 Lycoming O320

O320 A Lycoming O320D2A installed in a Symphony SA160 Type Piston aeroengine Manufacturer Lycoming Engines First run 1953 Major applications Cessna 172
Piper CherokeeThe Lycoming O320 is a large family of 92 different normally aspirated, aircooled, fourcylinder, directdrive engines commonly used on light aircraft such as the Cessna 172 and Piper Cherokee. Different variants are rated for 150 or 160 horsepower (112 or 119 kilowatts). As implied by the engine's name, its cylinders are arranged in horizontally opposed configuration and a displacement of 320 cubic inches (5.24 L / 319.75cuin).^{[1]}
Contents
Design and development
The O320 family of engines includes the carbureted O320, the fuel injected IO320, the inverted mount, fuel injected AIO320 and the aerobatic, fuel injected AEIO320 series. The LIO320 is a series of two models identical to the same model IO320, but with the crankshaft rotating in the opposite direction for use on twinengined aircraft to eliminate the critical engine.^{[2]}^{[3]}
The first O320, the A1A was FAA certified on 28 July 1953 to CAR 13 effective 5 March 1952. The first IO320 was certified on 10 April 1961, with the AIO320 following on 23 June 1969 and the first aerobatic AEIO320 on 12 April 1974. The LIO320s were both certified on 28 August 1969.^{[2]}^{[3]}
The O320 family of engines externally resembles the Lycoming O235 and O290 family from which they were derived. The O320 shares the same 3.875 in (98 mm) stroke as the smaller engines, but produces more power with the bore increased to 5.125 in (130 mm). The design uses hydraulic tappets and incorporates the provisions for a hydraulically controlled propeller installation as well. The controllable pitch propeller models use a different crankshaft from those intended for fixed pitch propellers.^{[4]}
The O320 uses a conventional wet sump system for lubrication. The main bearings, connecting rods, camshaft bearings, tappets and pushrods are all pressure lubricated, while the piston pins, cylinder walls and gears are all lubricated by spray. The oil system is pressurized by an accessorydrive mounted oil pump. The engine uses a remotely mounted oil cooler, connected to the engine by flexible hoses.^{[4]}
The carburetted O320, but not the fuelinjected versions, have available an STC that allows the use of automotive fuel as a replacement for more expensive avgas.^{[5]}
The factory retail price of the O320 varies by model. In 2010 the retail price of an O320B1A purchased outright was USD$47,076^{[6]}
Variants
O320 series
 O320A1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Provisions for a controllable pitch propeller and 25degree spark advance.^{[4]}
 O320A1B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with straight riser in oil sump and 32 carburetor.^{[4]}
 O320A2A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with fixed pitch propeller.^{[4]}
 O320A2B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A2A but with straight riser in oil sump and 32 carburetor.^{[4]}
 O320A2C
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A2B but with retard breaker magnetos.^{[4]}
 O320A2D
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E3D but with conical mounts.^{[4]}
 O320A3A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with 7/16" prop bolts.^{[4]}
 O320A3B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A3A but with straight riser in oil sump and 32 carburetor.^{[4]}
 O320A3C
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A3B but with retard breaker magnetos.^{[4]}
 O320B1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as A1A but with high compression pistons.^{[4]}
 O320B1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with straight riser in oil sump and 32 carburetor.^{[4]}
 O320B2A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with fixed pitch propeller provisions.^{[4]}
 O320B2B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B2A but with straight riser in oil sump and 32 carburetor.^{[4]}
 O320B2C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B2B but with retard breaker magnetos.^{[4]}
 O320B2D
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as D1D but with conical engine mounts and no propeller governor.^{[2]}
 O320B2E
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as B2B except the carburetor is in the same location as the O320D models.^{[2]}
 O320B3A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with 7/16 inch propeller bolts.^{[4]}
 O320B3B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with 7/16 inch propellor bolts, a straight riser in oil sump, and 32 carburetor.^{[4]}
 O320B3C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B3B but with retard breaker magnetos.^{[4]}
 O320C1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B1A.^{[4]}
 O320C1B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B1B.^{[4]}
 O320C2A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B2A.^{[4]}
 O320C2B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B2B.^{[4]}
 O320C2C
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B2C.^{[4]}
 O320C3A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B3A.^{[4]}
 O320C3B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B3B.^{[4]}
 O320C3C
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Low compression version converted through field conversion of B3C.^{[4]}
 O320D1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B3B but with Type 1 dynafocal mounts.^{[4]}
 O320D1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as D1A but with retard breaker magnetos.^{[4]}
 O320D1C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as D2C but with provisions for a controllable propeller,^{[4]}
 O320D1D
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the D1A but with Slick instead of Bendix magnetos and a horizontal carburetor and induction housing.^{[2]} This model was used in the Gulfstream American GA7 Cougar twin.
