Continental O-520

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Continental IO-520 2.jpg
Preserved IO-520
Type Piston aircraft engine
Manufacturer Teledyne Continental Motors
First run 1963
Major applications Beechcraft Bonanza
Cessna 210
Developed from Continental IO-346

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[edit]

The IO-520 series of engines normally produced 285-310 HP and were used in numerous aircraft such as certain models of the Bellanca Viking 300 and Super Viking, the Beech Bonanza and Baron, and the Cessna 185, 206, 210, 310, and 400 series of aircraft. It has largely been superseded by Continental's newer IO-550 engine.

The IO-520 series of engine is considered to be a reliable engine, but some of the early versions of this engine had a weaker crankcase than subsequent versions.[citation needed] Versions featuring more substantial crankcases are often referred to as having "heavy crankcases."[citation needed]

The turbocharged GTSIO-520 was not as common and in its most common application (the Cessna 404 and Cessna 421 twin-engine aircraft) it produces 375 horsepower (280 kW). The engine has a reputation of being expensive to maintain and is intolerant of improper operation.[citation needed] When operated properly, most pilots consider the engine to be reliable.[citation needed] Gearing reduces the RPM of the propeller making the engine run quieter than many other engines, although the gearboxes on early versions of this engine were notoriously unreliable.[citation needed] The gearing also adds measurably to the overhauling costs of these engines.


IO-520-A 285 hp (213 kW) (Meyers 200)
IO-520-B 285 hp (213 kW) (35-C33A Debonair, s35, model 36 Bonanza)
IO-520-D 300 hp (224 kW)
IO-520-F 300 hp (224 kW)
IO-520-K 300 hp (224 kW) (Bellanca Viking)
IO-520-L 300 hp (224 kW)
IO-520-M 285 hp (213 kW)
TSIO-520-B 285 hp (213 kW)
TSIO-520-BE 310 hp (230 kW) (Piper PA-46-310P Malibu)
TSIO-520-C 285 hp (213 kW)
TSIO-520-G 300 hp (224 kW)
TSIO-520-J 310 hp (230 kW)
TSIO-520-M 310 hp (230 kW)
TSIO-520-N 310 hp (230 kW)
TSIO-520-R 310 hp (230 kW)
TSIO-520-AF 310 hp (230 kW)
TSIO-520-CE 325 hp (242 kW)
(1964) geared, turbocharged, and injected
GTSIO-520-D 375 hp (280 kW) (Cessna 421)
GTSIO-520-H 375 hp (280 kW) (Cessna 421B)
GTSIO-520-L 375 hp (280 kW) (Cessna 421C)
GTSIO-520-M 375 hp (280 kW)
GTSIO-520-N 375 hp (280 kW) (Cessna 421C)


Specifications (GTSIO-520-D)[edit]

Data from Continental Motors.[1]

General characteristics

  • Type: 6-cylinder horizontally opposed aircraft engine
  • Bore: 5.25 in (133.35 mm)
  • Stroke: 4.00 (101.6 mm)
  • Displacement: 520 in³ (8.51 litres)
  • Length: 63.63 in (161.6 cm)
  • Width: 34.04 in (86.5 cm)
  • Height: 26.63 in (67.6 cm)
  • Dry weight: 484 lb (219.5 kg) without accessories


  • Valvetrain: Overhead valve
  • Fuel system: TCM fuel injection
  • Fuel type: 100/130 Octane Avgas
  • Cooling system: Air-cooled


See also[edit]


  1. ^ Product data sheet GTSIO-520-D Archived 2006-07-17 at the Wayback Machine. Retrieved: 21 November 2012

External links[edit]