The Wärtsilä 31 is a medium-speed 4-stroke marine engine that is designed to set a new benchmark in efficiency and overall emissions performance. Available in cylinder configurations from 8 to 16 and with a power output ranging from 4.6 to 10.4 MW at 720 and 750 rpm, the Wärtsilä 31 provides the best fuel economy of any engine in its class. At the same time, it maintains outstanding performance across the complete operating range. Its high-power output per cylinder helps you save space and the extended service interval together with high up-time helps you save in maintenance. The engine is available in diesel, dual fuel and pure gas versions.
Wärtsilä 31 is recognised by Guinness World Records as the world's most efficient 4-stroke diesel engine.
The Wärtsilä 31 retains its high efficiency and environmental values throughout the entire lifecycle of the vessel.
Wärtsilä 31 is a perfect solution for ferries where operational flexibility, high power density, long intervals between overhauls, and high levels of safety are of paramount importance. Also fishing vessel and luxury cruise ship owners appreciate the Wärtsilä 31’s low noise emissions. The Wärtsilä 31 is designed to be suitable for a broad range of ship types and applications, in diesel electric configurations or as an auxiliary engine. And as the engine is available in diesel, dual fuel and pure gas versions you can easily choose a configuration that matches your requirements.
Get technical data and system proposals for designing W31 and W31DF marine engine installations.