 O320D1F
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1F except with high compression pistons.^{[4]}
 O320D2A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as D1A but with fixed pitch propeller provisions and 3/8 inch attaching bolts.^{[4]} Used in the Symphony SA160.
 O320D2B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as D2A but retard breaker magnetos.^{[4]}
 O320D2C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as D2A except 1200 series magnetos.^{[4]}
 O320D2F
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2F except with high compression pistons.^{[4]}
 O320D2G
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the D2A except with Slick instead of Bendix magnetos and 7/16 inch instead of 3/8 inch propeller flange bolts..^{[2]}
 O320D2H
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the D2G except with a O320B sump and intake pipes and with provisions for AC type fuel pump.^{[2]}
 O320D2J
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1.Similar to the D2G but with two Slick impulse coupling magnetos and the propeller governor pad, fuel pump and governor pads on the accessory housing all not machined.^{[2]} Used in the Cessna 172P.
 O320D3G
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the D2G but with 3/8 inch propeller attaching bolts.^{[2]}
 O320E1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A3B but with Type 1 dynafocal mounts.^{[4]}
 O320E1B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1A but with retard breaker magnetos.^{[4]}
 O320E1C
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1B.^{[4]}
 O320E1F
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1C but with propeller governor drive on the left front of the crankcase.^{[4]}
 O320E1J
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as the E1F but with Slick magnetos.^{[2]}
 O320E2A
 150 hp (112 kW) at 2700 rpm, or 140 hp (104 kW) at 2450 rpm Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1A but with fixed pitch propeller, 3/8 inch attaching bolts and an alternate power rating of 140 hp (104 kW).^{[4]}
 O320E2B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2A but with retard breaker magnetos.^{[4]}
 O320E2C
 150 hp (112 kW) at 2700 rpm, or 140 hp (104 kW) at 2450 rpm Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2A but 1200 series mags and an alternate power rating of 140 hp (104 kW).^{[4]}
 O320E2D
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Similar to E2A but with Slick disposable magnetos and 0235 front.^{[4]} Used in the Cessna 172 I to M models.
 O320E2F
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1F but with fixed pitch prop provisions.^{[4]}
 O320E2G
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2D but with 0320A sump and intake pipes.^{[4]}
 O320E2H
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2D but with S4LN20 and 21 magnetos.^{[4]}
 O320E3D
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2D but with 3/8 inch propeller flange bolts.^{[4]}
 O320E3H
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E3D but with S4LN20 and 21 magnetos.^{[4]}
 O320H1AD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Integral accessory section crankcase, front mounted fuel pump external mounted oil pump and D4RN2O21 impulse coupling dual magneto.^{[2]}
 O320H1BD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Same as H1AD but with a D4RN2200 retard breaker dual magneto.^{[2]}
 O320H2AD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Same as H1AD but with provisions for a fixed pitch propeller.^{[2]} This was the troublesome engine that was installed on the Cessna 172N.^{[7]}
 O320H2BD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Same as the H2AD but with a D4RN2200 retard breaker dual magneto.^{[2]}
 O320H3AD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Same as the H2AD but with 3/8 inch propeller flange bolts, in place of instead of 7/16 inch.^{[2]}
 O320H3BD
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 100LL avgas, compression ratio 9.00:1. Same as H3AD but with a D4RN2200 retard breaker dual magneto.^{[2]}
IO320 series
 IO320A1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Base model with a Bendix RSA 5AD1 fuel injection system.^{[3]}
 IO320A2A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with provisions for fixed pitch propeller.^{[3]}
 IO320B1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1A but with the fuel injector offset toward the engine's fore and aft centerline.^{[3]}
 IO320B1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1A but with an AN fuel pump drive.^{[3]}
 IO320B1C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the B1A but with an adapter for mounting the fuel injector straight to the rear.^{[3]}
