A new ultra low emission version of Wärtsilä’s 310-bore dual-fuel engine claims to reduce methane slip by up to 41% compared with the previous Wärtsilä 31DF engine. The new version, which has been added to Wärtsilä’s product portfolio with immediate effect, will set a new standard for methane slip emissions for 4-stroke dual-fuel engines.

The new version of the Wärtsilä 31DF is being added as a specifiable option for new Wärtsilä 31DF main mover orders from 1 November 2023. The ultra low emisison solution is also being offered as an option for genset orders for constant speed Wärtsilä 31DF gensets, which cover electric propulsion installations.

Wärtsilä is understood to be developing the ultra-low emissions solution for variable speed installations, and plans to add the option to its portfolio in the future.

The engine builder noted that the new version of the Wärtsilä 31DF engine will not alter the Wärtsilä 31 outline dimensions, and that the new version would not require any additional off-engine module or aftertreatment system.