The Lycoming IO-580 engine is a horizontally opposed, six-cylinder aircraft engine featuring three cylinders per side, manufactured by Lycoming Engines.
There is no carburetted version of the engine, which would have been designated O-580 and therefore the base model is the IO-580.
This engine family competes with the Continental IO-550 series which are also six-cylinder engines with similar power output and weight.
First run in 1996, the IO-580 family of engines covers a range from 300 to 315 hp (224 to 235 kW). The engine has a fuel injection system which meters fuel in proportion to the induction airflow through air-bled nozzles at the individual cylinder intake ports. The engine has a displacement of 583 cubic inches (9.56 litres) and produces a maximum of 315 hp (235 kW) in its B1A version. The cylinders have air-cooled heads cast from aluminum-alloy with a fully machined combustion chamber.
The first IO-580 was type certified on 12 August 1997 on the regulatory basis of FAR 33 effective February 1, 1965 as amended to 33-1 through 33-18. The engine is certified for use in either tractor or pusher configuration installations.
Six-cylinder, horizontally opposed, air-cooled direct drive, 583 cubic inches (9.56 litres), 300 hp (224 kW) at 2500 rpm, dry weight 444 lb (201 kg), PAC-RSA-10ED1 fuel-injection system, certified 12 August 1997
Six-cylinder, horizontally opposed, air-cooled direct drive, 583 cubic inches (9.56 litres), 315 hp (235 kW) at 2700 rpm, dry weight 434 lb (197 kg), PAC-RSA-10ED1 fuel-injection system, certified 23 March 2001
Six-cylinder, horizontally opposed, air-cooled direct drive, 583 cubic inches (9.56 litres), 315 hp (235 kW) at 2500 rpm, dry weight 446 lb (202 kg), certified 13 August 2007. This model has an aerobatic fuel and oil system. It may be equipped with either the PAC-RSA-10ED1 fuel-injection system or a Lycoming FM-250 system.
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Type: 6-cylinder fuel-injected horizontally opposed aircraft engine
Bore: 5.319 in (135 mm)
Stroke: 4.375 (111 mm)
Displacement: 583 c.in (9.56 litres)
Length: 39.34 in (999 mm)
Width: 34.25 in (870 mm)
Height: 21.04 in (534 mm)
Dry weight: 444 lb (201 kg) dry
Fuel system: PAC-RSA-10ED1 fuel-injection
Fuel type: 100LL avgas
Cooling system: air-cooled
Power output: 300 hp (223 kW) at 2500 rpm
Specific power: 0.51 hp/cu.in (24.7 kW/L)
Compression ratio: 8.90:1
Power-to-weight ratio: 0.68 hp/lb (1.11 kW/kg)