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Straight-nine engine

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The straight-nine engine (also referred to as an inline-nine engine, abbreviated as I9 or L9) is a piston engine with nine cylinders arranged in a straight line along the crankshaft. The most common application is for large diesel engines used by ships.

Examples of straight-nine engines include:

Rolls-Royce Bergen B, C and K series^[1]
Wärtsilä RT-flex60C-B,^[2] RT-flex82C, RTA84T-D, RTA84C, RTA96C, 20, 26, 32, Wasa32LN, 38, 46 and 46F series

References

↑ "Historie om bedriften" [Company history]. FF klubben (in Norwegian).{{cite web}}: CS1 maint: deprecated archival service (link)
↑ "The Sulzer RT-fl ex Common-Rail System Described" (PDF). Wärtsilä. August 2004. p. 2. Retrieved 2025-01-24.

Engine configurations for piston engines

Type

Cylinder
layout

Inline – straight	I1 I2 I3 I4 I5 I6 I7 I8 I9 I12 I14
Flat – boxer	F2 F4 F6 F8 F10 F12 F16
V – vee	V2 V3 V4 V5 VR5 V6 VR6 V8 V10 V12 V14 V16 V18 V20 V24
W	W3 W6 W8 W12 W16 W18 W24 W30
Deltic H Radial Split-single U X

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