Continental O-520

The Continental O-520 is a six-cylinder, horizontally opposed aircraft engine produced by Teledyne Continental Motors. First run in 1963 as a development of the IO-346, it has been produced in versions incorporating fuel injection (IO-520), turbo-charging (TSIO-520), and gearing (GTSIO-520).

Design and development
The IO-520 series engines normally produce 285 to 310 hp and are used in numerous aircraft such as certain models of the Bellanca Viking 300 and Super Viking, the Beech Bonanza and Baron, and Cessna 185- 206-, 210-, 310-, and 400-series aircraft. The IO-520 remained in production in 2019.

The turbocharged GTSIO-520's most common applications are the twin-engine Cessna 404 and 421, where it is rated at 375 hp. The 'G' prefix indicated the incorporation of propeller reduction gearing.

IO-520

 * IO-520-A: 285 hp (213 kW) (Meyers 200)
 * IO-520-B: 285 hp (213 kW) (Beech 35-C33A Debonair, s35, model 36 Bonanza)
 * IO-520-BA: 285 hp (213 kW)
 * IO-520-BB: 285 hp (213 kW)
 * IO-520-C: 285 hp (213 kW)
 * IO-520-CB: 285 hp (213 kW)
 * IO-520-D: 300 hp (224 kW)
 * IO-520-E: 300 hp (224 kW)
 * IO-520-F: 300 hp (224 kW)
 * IO-520-J: 285 hp (213 kW)
 * IO-520-K: 300 hp (224 kW) (Bellanca Viking)
 * IO-520-L: 300 hp (224 kW)
 * IO-520-M: 285 hp (213 kW)
 * IO-520-MB: 285 hp (213 kW)
 * IO-520-N: 300 hp (224 kW)
 * IO-520-NB: 300 hp (224 kW)
 * L/IO-520-P: 250 hp

TSIO-520

 * TSIO-520-A: 255 hp
 * TSIO-520-AE: 250 hp
 * LTSIO-520-AE: 250 hp
 * TSIO-520-AF: 310 hp
 * TSIO-520-B: 285 hp (213 kW)
 * TSIO-520-BB: 285 hp (213 kW)
 * TSIO-520-BE: 310 hp
 * TSIO-520-C: 265 hp
 * TSIO-520-CE: 325 hp
 * TSIO-520-D: 285 hp (213 kW)
 * TSIO-520-DB: 285 hp (213 kW)
 * TSIO-520-E: 300 hp
 * TSIO-520-EB: 300 hp
 * TSIO-520-G: 285 hp (213 kW)
 * TSIO-520-H: 265 hp
 * TSIO-520-J: 310 hp (230 kW)
 * TSIO-520-JB: 310 hp (230 kW)
 * TSIO-520-K: 285 hp (213 kW)
 * TSIO-520-KB: 285 hp (213 kW)
 * TSIO-520-L: 310 hp (230 kW)
 * TSIO-520-LB: 310 hp (230 kW)
 * TSIO-520-M: 285 hp (213 kW)
 * TSIO-520-N: 310 hp (230 kW)
 * TSIO-520-NB: 310 hp (230 kW)
 * TSIO-520-P: 310 hp (230 kW)
 * TSIO-520-R: 310 hp (230 kW)
 * TSIO-520-T: 310 hp (230 kW)
 * TSIO-520-U: 300 hp
 * TSIO-520-UB: 300 hp
 * TSIO-520-VB: 325 hp
 * TSIO-520-WB: 325 hp

GTSIO-520

 * GTSIO-520-C: 340 hp
 * GTSIO-520-D: 375 hp (280 kW) (Cessna 421)
 * GTSIO-520-F: 435 hp
 * GTSIO-520-H: 375 hp (280 kW) (Cessna 421B)
 * GTSIO-520-K: 435 hp
 * GTSIO-520-L: 375 hp (280 kW) (Cessna 421C)
 * GTSIO-520-M: 375 hp (280 kW) (Cessna 404)
 * GTSIO-520-N: 375 hp (280 kW) (Cessna 421C)
 * GTSIO-520-S: 375 hp (280 kW) (Tecnam P2012 Traveller)

Applications
• Aero Commander 685

• Beechcraft Bonanza

• Beechcraft Baron 58P

• Bellanca Viking (17-30 and 17-30A)

• Cessna 185

• Cessna 188

• Cessna 206

• Cessna 207

• Cessna 210

• Cessna 303

• Cessna 310

• Cessna 335

• Cessna 340

• Cessna 402

• Cessna 404

• Cessna 414

• Cessna 421

• Meyers 200D

• Navion H Rangemaster

• Piper PA-46-310P Malibu

• St-Just Super-Cyclone

• Viper Aircraft Viperfan

• Wise GT-400