 IO320B1D
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the B1C but with S1200 series high altitude magnetos.^{[3]}
 IO320B1E
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the D1C except with a horizontal fuel injector.^{[3]}
 IO320B2A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the BIA but with provision for a fixed pitch propeller.^{[3]}
 IO320C1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the B1B except it has features making it suitable for adding a turbosupercharger via a Supplemental Type Certificate This engine has internal piston cooling oil nozzles.^{[3]}
 IO320C1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the C1A but with a horizontal rear mounted fuel injector.^{[3]}
 IO320D1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the B1D but with Type 1 dynafocal mounts, S4LN1227 and S4LN1209 magnetos and the fuel injector mounted vertically under the oil sump.^{[3]}
 IO320D1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the D1A but with the propeller governor drive on the left front of crankcase instead of on the accessory housing.^{[3]}
 IO320D1C
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the D1B but with Slick Magnetos.^{[3]}
 IO320E1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2A but with provision for a controllable pitch propeller.^{[3]}
 IO320E1B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E1A but with Slick 4050 and 4051 magnetos.^{[3]}
 IO320E2A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A2A but with Scintilla S4LN20 and S4LN21 magnetos, straight conical mounts, and the fuel injector mounted under the oil sump.^{[3]}
 IO320E2B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E2A but with Slick 4050 and 4051 magnetos.^{[3]}
 IO320F1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the C1A except with a Type 1 (30°) dynafocal mount attachment instead of Type 2 (18°) mount attachment.^{[3]}
LIO320 series
 LIO320B1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as B1A except with counterclockwise engine rotation and reverse rotation of accessories. It uses a modified starter ring gear, crankshaft, cam shaft, accessory housing and oil pump body. This engine is usually paired with an IO320B1A on a twin engined aircraft.^{[3]}
 LIO320C1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as C1A except with the same changes as the LIO320B1A. It has provisions for adding a turbosupercharger. This engine is usually paired with an IO320C1A on a twin engined aircraft.^{[3]}
AIO320 series
 AIO320A1A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the IO320B1D but this model permits installation and operation of the engine in the inverted position. The differences include a front mounted propeller governor, two dry oil sumps, dual external oil scavenge pumps, an oil tank, three options for the position of the fuel injector and a Type 1 dynafocal mount.^{[3]}
 AIO320A1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1A but with one impulse coupling magneto.^{[3]}
 AIO320A2A
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1A but with provision for a fixed pitch propeller.^{[3]}
 AIO320A2B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1A but has one impulse coupling magneto and a fixed pitch propeller.^{[3]}
 AIO320B1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the A1B but with a frontmounted fuel injector.^{[3]}
 AIO320C1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the B1B but with the fuel injector vertically mounted on bottom of the oil sump in the front position.^{[3]}
AEIO320 series
 AEIO320D1B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the IO320D1B but with an inverted oil system kit to allow aerobatic flight.^{[3]}
 AEIO320D2B
 160 hp (119 kW) at 2700 rpm, Minimum fuel grade 91/96 or 100LL avgas, compression ratio 8.50:1. Same as the AEIO320D1A but without provisions for a propeller governor.^{[3]}
 AEIO320E1A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as the IO320E1A but with an inverted oil system kit to allow aerobatic flight.^{[3]}
 AEIO320E1B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as the IO320E1B but with an inverted oil system kit to allow aerobatic flight.^{[3]}
 AEIO320E2A
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as the IO320E2A but with an inverted oil system kit to allow aerobatic flight.^{[3]}
 AEIO320E2B
 150 hp (112 kW) at 2700 rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as the IO320E2B but with an inverted oil system kit to allow aerobatic flight.^{[3]}
Applications

This list is incomplete; you can help by expanding it.
 Aviat Husky A1B160
 Avid Flyer
 Aero Commander 100
