# Continental O-520

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O-520 | |
---|---|

Preserved IO-520 | |

Type | Piston aircraft engine |

National origin | United States |

Manufacturer | Teledyne Continental Motors |

First run | 1963 |

Major applications | Beechcraft Bonanza Beechcraft Baron Bellanca Viking Cessna 185 Cessna 206 Cessna 210 |

Produced | 1964-present |

Developed from | Continental IO-346 |

Developed into | Continental IO-550 |

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**).

## Contents

## Design and development[edit]

The IO-520 series engines normally produce 285 to 310 horsepower (213 to 231 kW) 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.^{[1]}

The turbocharged GTSIO-520's most common applications are the twin-engine Cessna 404 and 421, where it is rated at 375 hp (280 kW). Gearing reduces the RPM of the propeller, making the engine run quieter than many other engines.

## Variants[edit]

### IO-520[edit]

- IO-520-A
- 285 hp (213 kW)
^{[2]}(Meyers 200) - IO-520-B
- 285 hp (213 kW)
^{[2]}(Beech 35-C33A Debonair, s35, model 36 Bonanza) - IO-520-BA
- 285 hp (213 kW)
^{[2]} - IO-520-BB
- 285 hp (213 kW)
^{[2]} - IO-520-C
- 285 hp (213 kW)
^{[2]} - IO-520-CB
- 285 hp (213 kW)
^{[2]} - IO-520-D
- 300 hp (224 kW)
^{[2]} - IO-520-E
- 300 hp (224 kW)
^{[2]} - IO-520-F
- 300 hp (224 kW)
^{[2]} - IO-520-J
- 285 hp (213 kW)
^{[2]} - IO-520-K
- 300 hp (224 kW)
^{[2]}(Bellanca Viking) - IO-520-L
- 300 hp (224 kW)
^{[2]} - IO-520-M
- 285 hp (213 kW)
^{[2]} - IO-520-MB
- 285 hp (213 kW)
^{[2]} - IO-520-N
- 300 hp (224 kW)
^{[2]} - IO-520-NB
- 300 hp (224 kW)
^{[2]} - L/IO-520-P
- 250 hp (186 kW)
^{[2]}

### TSIO-520[edit]

- TSIO-520-A
- 255 hp (190 kW)
^{[3]} - TSIO-520-AE
- 250 hp (186 kW)
^{[3]} - LTSIO-520-AE
- 250 hp (186 kW)
^{[3]} - TSIO-520-AF
- 310 hp (231 kW)
^{[3]} - TSIO-520-B
- 285 hp (213 kW)
^{[3]} - TSIO-520-BB
- 285 hp (213 kW)
^{[3]} - TSIO-520-BE
- 310 hp (231 kW)
^{[3]} - TSIO-520-C
- 265 hp (198 kW)
^{[3]} - TSIO-520-CE
- 325 hp (242 kW)
^{[3]} - TSIO-520-D
- 285 hp (213 kW)
^{[3]} - TSIO-520-DB
- 285 hp (213 kW)
^{[3]} - TSIO-520-E
- 300 hp (224 kW)
^{[3]} - TSIO-520-EB
- 300 hp (224 kW)
^{[3]} - TSIO-520-G
- 285 hp (213 kW)
^{[3]} - TSIO-520-H
- 265 hp (198 kW)
^{[3]} - TSIO-520-J
- 310 hp (230 kW)
^{[3]} - TSIO-520-JB
- 310 hp (230 kW)
^{[3]} - TSIO-520-K
- 285 hp (213 kW)
^{[3]} - TSIO-520-KB
- 285 hp (213 kW)
^{[3]} - TSIO-520-L
- 310 hp (230 kW)
^{[3]} - TSIO-520-LB
- 310 hp (230 kW)
^{[3]} - TSIO-520-M
- 285 hp (213 kW)
^{[3]} - TSIO-520-N
- 310 hp (230 kW)
^{[3]} - TSIO-520-NB
- 310 hp (230 kW)
^{[3]} - TSIO-520-P
- 310 hp (230 kW)
^{[3]} - TSIO-520-R
- 310 hp (230 kW)
^{[3]} - TSIO-520-T
- 310 hp (230 kW)
^{[3]} - TSIO-520-U
- 300 hp (224 kW)
^{[3]} - TSIO-520-UB
- 300 hp (224 kW)
^{[3]} - TSIO-520-VB
- 325 hp (242 kW)
^{[3]} - TSIO-520-WB
- 325 hp (242 kW)
^{[3]}

### GTSIO-520[edit]

- GTSIO-520-C
- 340 hp (254 kW)
^{[4]} - GTSIO-520-D
- 375 hp (280 kW)
^{[4]}(Cessna 421) - GTSIO-520-F
- 435 hp (324 kW)
^{[4]} - GTSIO-520-H
- 375 hp (280 kW)
^{[4]}(Cessna 421B) - GTSIO-520-K
- 435 hp (324 kW)
^{[4]} - GTSIO-520-L
- 375 hp (280 kW)
^{[4]}(Cessna 421C) - GTSIO-520-M
- 375 hp (280 kW)
^{[4]} - GTSIO-520-N
- 375 hp (280 kW)
^{[4]}(Cessna 421C)

## Applications[edit]

## Specifications (GTSIO-520-D)[edit]

*Data from* *Continental Motors.*^{[5]}

### 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

### Components

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

### Performance

**Power output:**375 hp (280 kW) (Maximum continuous operation at 3,400 rpm)**Compression ratio:**7.5:1**Power-to-weight ratio:**0.77 hp/lb (1.27kW/kg)

## See also[edit]

## References[edit]

**^**Continental Motors (2019). "500 Series Engines".*continentalmotors.aero*. Retrieved 11 March 2019.- ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}^{k}^{l}^{m}^{n}^{o}^{p}^{q}Federal Aviation Administration (22 March 2019). "Type Certificate Data Sheet No. E5CE". Retrieved 22 March 2019. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}^{k}^{l}^{m}^{n}^{o}^{p}^{q}^{r}^{s}^{t}^{u}^{v}^{w}^{x}^{y}^{z}^{aa}^{ab}^{ac}^{ad}^{ae}Federal Aviation Administration (22 March 2019). "Type Certificate Data Sheet No. E8CE". Retrieved 22 March 2019. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}Federal Aviation Administration (22 March 2019). "Type Certificate Data Sheet No. E7CE". Retrieved 22 March 2019. **^**Product data sheet GTSIO-520-D Archived 2006-07-17 at the Wayback Machine Retrieved: 21 November 2012

## External links[edit]

Media related to Continental O-520 at Wikimedia Commons