{{short description|Family of flat-six piston aircraft engines}} {{Refimprove|date=November 2012}} {{infobox aero engine |name=O-520 |image=Continental IO-520 2.jpg |caption=Preserved IO-520 |engine_type=Piston aircraft engine |national_origin=United States |manufacturer= Teledyne Continental Motors |first_run= 1963 |produced= 1964-present |major_applications= {{ubl|Beechcraft Bonanza | Beechcraft Baron|Cessna 206|Cessna 210|Cessna 310|Cessna 340|Cessna 421}} |number_built = |developed_from = Continental IO-346 |variants_with_their_own_articles = |developed_into = Continental IO-550 }}
The '''Continental IO-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 {{convert|285|to|310|hp|-1}} 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.<ref name="official">{{cite web|url = http://continentalmotors.aero/engines/500.aspx|title = 500 Series Engines|access-date = 8 November 2022|author=Continental Aerospace Technologies|author-link=Continental Aerospace Technologies|work = continentalmotors.aero|year=2022|archive-url= https://archive.today/20221108141454/http://www.continental.aero/engines/500.aspx|archive-date= 8 November 2022|url-status= live}}</ref>
The geared GTSIO-520's most common applications are the twin-engine Cessna 404 and 421, where it is rated at {{convert|375|hp|abbr=on}}. The 'G' prefix indicated the incorporation of propeller reduction gearing.
==Variants== ===IO-520=== ;IO-520-A: 285 hp (213 kW)<ref name="E5CE">{{cite web|url = https://drs.faa.gov/browse/excelExternalWindow/3915185C295FDD9686258846004F1E30.0001?modalOpened=true|title = Type Certificate Data Sheet No. E5CE Revision 27|access-date = 8 November 2022|author = Federal Aviation Administration|author-link = Federal Aviation Administration|date = 8 March 2022|archive-url= https://archive.today/20221108141653/https://drs.faa.gov/browse/excelExternalWindow/3915185C295FDD9686258846004F1E30.0001%3FmodalOpened%3Dtrue?modalOpened=true|archive-date= 8 November 2022|url-status= live}}</ref> (Meyers 200) ;IO-520-B: 285 hp (213 kW)<ref name="E5CE"/> (Beech 35-C33A Debonair, s35, model 36 Bonanza) ;IO-520-BA: 285 hp (213 kW)<ref name="E5CE"/> (Beech V35B(-TC), to 1974) ;IO-520-BB: 285 hp (213 kW)<ref name="E5CE"/> (Beech V35B(-TC), from 1975 on) ;IO-520-C: 285 hp (213 kW)<ref name="E5CE"/> ;IO-520-CB: 285 hp (213 kW)<ref name="E5CE"/> ;IO-520-D: 300 hp (224 kW)<ref name="E5CE"/> ;IO-520-E: 300 hp (224 kW)<ref name="E5CE"/> ;IO-520-F: 300 hp (224 kW)<ref name="E5CE"/> ;IO-520-J: 285 hp (213 kW)<ref name="E5CE"/> ;IO-520-K: 300 hp (224 kW)<ref name="E5CE"/> (Bellanca Viking) ;IO-520-L: 300 hp (224 kW)<ref name="E5CE"/> ;IO-520-M: 285 hp (213 kW)<ref name="E5CE"/> ;IO-520-MB: 285 hp (213 kW)<ref name="E5CE"/> ;IO-520-N: 300 hp (224 kW)<ref name="E5CE"/> ;IO-520-NB: 300 hp (224 kW)<ref name="E5CE"/> ;L/IO-520-P: {{convert|250|hp|kW|0|abbr=on}}<ref name="E5CE"/>
===TSIO-520=== ;TSIO-520-A: {{convert|255|hp|kW|0|abbr=on}}<ref name="E8CE">{{cite web|url = https://drs.faa.gov/browse/excelExternalWindow/9E0F2A7C6E49173F86258543004495A0.0001?modalOpened=true|title = Type Certificate Data Sheet No. E8CE Revision 24|access-date = 8 November 2022|author = Federal Aviation Administration|author-link = Federal Aviation Administration|date = 6 April 2020|archive-url= https://archive.today/20221108142216/https://drs.faa.gov/browse/excelExternalWindow/9E0F2A7C6E49173F86258543004495A0.0001%3FmodalOpened%3Dtrue?modalOpened=true|archive-date= 8 November 2022|url-status= live}}</ref> ;TSIO-520-AE: {{convert|250|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;LTSIO-520-AE: {{convert|250|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-AF: {{convert|310|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-B: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-BB: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-BE: {{convert|310|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-C: {{convert|265|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-CE: {{convert|325|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-D: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-DB: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-E: {{convert|300|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-EB: {{convert|300|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-G: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-H: {{convert|265|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-J: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-JB: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-K: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-KB: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-L: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-LB: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-M: 285 hp (213 kW)<ref name="E8CE"/> ;TSIO-520-N: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-NB: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-P: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-R: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-T: 310 hp (230 kW)<ref name="E8CE"/> ;TSIO-520-U: {{convert|300|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-UB: {{convert|300|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-VB: {{convert|325|hp|kW|0|abbr=on}}<ref name="E8CE"/> ;TSIO-520-WB: {{convert|325|hp|kW|0|abbr=on}}<ref name="E8CE"/>
===GTSIO-520=== ;GTSIO-520-C: {{convert|340|hp|kW|0|abbr=on}}<ref name="E7CE">{{cite web|url = https://drs.faa.gov/browse/excelExternalWindow/37202859DA7B25CF862588C300651C09.0001|title = Type Certificate Data Sheet No. E7CE Revision 20|access-date = 8 November 2022|author = Federal Aviation Administration|author-link = Federal Aviation Administration|date = 8 September 2022|archive-url= https://archive.today/20221108135206/https://drs.faa.gov/browse/excelExternalWindow/37202859DA7B25CF862588C300651C09.0001%3FmodalOpened%3Dtrue?modalOpened=true|archive-date= 8 November 2022|url-status= live}}</ref> (Beech V35 Bonanza, conversion to V35TC) ;GTSIO-520-D: 375 hp (280 kW)<ref name="E7CE"/> (Cessna 421) ;GTSIO-520-F: {{convert|435|hp|kW|0|abbr=on}}<ref name="E7CE"/> ;GTSIO-520-H: 375 hp (280 kW)<ref name="E7CE"/> (Cessna 421B) ;GTSIO-520-K: {{convert|435|hp|kW|0|abbr=on}}<ref name="E7CE"/> ;GTSIO-520-L: 375 hp (280 kW)<ref name="E7CE"/> (Cessna 421C) ;GTSIO-520-M: 375 hp (280 kW)<ref name="E7CE"/> (Cessna 404) ;GTSIO-520-N: 375 hp (280 kW)<ref name="E7CE"/> (Cessna 421C) ;GTSIO-520-S: 375 hp (280 kW)<ref name="E7CE"/> (Tecnam P2012 Traveller)
==Applications== {{columns-list|colwidth=30em| *Aero Commander 685 *Beechcraft Bonanza *Beechcraft Baron 58P *Bellanca Skyrocket II *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 *Tecnam P2012 Traveller *Viper Aircraft Viperfan *Wise GT-400 }}
==Specifications (GTSIO-520-D)== {{pistonspecs| <!-- If you do not understand how to use this template, please ask at Wikipedia talk:WikiProject Aircraft --> <!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with )</li> and start a new, fully-formatted line with <li> --> |ref=''Continental Motors.''<ref>[http://www.tcmlink.com/EngSpecSheetDocs/GTSIO520D.pdf Product data sheet GTSIO-520-D] {{webarchive|url=https://web.archive.org/web/20060717002547/http://www.tcmlink.com/EngSpecSheetDocs/GTSIO520D.pdf |date=2006-07-17 }} Retrieved: 21 November 2012</ref> |type=6-cylinder horizontally opposed aircraft engine |bore={{cvt|5.25|in}} |stroke={{cvt|4.00|in}} |displacement={{cvt|520|cuin|L|1}} |length=63.63 in (161.6 cm) |diameter= |width=34.04 in (86.5 cm) |height=26.63 in (67.6 cm) |weight=484 lb (219.5 kg) without accessories |valvetrain=Overhead valve |supercharger= |turbocharger= |fuelsystem=TCM fuel injection |fueltype=100/130 Octane avgas |oilsystem= |coolingsystem=Air-cooled |power=375 hp (280 kW) (Maximum continuous operation at 3,400 rpm) |specpower= |compression=7.5:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=0.77 hp/lb (1.27kW/kg) |designer= |reduction_gear= |general_other= |components_other= |performance_other= }}
==See also== * List of aircraft engines
==References== {{Reflist}}
==External links== {{Commons category inline}}
{{Continental aeroengines}}
Category:1960s aircraft piston engines O-520 Category:Boxer engines Category:Six-cylinder engines Category:Air-cooled aircraft piston engines