Editing W18 engine

{{Short description|Piston engine with 18 cylinders in W configuration}}
{{multiple image
| align             = right
| direction         = vertical
| width             = 220
| image1            = Mercedes-d-vi.jpg
| caption1          = 1915 [[Mercedes D.VI]] 517 hp aeroengine
| image2            = Motore Isotta Fraschini Asso 750 040.jpg
| caption2          = 1930s [[Isotta Fraschini Asso 750]] aircraft engine
| image3            = Tatra T955 engine.JPG
| caption3          = 1943 [[Tatra (company)|Tatra]] T955 prototype diesel aircraft engine
}}

A '''W18 engine''' is an eighteen-cylinder [[piston engine]] with three banks of six cylinders in a [[W engine|W configuration]].

The W18 layout is rarely used, with the only production examples being several aircraft during the 1920s and 1930s. Prototype W18 engines were produced for concept cars predecessors to the Bugatti Veyron in the late 1990s.

==Aircraft usage==
The first example was the German [[Mercedes D.VI]] aeroengine, which were built since 1915.
A later example is the 1929 [[Hispano-Suiza 18R]], an aircraft racing engine produced in limited quantities in France.<ref>{{cite web |title=Hispano-Suiza 18R and 18Sb Aircraft Engines |url=https://oldmachinepress.com/2013/07/25/hispano-suiza-18r-and-18sb-aircraft-engines/ |website=www.oldmachinepress.com |access-date=4 November 2019 |language=en |date=25 July 2013}}</ref> This was followed in 1934 by the [[Isotta Fraschini Asso 750]], which was built in Italy and used in several flying boats.<ref>{{cite web |title=CAD Images by Ugo Vicenzi |url=http://www.enginehistory.org/vicenzi.htm |website=www.enginehistory.org |archive-url=https://web.archive.org/web/20071221033436/http://www.enginehistory.org/vicenzi.htm |archive-date=21 December 2007 |url-status=dead}}</ref> The Asso 750 was water-cooled and used an angle of 60 degrees between banks. The 1943 Tatra T955 was a prototype diesel aircraft engine which used a W18 layout.{{citation needed|date=November 2019}}

==Automotive usage==
The W18 layout has been considered for use in motor vehicles by two manufacturers, although neither reached production. In 1967, [[Scuderia Ferrari]] built a prototype [[W3 engine]] as a feasibility study for a {{convert|3.0|L|cuin|0|abbr=on}} W18 engine to use in Formula One.<ref name="Ludvigsen, P3C" >{{Cite book
 |title=The V12 Engine
 |last=Ludvigsen |first=Karl
 |author-link=Karl Ludvigsen
 |publisher=Haynes Publishing
 |location=Sparkford, Yeovil
 |year=2005
 |isbn=1-84425-004-0
 |ref={{harvid|Ludvigsen|V12 Engine}}
  |pages=356–357
}}</ref> In the late 1990s, the [[Bugatti EB 118]], [[Bugatti EB 218]], [[Bugatti 18/3 Chiron]] and [[Bugatti Veyron#Origins|Bugatti EB 18/4 Veyron]] concept cars were fitted with W18 engines,<ref>{{cite web |title=Bugatti's First Chiron Was A Lamborghini Diablo With A W18 Engine |url=https://www.carthrottle.com/post/bugattis-first-chiron-was-a-lamborghini-diablo-with-a-w18-engine/ |website=www.carthrottle.com |access-date=4 November 2019 |language=en}}</ref><ref>{{cite web |title=Volkswagen Made An Even Weirder Engine Before The Bugatti W16 |url=https://jalopnik.com/volkswagen-made-an-even-weirder-engine-before-the-bugat-1823281378 |website=www.jalopnik.com |access-date=4 November 2019}}</ref> prior to the production version of the Bugatti Veyron using a [[W16 engine]] instead.
{{clear right}}

==Marine usage==
The W18 layout has been used on the high seas; [http://www.crmmotori.it/interna.asp?tema=16 CRM Motori SpA marine engines].

==References==
{{Reflist|30em}}
{{Commons category|W18 engines}}

{{Piston engine configurations}}
[[Category:Piston engine configurations]]
[[Category:W engines|18]]