as O-435, O-580(8).
Same stroke as O-160, O-233, O-235, O-320, O-350, O-480.
Specifications and applications of USAAF and USAF versions of the O-290 series up to January 1950 can be found in the AMC reference, a copy of which is available under the "Reference" heading on the Website of the Aircraft Engine Historical Society.

4cyl; O-290; 125hp@2450rpm-135@2600; 1942-1977; Wt = 230-251#; TC = 229 on 7/27/42.
This basic engine was also developed as a Ground Power Unit (GPU) for many military uses. Many of these were sold as government surplus and have been converted for homebuilt light aircraft applications.
Ae41toAe43; AMC; AY41,51,52,60; Fahey USAAF; J41toJ76-77; S; W41toW70.
Applications: (Austria) Oberlerchner JOB-15-135 [OE-VAF]. (Brazil) C.N.N.A. HL-6 Series B Cauré. (Canada) K&S SA 102.5 Cavalier; Zenair Tri-Zenith. (France) Aubert PA-204 Cigale-Major; Jurca M.J.2H Tempête, M.J.5F Sirocco. (Germany) RAAB-Flugzeugbau RAAB-Ambrosini F7 Rondone II. (Italy) Aeromere Falco F.8.L Series I; Aernova A.E.R.1. (Japan) Nihon University N-58 Cygnet (modified Piper Tri-Pacer). (Switzerland) Uetz UM3 Pelikan prototype. (UK) Auster 4, 5, Alpha 5; Chrislea C.H.3 Ace Series 1 [G-AHLG]; Isaacs Fury II (0.7-scale Hawker Fury biplane replica); Miles M.65 Gemini 1A Special; Mitchell-Procter (later Mitchell) Kittiwake II. (US) Aqua Flight I, W-6; Boeing XL-15; Call-Air A-2, -4 agplanes; Champion 7GC Sky-Trac; Colonial C-1 Skimmer; Culver PQ-8A; Glenview GMP-2 Fly-Ride; Grumman G-63 Kitten, G-65 Tadpole, G-72 Kitten II; Helicopter Engineering & Research JOV-3; Hiller XH-44 Hiller-copter; Island Aircraft X-191 Spectra flying boat [N9168]. Piper YL-14, PA-18-125 (L-21A) Super Cub, PA-18-135 (L-21B) Super Cub, PA-20-125 Pacer, PA-20-135 Pacer, PA-22-125 Tri-Pacer, PA-22-135 Tri-Pacer, PA-23 Apache prototype (Twin Stinson); Rawdon T-1; Riley Twin-Navion; Seibel S-4A (YH-24); Spezio Tuholer homebuilt; Stinson Voyager 125 (prototype of 108 series) [NX-31519]; Taylor Aerocar Model 1; Taylorcraft 18 (1950 Army liaison competition); Texas A&M Ag-3; Transcendental 1-G; Warwick W-4 Sport-Biplane Racer [N4777W].

4cyl; XO-290-5; 125hp@3000rpm; 1942-1947; Wt = 303#; TC = none.
Military engine with fan and oil cooling for helicopter applications.
Applications: (US) Firestone (G&A Aircraft) XR-9, -9A, -9B (later XH-9, -9A, -9B), GA-45D.

4cyl; GO-290; 145-160hp@3000rpm; 1942-1947; Wt = N/A; TC = none.
Geared to 0.642.
AJP (for application); AY41; J45-46toJ47; S; W46to47.
Applications: (US) Beech 35 Bonanza (prototype with laminar-flow wing, c/n 3, [NX 80150]).

O-320 -- {5.125 / 3.875 / 319.7} / {130.2 / 98.4 / 5240}

Same bore and stroke as O-160, O-480.
Same bore as O-340, O-360, O-540, O-541, O-720.
Same stroke as O-233, O-235, O-290, O-350, O-435, O-580(8).

Firms in North America offering some non-certificated "O-320" models built from approved parts not manufactured by Lycoming are: America's Aircraft Engines (Eagle IV-EX), Penn Yan Aero, and Superior Air Parts.

Firms in North America offering some non-certficated O-320 models built from approved Lycoming parts are: Aero Sport Power of Canada, Barrett Precision Engines, G&N Aviation, Teledyne Mattituck, Triad Aviation of Burlington, North Carolina and the Lycoming factory under the Thunderbird Engines program.

