Straight-nine engine

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.

Examples

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).

References

Reciprocating engines and configurations

Type

Stroke cycles

Configurations
& number of cylinders

Single cylinder	Single

Two cylinders	Split-single I2 V2 F2

Inline / straight	I2 I3 I4 I5 I6 I7 I8 I9 I10 I12 I14

Flat	F2 F4 F6 F8 F10 F12 F16

V / Vee	V2 V3 V4 V5 V6 V8 V10 V12 V14 V16 V18 V20 V24

W	W8 W12 W16 W18

Other inline	H U Square four VR Opposed X Junkers Jumo 222

Components

Valves	Cylinder head porting Corliss Intake Exhaust Multi Overhead Piston Poppet Side Sleeve Slide Rotary valve Variable valve timing Camless Desmodromic

Fuel supplies	Carburetor Gasoline direct injection Common rail

Mechanisms	Cam Camshaft Overhead camshaft Connecting rod Crank Crankshaft Scotch yoke Swashplate Rhombic drive

Linkages	Peaucellier–Lipkin Watt's (parallel)

Other	Hemi Recuperator Turbo-compounding

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