The Wärtsilä 31 was originally introduced in 2015 and was recognised by Guinness World Records as being the world’s most efficient 4-stroke diesel engine. In addition to its exceptionally high efficiency, the engine’s economic fuel consumption in turn results in lower levels of exhaust gas emissions.

“With this power upgrade we are delivering significant added value to our customers,” explained Lars Anderson, Director of Product Management at Wärtsilä. “The Wärtsilä 31 is already the best engine in its class, and this development widens its market advantage even further. By extending its performance, we are making a real contribution to greater sustainability and supporting our commitment to a decarbonised future.”

The first deliveries of the upgraded engine are taking place during the first half of 2023. Already, seven higher power output Wärtsilä 31 engines have been contracted.

The power upgrade will result in the current output range of 4.9 to 9.8 MW, being increased to a range of 5.2 to 10.4 MW with 650 kW per cylinder. The power increase gives customers the option to select fewer cylinders, thereby reducing the required engine room space, as well as lessening maintenance requirements.

The Wärtsilä 31 has proven to be extremely popular for installation on a broad range of vessel types, including among others, fishing vessels, ice breakers, ferries, cruise vessels, cable layers, and catamarans.