4cyl; O-320; 140hp@2450rpm-160@2700; 1953-present; Wt = 243-256#; TC = 274 on 7/28/53.
AY60; J53-54to present; S; W53toW70.
Applications: (Argentina) Aero Boero 95B, 115/150, 150, 150 RV, 150 Ag; DINFIA (formerly FMA) I.A.45 Querandi twin; I.A.46 Ranquel. (Australia) Kingsford-Smith Kingsmith (Auster Autocrat J/1 conversion) [VH-AYJ]; Melbourne (MAC) Mamba; VTOL Aircraft (formerly Phillips) Phillicopter helicopter. (Austria) Oberlerchner JOB-15-150; Simmering-Graz-Pauter (SGP) M.222 Flamingo twin. (Brazil) Aerotec A-122-A (military T-23) Uirapuru production [PP-ZTT], A-122-B civil, A-132 Tangará (military YT-17); Neiva IPD-5901 liaison, Paulistinha-56D. (Canada) Zenair Tri-Zenith. (Finland) PIK-15 Hinu sailplane tug. (France) Aubert PA-204 Cigale-Major; Boisavia B.60 Mercurey; Centre Est DR 250, DR 340 Major & DR 360 Chevalier; Chatelain AC-9; Duruble RD-03B & -03C Edelweis; Gardan GY 100 Bagheera [F-WOFO]; Helicop-Air Girhel L51 winged gyroplane; Jurca M.J.5H Sirocco; Morane-Saulnier (later S.E.E.M.S., Socata) M.S. 886 Super Rallye, M.S. 892 Rallye Commodore; Piel CP-100 Emeraude Sport, C.P.323A Emeraude, C.P.605 Super Diamant, C.P.750 Beryl; Robin DR 400/140 Major, /160 Chevalier & Dauphin 80, HR 200/140 & /160, R 2160 Alpha, R 3000/140, R 3140; SRCM-153 Joigny [F-WIRZ]; Socata Rallye 150T Tourisme,150GT, 150ST & 160ST (later Garnemont), TB 9 Tampico; Sud Aviation (later Socata) Gardan GY-80 Horizon 150 & 160; Wassmer WA-50 composite [F-WNZZ], WA-51 Pacific & WA-52 Europe. (Germany) Blume Bl.502; Bölkow/Klemm Kl 107C [D-ECEH]; FFT SC 01B-160 Speed Canard; Grob G 115B, G 115C; Messerschmitt-Bölkow MHK-101-V2, MHK-102; Pützer Elster C; Sportavia Fournier RF6C (later RS 180) Sportsman. (Indonesia) LINPUR LT-200 (Pazmany-based); Nurtanio Model 150 Kindjeng biplane. (Italy) Aeromere Falco F.8.L. Series II & America, Super Falco F.8.L Series IV; Aviamilano P.19R Scricciolo with conventional or tricycle gear; Partenavia P.66 Oscar-150, P.66C-160 Charlie, P.66D Delta (later built by Aviolight); Procair F.15 Picchio; SIAI-Marchetti S.202/15 Bravo. (Japan) Fuji FA-200-160 Aero Subaru; Hamao Siokara Tombo biplane; Itoh (with Nihon University) N-62 Eaglet. (New Zealand) AESL (PAC)/Victa Airtourer AT.150 (T4, T5). (Poland) PZL-110 Koliber 150, 150A, 160A. (South Africa) VOS Springbok helicopter. (Sweden) FFU BA-14 Starling; Malmö Fi10 (later MFI-10) Vipan. (Switzerland) Dätwyler MD-3-160 Swiss Trainer; FFA (with Siai-Marchetti) AS.202/15; Markwalder Marabu; Uetz UM4 Pelikan. (Taiwan/US) AIDC (Pazmany license) PL-1B Chienshou. (UK) Auster D.4/150, D.4/160, D.5/160, D.6/160; Beagle B.121 Beagle Pup-150; Britten Sheriff twin; Britten-Norman BN-3 Nymph; Edgley EA7 Optica prototype; Lockspeiser LDA-01 tandem-wing/canard [G-AVOR]; Nash (based on Procter Kittiwake I) Petrel; Slingsby T.56 Currie Wot (0.83-scale S.E.5A movie replica). (US) American Aviation (later Grumman American & Gulfstream American) AA-5 Traveler, AA-5A Cheetah, GA-7 Cougar; Arctic Tern; Aviat 160 NF, 160 WF Husky Pup (no flaps or with flaps); Beech 23, A23-19, 19A, M19A, B19 Musketeer, Sport 150; Bellanca 7GCBC Scout; Call-Air (later IMCO, Aero Commander) A-4, -5, -5T agplanes; Cessna 172I through 172P (except 172J & 172O) Skyhawks, 177 Cardinal, 303; Champion 7GC Olympia, (also Bellanca & American Champion) 7GCAA Citabria, 7GCB Challenger, (also Bellanca & American Champion) 7GCBC Citabria; Colonial Skimmer; Dempsey TD-2 aerobatic [N6110U]; Lancair 320 Mk II; Maule M-7-160; Monocoupe Meteor I; Mooney M20; Piper PA-18-150 Super Cub, PA-22-150 Tri-Pacer, PA-22-160 Tri-Pacer, PA-23-150 Apache A through E, PA-23-160 Apache F, PA-25-150 Pawnee, PA-28-160 & -150 Cherokee, PA-28-140 Cherokee Cruiser, PA-28-151 Cherokee Warrior, PA-28-161 Warrior II & III; Rawdon T-1, T-1S; Riley Twin-Navion; Robinson R-22 series; Stits-Besler Executive; Stoddard-Hamilton Glasair Super II, Glastar; Taylor Aerocar Model 2; Varga 2150 Kachina. (Yugoslavia) UTVA P418 (prototype UTVA-71) joined-wing.

