Lycoming IO-720

Last updated

IO-720
Type Piston aero-engine
National origin United States
Manufacturer Lycoming Engines
First run1961
Major applications PAC Fletcher
Piper Comanche 400
Helio Courier
Produced1961–present
Developed from Lycoming O-360

The Lycoming IO-720 engine is a large displacement, horizontally opposed, eight-cylinder aircraft engine featuring four cylinders per side, manufactured by Lycoming Engines. [1]

Contents

There is no carbureted version of the engine, which would have been designated O-720 and therefore the base model is the IO-720. The IO-720 is the only flat-eight configuration aircraft engine currently in production. [2]

Design and development

The engine has a fuel injection system which schedules fuel flow proportionally to the airflow, with fuel vaporization occurring at the intake ports. The engine has a displacement of 722 cubic inches (11.8 litres) and produces 400 hp (298 kW). The cylinders have air-cooled heads cast from aluminum alloy with a fully machined combustion chamber. [1] [3]

The first IO-720 was type certified on 25 October 1961 to the CAR 13 standard as amended to 15 June 1956 including 13-1, 13-2, 13-3, 13-4. [2]

In 2009 a new IO-720-A1B cost US$113,621, with a rebuilt engine retailing for US$75,435 and a factory overhaul priced at US$66,289. [4]

Variants

IO-720-A1A
Eight-cylinder, horizontally opposed, air-cooled direct drive, fuel injection, internal oil jet piston cooling, 722 cubic inches (11.8 litres), 400 hp (298 kW), certified 25 October 1961 [2]
IO-720-A1B
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -A1A except equipped with Bendix S8LN-1208 and S8LN-1209 magnetos, certified 22 February 1971 [2] [5]
IO-720-A1BD
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -A1B except has a dual magneto, certified 30 December 1976 [2]
IO-720-B1A
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -A1A except for top exhaust cylinders and offset exhaust valve shroud tubes, certified 4 November 1965 [2]
IO-720-B1B
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -B1A except equipped with Bendix S8LN-1208 and S8LN-1209 magnetos and Bendix RSA-10ED1 fuel injection, certified 22 February 1971 [2] [5]
IO-720-B1BD
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -B1B except has a dual magneto, certified 30 December 1976 [2] [5]
IO-720-C1B
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -A1B except that it has up-exhaust cylinder heads, certified 22 December 1971 [2]
IO-720-C1BD
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -C1B except has a dual magneto, certified 28 January 1977 [2]
IO-720-D1B
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -A1B except has a rear type air inlet housing instead of a front inlet, certified 29 October 1973 [2] [5]
IO-720-D1BD
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -D1B except has a dual magneto, certified 28 January 1977 [2]
IO-720-D1C
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -D1B except equipped with an angled fuel injector adapter, certified 15 April 1982 [2] [5]
IO-720-D1CD
fuel-injected, 722 cubic inches (11.8 litres), 400 hp (298 kW), same as -D1C except has a dual magneto, certified 10 June 1977 [2] [5]

Applications

IO-720-A1A
IO-720-A1B
IO-720-A1BD
IO-720-B1A
IO-720-B1B
IO-720-B1BD
IO-720-D1B
IO-720-D1C
IO-720-D1CD

Specifications (IO-720A)

Data from Lycoming Specialty Datasheet [3] and TYPE CERTIFICATE DATA SHEET NO. 1E15, Revision 6 [2]

General characteristics

Components

Performance

See also

References

  1. 1 2 3 4 5 6 7 Lycoming Engines (n.d.). "Lycoming IO-720" . Retrieved December 19, 2008.{{cite web}}: CS1 maint: year (link)
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Federal Aviation Administration (February 1988). "TYPE CERTIFICATE DATA SHEET NO. 1E15, Revision 6" . Retrieved December 13, 2008.
  3. 1 2 Lycoming Engines (2004). "Specialty datasheet" (PDF). Retrieved December 20, 2008.
  4. ↑ Lycoming Engines (2009). "2009 Lycoming Service Engine Price List" (PDF). Archived from the original (PDF) on June 12, 2009. Retrieved June 21, 2009.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 Lycoming Engines (n.d.). "Engine Finder" . Retrieved December 19, 2008.{{cite web}}: CS1 maint: year (link)
  6. ↑ Demand Media (2008). "The Piper PA-24 Comanche" . Retrieved December 20, 2008.
  7. ↑ Morrison, Steve (August 8, 2008). "Morrison 6 Specifications" . Retrieved October 11, 2012.


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