Editing V18 engine

{{Short description|Piston engine with 18 cylinders in vee configuration}}
[[File:Montreal power backup.jpg|thumb|A {{convert|3400|hp|MW|abbr=on|lk=on}} [[ALCO 251|ALCO 18-251]] engine being used as a backup electrical generator at a wastewater plant in Montreal.]]

A '''V18 engine''' is an eighteen-cylinder [[Internal combustion engine#Reciprocating engines|piston engine]] where two banks of nine cylinders are arranged in a [[V engine|V configuration]] around a common crankshaft.

The V18 engine is a rare configuration and is primarily used in large [[Diesel engine|diesel]] engines running at low operating speeds. These large V18 diesel engines have seen limited use in [[haul truck]]s, [[electricity generation]], [[rail transport]], and [[marine propulsion]]. 

There are no known automobiles that have used V18 engines and no engine manufacturer has developed or produced a V18 engine for use in automobiles.

While the V18 is a more uncommon engine configuration, there are more common eighteen-cylinder engine configurations such as the [[W18 engine|W18]], which has seen use in both automobiles and aircraft, and the [[Napier Deltic|Deltic]], an opposed-piston eighteen-cylinder diesel engine created by [[D. Napier & Son]] which was used for a variety of applications.

== Examples ==
{| class="wikitable"
|-
! Name !! [[Engine displacement|Displacement]] !! [[Power (physics)|Power]] output !! Fuel !! Notes
|-
| [[ALCO 251|ALCO 18-251]]<ref name=18-251>{{cite web|title=Power Solutions: 251 Diesel Engines|url=http://www.fairbanksmorse.com/file_system/fmalco251brochure.pdf|work=Fairbanks Morse Engine|access-date=26 June 2011}}</ref> || {{convert|12024|cuin|L|abbr=on}} || {{convert|4500|hp|MW|2|abbr=on}} || [[Diesel fuel|Diesel]] || Originally designed and manufactured by<br /> [[American Locomotive Company]]; now manufactured by<br /> [[Fairbanks-Morse|Fairbanks Morse Engine]].<ref name=18-251 /> 
|-
|[[Caterpillar Inc.|Caterpillar]] 3618 || 20,320 cu in     (333 L) || 9,655&nbsp;hp (7.2 MW) || Diesel || Out of production
|-
| [[Cummins]] QSK78<ref name=qsk78>{{cite web|title=Cummins QSK78|url=http://cumminsengines.com/every/applications/mining/qsk78_mine.page|work=Cummins|access-date=25 June 2011}}</ref> || {{convert|4735|cuin|L|abbr=on}} || {{convert|3500|hp|MW|2|abbr=on}} || Diesel || Derived from the [[V16 engine|V16]] QSK60.<ref name=qsk78 /> <br /> Marketed by [[Komatsu Limited|Komatsu]] as the SSDA18V170.<ref name=komatsu>{{cite web|title=New Engine - Rated 3500 horsepower at any altitude|url=http://hutnyak.com/MINExpo/MINExpoReport2000.htm#New%20Engine|work=MINExpo Report|access-date=26 June 2011}}</ref>
|-
| [[Fairbanks Morse]] Colt-Pielstick PC2.5 || 63,510 cu in (1,040 L) || 11,700&nbsp;hp (8.73 MW) || Diesel || In production
|-
| [[MAN SE|MAN]] V32/44CR || 39,055 cu in (643 L) || 14,483&nbsp;hp (10.8 MW) || Diesel || In production 
|-
| [[Wärtsilä]] 18V50DF<ref name="18v50df">{{cite web|title=Wärtsilä 50DF|url=https://www.wartsila.com/products/marine-oil-gas/engines-generating-sets/dual-fuel-engines/wartsila-50df|work=Wärtsilä|access-date=2 August 2017}}</ref> || {{convert|125000|cuin|L|abbr=on}} || {{convert|23530|hp|MW|2|abbr=on}} || Diesel or<br />[[natural gas]] || Available for both marine propulsion and power generation, and used in e.g. [[Humboldt Bay]] power station.<ref>[http://www.industrialmarinepower.com/-3-107-humboldt-bay-usa-power-plant-wartsila-18v50df--natural-gas.html Humboldt Bay, USA Power Plant Wartsila 18V50DF Natural Gas]. Industrial Marine Power Forum. {{retrieved | access-date=2011-10-22}}</ref>
|-
|[[Paxman (engines)|Paxman]] [[Paxman Valenta#Usage|Valenta 18RP200]]
|7,230 cu in (118.44 L)
|4,901 hp (3,655 MW)
|Diesel
|Out of production, used for marine propulsion and power generation.<ref>{{Cite web |title=Paxman History Pages - Valenta and VP185 Applications |url=https://paxmanhistory.org.uk/applics1.htm#y3j |access-date=2024-09-30 |website=paxmanhistory.org.uk}}</ref>
|}

The [[BelAZ 75600]] and [[Liebherr T 282B]] haul trucks are powered by the ''Cummins QSK78'' engine, while the [[Komatsu 960E-1]] haul truck is powered by the ''Komatsu SSDA18V170'' engine.

In 1971, the Canadian locomotive manufacturer [[Montreal Locomotive Works#MLW-Worthington|MLW-Worthington]] produced the ''MLW M640'' prototype [[Diesel–electric transmission|diesel-electric]] [[locomotive]] powered by a {{convert|4000|hp|MW|abbr=on|lk=on}}[[ALCO 251|ALCO 18-251]] engine, however the locomotive did not reach production.

== See also ==
* [[W18 engine]]

== References ==
{{reflist}}

{{Piston engine configurations}}

[[Category:V18 engines| ]]
[[Category:Piston engine configurations]]
[[Category:V engines|18]]