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The straight-nine engine (also referred to as an inline-nine engine; abbreviated 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
• Wärtsilä RT-flex60C-B, RT-flex82C, RTA84T-D, RTA84C, RTA96C, 20, 26, 32, Wasa32LN, 38, 46 and 46F series

References

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