4cyl; IO-, LIO-320; 150-160hp@2700rpm; 1961-present; Wt = 252-269#; TC = 1E12 on 4/10/61 & 8/28/69.
J63-64to present; S; W66-67toW70.
Applications: (Australia) Melbourne (MAC) Mamba. (Germany) SIAT 223 Flamingo. (Switzerland) Morand (Bü 131 A) Jungmann. (UK) Beagle B.121 Beagle Pup-160. (US) Champion (Bellanca) 7KCAB Citabria, 8KCAB Citabria; Dempsey TD-3 Beta Lightning pod-and-boom twin [N138P]; Lancair Mk II; Piper PA-30 & PA-39 Twin Comanche.

4cyl; AIO-320; 160hp@2700rpm; 1969-1977; Wt = 275-276#; TC = 1E12 on 6/3/69.
Aerobatic engine with fuel system for inverted flight and dry-sump oil system.
J70-71to J76-77; S.
Applications: (Germany) MBB Bö 209-C Monsun.

4cyl; AEIO-320; 150-160hp@2700rpm; 1974-present; Wt = 258-271#; TC = 1E12 on 4/12/74.
Aerobatic engine with fuel system and wet-sump oil system for aerobatic flight.
J74-75to present; S.
Applications: (Germany) Grob G 115D2. (UK) Slingsby T67C, T67M Firefly Mk.II. (US) Bellanca (American Champion) 8KCAB Decathlon; Stolp Starduster II.

O-340 -- {5.125 / 4.125 / 340.4} / {130.2 / 104.8 / 5578}

Same bore as O-160, O-320, O-360, O-480, O-540, O-541, O-720.

4cyl; O-340; 160-170hp@2700rpm; 1954-1977; Wt = 247-250#; TC = 277 on 7/20/54.
AY60; J56-57toJ76-77; S; W56toW62-63.
Applications: (France) Boisavia B.60 Mercurey, B.260 Anjou. (Switzerland) FFA/Bücker Bü-131 R170 Jungmann (engine conversion). (US) Peterson Super V (Beech 35 Conversion to twin); Riley Twin-Navion; Thalman T-4.

4cyl; VO-340; 162hp@N/Arpm; 1954-1965; Wt = N/A; TC = none.
J57-58; S.
Applications: (US) Brantly B-2 (second prototype).

O-350 -- {4.375 / 3.875 / 349.5} / {111.1 / 98.4 / 5727}

Same bore and stroke as O-233, O-235.
Same stroke as O-160, O-290, O-320, O-435, O-480, O-580(8).

6cyl; O-350; 150hp@2500rpm; 1941-1945; Wt = 341-347#; TC=227 in c.1941 - expired 5/11/45.
Ae41toAe42; AY41; J41toJ45-46; S; W41toW44.
Applications: None found.

