Straight-nine engine

Last updated July 11, 2025

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). Archived from the original on 2012-07-30.
↑ "The Sulzer RT-fl ex Common-Rail System Described" (PDF). Wärtsilä. August 2004. p. 2. Retrieved 2025-01-24.

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[1] "Historie om bedriften" [Company history]. FF klubben (in Norwegian). Archived from the original on 2012-07-30.

[2] "The Sulzer RT-fl ex Common-Rail System Described" (PDF). Wärtsilä. August 2004. p. 2. Retrieved 2025-01-24.

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