Straight-twelve engine

File:Wolseley 12 cylinder 360hp petrol or oil marine engine (Rankin Kennedy, Modern Engines, Vol III).jpg straight-12, 360 hp, petrol or oil marine engine]]

A straight-12 engine or inline-12 engine is a twelve-cylinder piston engine with all twelve cylinders mounted in a straight line along the crankcase.

Land use

Due to the very long length of a straight-twelve engine, they are rarely used in automobiles. The first known example is a {{convert|7.2|L|cuin}} engine in the 1920 French Corona car;{{cite book|last1=Burgess Wise|first1=David|title=The Illustrated Encyclopedia of Automobiles|date=1979|publisher=New Burlington Books|isbn=0-906286-16-6|page=131}} however it is not known if any cars were sold. Packard also experimented with an automobile powered by an inline 12 in 1929.{{cite web|url=http://theoldmotor.com/?p=134254|title=The Long-Lost Experimental Packard Straight Twelve - The Old Motor|website=theoldmotor.com|date=4 December 2014 }}

The straight-12 has also been used for large military trucks.{{citation needed|date=December 2022}}

Marine use

Some Russian firms built straight-12s for use in ships in the 1960s and 1970s.

MAN Diesel & Turbo 12K98ME and 12S90ME-C and the Wärtsilä-Sulzer RTA96-C are examples of contemporary marine engines in L-12-cylinder configuration. These are popular for propulsion in container ships.{{Cite web |url=http://www.dieselarmy.com/engine-tech/engine/worlds-largest-diesel-series-mans-record-breaking-12s90me-c/ |title=World's Largest Diesel: MAN's Record-Breaking 12S90ME-C |access-date=2017-05-31 |archive-date=2017-06-14 |archive-url=https://web.archive.org/web/20170614205550/http://www.dieselarmy.com/engine-tech/engine/worlds-largest-diesel-series-mans-record-breaking-12s90me-c/ |url-status=dead }}{{Cite web |url=http://marine.man.eu/docs/default-source/shopwaredocuments/marine-engine-programme-2217.pdf |title=Archived copy |access-date=2017-05-31 |archive-date=2017-05-17 |archive-url=https://web.archive.org/web/20170517065155/http://marine.man.eu/docs/default-source/shopwaredocuments/marine-engine-programme-2217.pdf |url-status=dead }}

References

Category:Piston engine configurations

Category:12-cylinder engines