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A straight-nine engine or inline-nine engine is a straight engine with nine cylinders. Straight-nine engines are usually diesel engines used for ship propulsion. Rolls-Royce Marine Engines (formerly Bergen Diesel), Pielstick and Wärtsilä (formerly Wichmann) have made this type of engine.

Straight-nine engines in current production include models in the Rolls-Royce Bergen B, C and K series, and the Wärtsilä RT-flex60C-B, RT-flex82C, RTA84T-D, RTA84C, RTA96C, 20, 26, 32, Wasa32LN, 38, 46 and 46F series. The nine cylinder versions of these engines develop power outputs from 1,620 kilowatts (2,200 PS; 2,170 hp) to 51,480 kW (69,990 PS; 69,040 hp).

See Also

Piston engine configurations
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Type BourkeTemplate:· Controlled combustionTemplate:· DelticTemplate:·OrbitalTemplate:· PistonTemplate:· Pistonless (Wankel)Template:· RadialTemplate:· RotaryTemplate:· SingleTemplate:· Split cycleTemplate:· StelzerTemplate:· Tschudi
Inline types H · U · Square four · VR · Opposed · X
Stroke cycles Two-stroke cycleTemplate:· Four-stroke cycleTemplate:· Six-stroke cycle
Straight Single · 2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 14
Flat 2 · 4 · 6 · 8 · 10 · 12 · 16
V 4 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 24
W 8 · 12 · 16 · 18
Valves Cylinder head portingTemplate:· CorlissTemplate:· SlideTemplate:· ManifoldTemplate:· MultiTemplate:· PistonTemplate:· PoppetTemplate:· SleeveTemplate:· Rotary valveTemplate:· Variable valve timingTemplate:· Camless
Mechanisms CamTemplate:· Connecting rodTemplate:· CrankTemplate:· Crank substituteTemplate:· CrankshaftTemplate:· Scotch YokeTemplate:· SwashplateTemplate:· Rhombic drive
Linkages EvansTemplate:· Peaucellier–LipkinTemplate:· Sector straight-lineTemplate:· Watt's (parallel)
Other HemiTemplate:· RecuperatorTemplate:· Turbo-compounding