O-360 -- {5.125 / 4.375 / 361.0} / {130.2 / 111.1 / 5916}

Same bore and stroke as O-540, O-541, O-720.
Same bore as O-160, O-320, O-340, O-480.
Same stroke as O-390, O-580(6), O-780.

Firms in North America offering some non-certificated "O-360" models built from approved parts not manufactured by Lycoming are: Aero Sport Power of Canada, Aircraft Engine Specialists, America's Aircraft Engines (Eagle IV-EX), Ameritech Industries (Eagle XTREEM), Engine Components (ECI, Titan), Penn Yan Aero, Superior Air Parts, and Teledyne Mattituck.

Firms in North America offering some non-certficated O-360 models built from approved Lycoming parts are: Aero Sport Power of Canada, Barrett Precision Engines, G&N Aviation, Teledyne Mattituck, Triad Aviation of Burlington, North Carolina and the Lycoming factory under the Thunderbird Engines program.

4cyl; O-, LO-360; 168-180hp@2700rpm; 1955-present; Wt = 256-303#; TC = 286 on 7/20/55.

*** Note: Although this Website does not list STC data generally, there is an O-360 STC that is of general interest. Teledyne Continental Motors has obtained STC = SE02291AT, dated 7/26/01, for converting Lycoming O-360 models built under TC = 286 from carburetion to fuel injection plus the addition of a Teledyne Aerosance FADEC system for total engine control. TCM calls this modified engine the IOF-360; new TMX IOF-360 engines for non-certificated experimental aircraft can be obtained from Teledyne Mattituck. ***

AY60; J56-57to present; KMM ; S; W56toW70.
Applications: (Argentina) Aero Boero 180, 180 RV, 180 RVR, 180 Ag & 180 SP biplane version; DINFIA (formerly FMA) I.A.45B Querandi twin, I.A.66 Super Ranquel; I.A.51 Tehueiche; Turbay T-3A twin. (Australia) Dean-Wilson Boomerang; Kingsford-Smith Bushmaster (Auster Autocrat J/5G Cirrus Autocar conversion) [VH-KCD]; Southern Cross SC; Victa R-2; VTOL Aircraft (formerly Phillips) Phillicopter helicopter. (Brazil) IPAI-27 Jipe Voador; Neiva IPD-5901 liaison, Regente 360C (C-42, L-42, U-42). (Canada) Avian Model 2/180B Gyroplane [CF-LKF-X]; Zenair Zénith CH 400. (Canada/US) Fleet/Bay Aviation Super V (STC twin-engine conversion of Beech 35 Bonanza). (Finland) Valmet PIK-23 Towmaster. (France) Aubert PA-204 Cigale-Major; Centre Est DR 250, DR 253 Régent; S.A. Normande Jodel D.140 & D.140C, D, E Mousquetaire series, D.140R Abeille [F-WLKK]; Robin DR 400/180 Régent & /180R Remorqueur glider tug, HR 100 prototype [F-WPXO], R 1180 Aiglon, R 3000/160, R 3160L & 3160GT; Socata Rallye M.S.893 Commodore 180, Agricorallye, 180GT (later Gaillard) & 180T (later Galérien), TB 10 Tobago; Wassmer W.A. 40 & 40A Super IV, Sansy, Directeur, Commandant de Bord, President, WA-41 Baladou, WA-54 Atlantiq. (Germany) Blume Bl.503; Bölkow/Klemm Kl 107D, 207; Dornier Do 28 twin prototype; FLUWAG Bremen ESS-641 sailplane tug; Grob G 115C2; SIAT 222. (India) MMPL-I Kanpur-I. (Italy) Aviamilano F.14 Nibbio; Partenavia P.57 Fachiro II, II-f & III, P.64 Oscar-B, Oscar-180; Procair (later General Avia) F.15A & B Picchio; SIAI-Marchetti S.205-18/F, -18/R. (Japan) Fuji 200-180 AO Aero Subaru. (Mexico) Cuauhtemoc M-1 (license-built Maule M-4). (South Africa) AFIC RSA 200 (license-built Partenavia P.64B Oscar B); Rautenbach-Reed aerobatic biplane. (Spain) Aerotechnica AC-12 helicopter. (Sweden) Malmö MFI-10B Vipan; SAAB 91D Safir. (Switzerland) Transair/Piper PA-18-180 Super Cub (STC). (UK) Auster D.4/180, D.5/180 Husky, J-1U Workmaster; Beagle A.109 Airedale, B.121 Pup-180; BGA Supermunk (re-engined deH Chipmunk); Nash (formerly Procter) Petrel [G-AXSF]; Norman (NAC) NAC-1 Freelance [G-NACI]. (US) American Aviation AA-2 Patriot, (later Grumman American, Gulfstream American, American General & Tiger Aircraft) AA-5B, AG-5B Tiger; Aviat (formerly Christen) A-1, A-1A, A-1B 180, A-1B MD 200 Husky; Baumann B-360; Beech B23, C23 Musketeer, Sundance 180, 76 Duchess, 95, B95 Travel Air; Bellanca (American Champion) 8GCBC Scout, Scout CS; Call-Air (later IMCO, Aero Commander) A-6 agplane; Cessna 172Q Cutlass, 172 RG Cutlass RG, 177A & 177B Cardinals; Cub Crafters CC18-180 (re-designed Piper Super Cub); Great Lakes 2T-1A-2; Groen H2X Hawk III gyroplane; Jovair J-2 gyroplane; Lancair 360 Mk. II; Maule M-4, M-5-180, M-7-180; Mooney M20A to M20D, M20G Statesman; Piper PA-24-180 Comanche, PA-28-180 Cherokee, PA- 28-180 Archer, PA-28-181 Archer II & III, PA-44-180 Seminole; Robinson R-22 Beta & Mariner; Saturn (Monocoupe) Meteor II; New Glasair (formerly Stoddard-Hamilton) Glasair Super II.

