Introduced in 1963, the O-520 is Teledyne Continental Motors' most important engine family. The O-520 is a six-cylinder version of the O-346. Power ratings range from 285 to 435 hp (213 - 325 kW).

models

• IO-520-A: 285 hp (213 kW)
• IO-520-BB: 285 hp (213 kW) with direct injection
• IO-520-D: 300 hp (224 kW) with direct injection
• TSIO-520-NB: 335 hp (250 kW)

specifications

• 6-cylinder, horizontally-opposed, air-cooled piston engine
• Displacement: 520 cubic inches (8.5 litres)
• Bore x stroke: 5.25 x 4.00 inches

used by

• Beech 35 Bonanza
• Bellanca 17-30 Viking
• Cessna 185
• Cessna 210E Centurion
• Cessna 340