The Wärtsilä 31 is an efficient medium-speed 4-stroke marine engine that provides the best fuel economy of any engine in its class. It is 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. What’s more, it maintains its outstanding performance across the complete operating range.
It saves space because of its high-power output per cylinder. You will save time and money on maintenance thanks to its extended service interval and its high up-time.
The Wärtsilä 31 engine is available in diesel, dual fuel and pure gas versions.
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.
The Wärtsilä 31DF presents a new era for dual fuel engines with its ultra-low emissions when operating in gas mode. Get the same high output power than before and further reduce methane slip by up to 85 %. Besides you can remove nearly all NOx emissions.
The ultra-low emissions version of the engine is available for constant speed applications.
reduction in methane
reduction in nitrogen oxides
reduction in greenhouse gas
CO2-eq (GWP 100)
Further emission reductions achieved on 50% load with the Wärtsilä 31DF ultra low emission version in gas mode compared to the standard Wärtsilä 31DF
Get technical data and system proposals for designing W31 and W31DF marine engine installations.
Discover the benefits others have already gained from Wärtsilä 31 engine.