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A straight-seven engine or inline-seven engine is a
A straight-seven engine or inline-seven engine is a straight engine
The straight or inline engine is an internal combustion engine with all cylinders aligned in one row and having no offset. Usually found in four, six and eight cylinder configurations, they have been used in automobiles, locomotives and aircraft ...
with seven cylinder
A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
A cylinder may also be defined as an infin ...
s. It is more common in marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
applications because these engines are usually based on a modular design, with individual heads per cylinder.
Marine engines
Straight-seven engines produced for marine usage include: *Wärtsilä-Sulzer RTA96-C
The Wärtsilä RT-flex96C is a two-stroke turbocharged low-speed diesel engine designed by the Finnish manufacturer Wärtsilä. It is designed for large container ships that run on heavy fuel oil. Its largest 14-cylinder version is 13.5 meters ...
two-stroke crosshead
In mechanical engineering, a crosshead is a mechanical joint used as part of the slider-crank linkages of long reciprocating engines (either internal combustion or steam) and reciprocating compressors to eliminate sideways force on the piston. ...
diesel engine
* Wärtsilä 32 trunk piston
A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tigh ...
engines
* ''MAN Diesel IMO'' two-stroke crosshead diesel engine
* ''Burmeister & Wain 722VU37'' two-stroke diesel engine (commenced 1937, used in the Danish ''Havmanden-class'' submarines
* ''Sulzer 7QD42'' diesel engine (1939-1940, used in the Dutch O 21-class submarine
The ''O 21'' class was a class of seven submarines, built for the Royal Netherlands Navy. The boats were still incomplete at the start of the German invasion of the Netherlands ''O 21'', ''O 22'', ''O 23'' and ''O 24'' were hastily launched and es ...
s).
Land use
The ''AGCO Sisu'' is a straight-seven diesel engine that was released in 2008. Intended for farming machinery, the engine shares various components with the company's straight-six engine.References
Straight-07 Seven-cylinder engines Straight-07 {{Mech-engineering-stub