Skip to main content


Monday, May 25, 2020 

Wärtsilä has launched a new FuelFlex Injection Control Unit (ICU) as an upgrade for RT-flex type two-stroke diesel engines which will enable reliable operation on both residual and low-viscosity marine fuels.

The company says this has been necessitated through the increased use of low-sulphur-content fuels in order to be compliant with IMO 2020 sulphur emission regulations. The upgrade is available for retrofitting on vessels with Wärtsilä RT-flex96C-B and RT-flex84T-D two-stroke engines.

ICUs deliver a precisely controlled quantity of fuel into the cylinder at timed intervals, thereby ensuring efficient combustion at any engine load. The accuracy of the fuel metering and injection timing can be affected by leakages in the piston and valves within the ICU, with the fuel viscosity, pressure differential and clearances having an impact on the amount of leakage. The upgraded Wärtsilä Injection Control Unit is designed to address such issues.

Earlier generation ICUs were designed for continuous operation with residual fuels, and their long-term use with mainly low-viscosity fuels has been found to result in the risk of shorter component life. The new FuelFlex ICU features a robust design with more durable materials and other improvements providing better resistance against leakage, while maintaining the designed service life expectancy of the component.

“The latest FuelFlex ICU is a retrofit solution for customers that will increase both the reliability and environmental sustainability of their two-stroke engines. It also enables more flexible onboard maintenance of the unit, and the validation tests carried out have been very successful,” said Jung Yong Park, Product Manager, two-Stroke & Specialised Services, Wärtsilä Marine.

Reader Comments (0)

There are currently no comments on this article. Why not be the first and leave your thoughts below.

Leave Your Comment

Please keep your comment on topic, any inappropriate comments may be removed.

Return to index

Web Analytics