4cyl; VO-360; 180hp@2900rpm; 1959-1965; Wt = 269-270#; TC = 1E1 on 1/29/59.
AY60; J59-60toJ65-66; S; W59-60toW62-63.
Applications: (US) Brantly B-2A.

4cyl; IO-, LIO-360; 160hp@2400rpm-200@2700; 1960-present; Wt = 261-324#; TC = 1E10 on 9/30/60.
J60-61to present; S; W62-63toW70.
Applications: (Austria) Simmering-Graz-Pauter (SGP) SGP-222 Flamingo twin. (Canada) Avian 2/200 Gyroplane. (Finland) Valmet Leko-70. (France) Matra (later Socata) Moynet M 360 Jupiter push-pull twin; Mudry CAP 10 & 10B; Socata ST 10 Provence, ST 10 Diplomate, TB 200. (Germany) Flugzeug-Union-Süd (FUS, an MBB subsidiary, SIAT design) Flamingo-Trainer A1; Grob G 116; Leicht-Flugtechnik-Union LFU-205; SIAT 223 Flamingo. (Italy) Partenavia P.64B Oscar-200, P.68, P.68B & P.68C Victor twin, P.68 Observer; Procair (later General Avia) F.15F Delfino; SIAI-Marchetti S.205-20/F, -20/R. (Japan) Fuji FA-200-180 Aero Subaru. (South Africa) AFIC RSA 200 (license-built Partenavia P.64B Oscar B). (Spain) CASA (MBB license) 223 Flamingo. (Pakistan) PAC Mushshaq (license-built SAAB Supporter). (South Korea) K A Chang-Chong 91. (Sweden) Andreasson BA-11 biplane; SAAB Safari, Supporter. (Switzerland) Dätwyler Bücker/Dubs R180; FFA (with SIAI-Marchetti) AS.202/18A. (UK) Edgley EA7 Optica; Scottish Aviation (formerly Beagle B.125) SA3-120 Bulldog Series 120, SA3-200 Bulldog Series 200. (US) Aviat/Pitts S-1S, S-2, S-2A Special; Beech A23-24, A24, A24R, B24R, C24R Sierra 200, 95, B95, B95A, D95A & E95 Travel Air; Cessna 172R Skyhawk, 172S Skyhawk SP, 177 RG Cardinal RG; Derringer New Derringer T, GT; Lake Buccaneer; Lancair 360 Mk. II; Maule M-5; Micco (formerly Meyers) MAC-145A; Mooney M20E Chaparral, M20F Executive, M20J Allegro; Piper PA-28R-180 Arrow, PA-28R-200 Arrow II, PA-28R-201 Arrow III, PA-28RT-201 Arrow IV, PA-34-200 Seneca I; Rockwell Commander 111 [N111NR], 112, 112A, 112B. (Yugoslovia) UTVA-75-A21, -A41.

