# 2si

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> Source: https://en.wikipedia.org/wiki/2si
> Source revision: 1349525254
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Defunct American engine manufacturer}}
{{Use dmy dates|date=January 2022}}
{{Use American English|date=January 2022}}
{{Infobox company
| name = 2 Stroke International
| logo = 2si Logo.jpg
| type = Private company
| genre = 
| fate = Out of business 2014
| foundation = 
| founder = 
| location_city = [Beaufort, South Carolina](/source/Beaufort%2C_South_Carolina)
| location_country = [United States](/source/United_States)
| location = 
| locations = 
| area_served = 
| key_people = 
| industry = [Engine](/source/Engine) [manufacturing](/source/manufacturing)
| products = Two-stroke engines
| services = 
| market cap = 
| revenue = 
| operating_income = 
| net_income = 
| assets = 
| equity = 
| owner = 
| num_employees = 
| parent = AMW Cuyuna Engine Company
| divisions = 
| subsid = 
| homepage = [http://www.2si.com/ www.2si.com]
| footnotes = 
| intl = 
}}

'''2si''', or '''2 Stroke International''', was an American engine manufacturer located in [Beaufort, South Carolina](/source/Beaufort%2C_South_Carolina). The company was a wholly owned subsidiary of the AMW Cuyuna Engine Company, formerly known as the ''Cuyuna Development Company''.<ref name="Cliche">Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-2 Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}}</ref><ref name="About2si">{{cite web|url = http://www.2si.com/2si_company_profile.htm|title = 2si Company Profile|accessdate = 2010-02-16|last = Two Stroke International|date = n.d.|archiveurl = https://web.archive.org/web/20100115032358/http://www.2si.com/2si_company_profile.htm|archivedate = 2010-01-15|url-status = dead}}</ref><ref name="Aerocrafter">Purdy, Don: ''AeroCrafter - Homebuilt Aircraft Sourcebook'', page 69. BAI Communications. {{ISBN|0-9636409-4-1}}</ref><ref name="Cuyuna">Cuyuna Development Company: ''Cuyuna Engines'',  Cuyuna Development Company, undated</ref>

The company acquired a line of two-stroke engines that were originally designed and produced by ''JLO'' of [Germany](/source/Germany) and marketed them under the ''Cuyuna'' brand name for [snowmobile](/source/snowmobile) and later [ultralight aircraft](/source/ultralight_aircraft) use. Later Cuyuna formed a subsidiary ''Two Stroke International'', commonly known as ''2si'', to produce and market the engine line. Cuyuna ended selling engines for aircraft use, but instead switched to marketing them only for industrial, marine, [auto racing](/source/auto_racing), [kart](/source/kart) and [all-terrain vehicle](/source/all-terrain_vehicle) applications.<ref name="Cliche" /><ref name="Applicatins2si">{{cite web|url = http://www.2si.com/2si_applications.htm|title = Applications|accessdate = 2010-02-16|last = Two Stroke International|date = n.d.|archiveurl = https://web.archive.org/web/20100317034839/http://www.2si.com/2si_applications.htm|archivedate = 2010-03-17|url-status = dead}}</ref>

The company seems to have gone out of business in 2014.

== Engines ==
*[215](/source/2si_215) - aircraft, multifuel, industrial engine
*[230](/source/2si_230) - aircraft, multifuel, industrial engine
*[340](/source/Cuyuna_340) - aircraft engine
*[430](/source/Cuyuna_430) - aircraft and snowmobile engine
*[460](/source/2si_460) - aircraft, multifuel, marine, industrial and sport vehicle engine
*[500](/source/2si_500) - sport vehicle engine
*[540](/source/2si_540) - aircraft and sport vehicle engine
*[690](/source/2si_690) - aircraft, marine, industrial engine
*[808](/source/2si_808) - aircraft engine

==See also==
{{aircontent
<!-- include as many lines are appropriate. additional lines/entries with carriage return. -->
|see also=
*[List of aircraft engines](/source/List_of_aircraft_engines)
*[Hirth](/source/Hirth)
*[Rotax](/source/Rotax)
|related=<!-- related developments -->
|similar aircraft=<!-- similar or comparable aircraft -->
|lists= 
}}

==References==
{{Reflist}}

==External links==
*[https://web.archive.org/web/*/www.2si.com Company website archives] on [Archive.org](/source/Archive.org)
{{2si}}

Category:Defunct aircraft engine manufacturers of the United States

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Adapted from the Wikipedia article [2si](https://en.wikipedia.org/wiki/2si) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2si?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.