 Alpha 160A
 Beechcraft Musketeer
 Bellanca Decathlon
 Canadian Home Rotors Safari
 Cessna 172
 EM11 Orka
 Grumman American AA5
 Gulfstream American GA7 Cougar
 Hatz homebuilt biplane
 Hollmann HA2M gyrocopter
 MBB Bo 209
 Mooney M20
 Mustang Aeronautics Mustang II
 Osprey Osprey 2
 Partenavia P66B Oscar 150
 Piper Aztec
 Piper Apache
 Piper PA40 Arapaho
 Piper Twin Comanche
 Piper Cherokee
 Piper Tripacer
 PZL110 Koliber
 Robin DR400
 Robinson R22
 Rutan LongEZ
 Socata TB9 Tampico
 Symphony SA160
 Thorp T18
 Piper PA18150 Super Cub
 Van's Aircraft RV3
 Van's Aircraft RV4
 Van's Aircraft RV6
 Van's Aircraft RV8
 Van's Aircraft RV9
 Varga Kachina
 Vulcanair P68C
 Wassmer WA 52
Specifications (O320A1A)
Data from TYPE CERTIFICATE DATA SHEET NO. E274 Revision 20^{[2]}
General characteristics
 Type: Fourcylinder aircooled horizontally opposed engine
 Bore: 5.125 in (130 mm)
 Stroke: 3.875 in
 Displacement: 319.8 in³
 Dry weight: 244 lb (111 kg)
Components
 Valvetrain: Two overhead valves per cylinder
 Fuel system: Updraft carburetor
 Fuel type: minimum grade of 80/87 avgas
 Oil system: Wet sump
 Cooling system: Aircooled
Performance
 Power output: 150 hp (112 kW)
 Compression ratio: 7:1
 Powertoweight ratio: 1.63 lb/hp (0.99 kW/kg)
See also
References
Notes
 ^ Gunston 1989, p.98.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} ^{h} ^{i} ^{j} ^{k} ^{l} ^{m} ^{n} ^{o} ^{p} ^{q} Federal Aviation Administration (September 2005). "TYPE CERTIFICATE DATA SHEET NO. E274 Revision 20". http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/B8D9638EAC0BE96786257085006EBBA3?OpenDocument&Highlight=320. Retrieved 20090115.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} ^{h} ^{i} ^{j} ^{k} ^{l} ^{m} ^{n} ^{o} ^{p} ^{q} ^{r} ^{s} ^{t} ^{u} ^{v} ^{w} ^{x} ^{y} ^{z} ^{aa} ^{ab} ^{ac} ^{ad} ^{ae} ^{af} ^{ag} ^{ah} Federal Aviation Administration (December 2003). "TYPE CERTIFICATE DATA SHEET NO. 1E12 Revision 9". http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/BE788C9F926115C286256E4E006974C9?OpenDocument&Highlight=320. Retrieved 20090116.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} ^{h} ^{i} ^{j} ^{k} ^{l} ^{m} ^{n} ^{o} ^{p} ^{q} ^{r} ^{s} ^{t} ^{u} ^{v} ^{w} ^{x} ^{y} ^{z} ^{aa} ^{ab} ^{ac} ^{ad} ^{ae} ^{af} ^{ag} ^{ah} ^{ai} ^{aj} ^{ak} ^{al} ^{am} ^{an} ^{ao} ^{ap} ^{aq} ^{ar} ^{as} ^{at} ^{au} ^{av} Christy, Joe: Engines for Homebuilt Aircraft & Ultralights, pages 7780 TAB Books, 1983. ISBN 0830623477
 ^ Experimental Aircraft Association (2009). "Engine Models Approved". http://www.eaa.org/autofuel/autogas/approved.asp. Retrieved 20090606.
 ^ Lycoming Engines (January 2010). "2010 Lycoming Service Engine Price List" (PDF). http://www.lycoming.textron.com/utility/globalresources/2010AftermarketEnginePriceList.pdf. Retrieved 3 October 2010.
 ^ Cessna Aircraft: Pilot Operating Handbook 1977 Skyhawk Cessna Model 172N, page 13. Cessna Aircraft, 1976.
Bibliography
 Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1852601639
External links
Lycoming aircraft engines Opposed piston engines Radial engines and H engines R680 · R7755 · H2470
Turbofans PLF1 · ALF 502/YF102 · LF 507
Turboprops/Turboshafts AGT1500 · LTS101/LTP101 · T53 · T55
Aeroderivative marine gas turbines TF40
Joint development Avco (Lycoming)/Pratt & Whitney: T800APW (Turboshaft)
See also AlliedSignal Aerospace/Honeywell Aerospace
United States military piston aircraft engine designation system H (fourbank
Hconfiguration inline)I (invertedV inline) L (singlebank inline) O (opposed) O145 · O150 · O170 · O175 · O190 · O200 (C) · O200 (F) · O205 · O233 · O235 · O240 · O280 · O290 · O300 (C) · O300 (F) · O320 · O335 · O340 · O346 · O350 · O360 (C) · O360 (L) · O390 · O425 · O435 · O470 · O480 · O520 · O540 (F) · O540 (L) · O541 · O550 · O580 · O720 · O805 · O1230
R (radial) R265 · R370 · R370 · R420 · R440 · R500 · R540 · R540 · R545 · R550 · R600 · R670 · R680 · R720 · R755 · R760 · R790 · R830 · R915 · R975 · R980 · R985 · R1200 · R1300 · R1340 · R1454 · R1510 · R1535 · R1670 · R1690 · R1820 · R1830 · R1850 · R1860 · R2000 · R2060 · R2160 · R2180 · R2270 · R2600 · R2800 · R3350 · R4090 · R4360 · XR7755
V (uprightV inline) W (threebank
Wconfiguration inline)W2779
See also: X1800 • US military gas turbine aeroengines • Piston engine configurationsLists relating to aviation General Aircraft (manufacturers) · Aircraft engines (manufacturers) · Airlines (defunct) · Airports · Civil authorities · Museums · Registration prefixes · Rotorcraft (manufacturers) · TimelineMilitary Accidents/incidents Records Categories: Boxer engines
 Lycoming aircraft engines
 Aircraft piston engines 19501959
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