4cyl; IMO-360; 225hp@3400rpm; 1959-1975; Wt = 274#; TC = none.
This was a single-ignition version for unmanned military aircraft.
AY60; J59-60toJ74-75; W62-63.
Applications: (US) Aerojet General MQM-58A (originally Rheem SD-2) multipurpose drone; Radioplane RP-77 drone.

4cyl; IVO-360; 180hp@2900rpm; 1963-1982; Wt = 272#; TC = 1E1 on 5/17/63.
J64-65toJ81-82; S; W62-63toW66-67.
Applications: (US) Brantly B-2B; Schutzow Model B (Bee).

4cyl; HIO-, LHIO-360; 180hp@2700rpm-205@2900; 1963-present; Wt = 261-293#; TC = 1E10 on 7/25/63 & 12/26/74.
J64-65to present; W66-67toW70.
Applications: (Argentina) Cicaré CH-III Colibri helicopter. (US) Enstrom F28 280; Hughes (Schweizer) 200, 300.

4cyl; HO-360; 180hp@2700,2900rpm; 1967-1978; Wt = 257-288#; TC = 286 on 10/2/67.
J63-64toJ77-78; S; W66-67toW70.
Applications: (US) Brantly B-2 (HO-3); Hughes (Schweizer 300C) 269.

4cyl; AIO-360; 200hp@2700rpm; 1967-1976; Wt = 300-301#; TC = 1E10 on 11/20/67.
Aerobatic engine with fuel system for inverted flight and dry-sump oil system.
J67-68toJ75-76; S.
Applications: (France) C.A.A.R.P./Mudry CAP 20A, B; Mudry CAP 20LS-200. (Germany) Flugzeug-Union-Süd (FUS, an MBB subsidiary, SIAT design) Flamingo-Trainer K1 aerobatic; Mylius MY 102 aerobatic. (US) Spinks Model 11 Akromaster; Stephens Akro.

4cyl; TIO-360; 200-210hp@2575rpm; 1967-present; Wt = 348-364#; TC = 16EA on 11/20/67.
J67-68to present; S; W70.
Applications: (Italy) Partenavia P.66D Delta (later built by Aviolight), P68.C-TC twin; SIAI-Marchetti S.210 rectractable-gear twin. (UK) Edgley EA7 Optica. (US) Lancair 360 Turbo; Rutan 202 Boomerang.

4cyl; TO-, LTO-360; 180-210hp@2575rpm; 1974-present; Wt = 315-343#; TC = 26EA on 1/9/74.
J74-75to present; S.
Applications: (France) Robin R 3180GT fixed gear & GTR retractable. (Germany) Flugzeug-Union-Süd (FUS, an MBB subsidiary, SIAT design) Flamingo-Trainer T1 turbocharged. (Italy) Partenavia P.68C-TC Victor twin. (US) Maule M-5-210TC; Piper PA-44-180T Turbo Seminole; Rockwell Commander 112TC, 112TCA.

4cyl; AEIO-360; 180-200hp@2700rpm; 1974-present; Wt = 270-307#; TC = 1E10 on 4/8/74.
Aerobatic engine with fuel system and wet-sump oil system for aerobatic flight.
J75-76to present; S.
Applications: (Czechoslovakia) Zlin Z 242L. (Finland) Valmet L-70 Miltrainer (Vinka). (France) C.A.A.R.P./Mudry CAP 20L-180, -200; Mudry CAP 21. (Germany) Extra 230; Grob G 115D, G 115EG. (Switzerland) ALS Ultimate EA-320 [D-EHLA]; FWA AS 202 Bravo. (UK) British Aerospace (formerly Scottish Aviation, Beagle) SA3-120 Bulldog Series 100, 120, 200; Slingsby T67M 200 Firefly. (US) American Champion 8KCAB Super Decathlon; Christen (later Aviat) Eagle II; Great Lakes 2T-1A-2; Pitts (later Aviat) S-1T, S-2A Special; .


Bill Gunston has reported (BGP, p.182) that in the mid-1980s, Lycoming experimented with redesigning engines to operate on 80 octane, unleaded autogas. The O-320 was modified with an increased stroke and with a lower compression ratio that would be compatible with autogas. The resultant O-365 still had the performance of the O-320; see, also, the Lycoming O-245.

Lycoming: Part 2 (from O-390)


Updated 7/21/09