Wärtsilä launched its new low-speed X-generation engine series in May 2011. This series employs Wärtsilä’s common-rail RT-flex technology, and incorporates additional features designed to meet the emerging needs of the fast-changing shipping sector. Wärtsilä X series engines feature an extra-long stroke that achieves improved fuel economy. Furthermore, optimum propeller requirements can be satisfied within the rating field provided. Originally introduced as the Wärtsilä RT-flex35 and RT-flex40 engines, it was decided to change the names in order to align the Wärtsilä product portfolio in a consistent way.

We believe that this series of electronically controlled low-speed, two-stroke engines is absolutely in line with the current and future needs of the marine sector. In particular it meets the requirements set by coastal and river transportation vessels. China is one of the key markets for this engine, and the fact that it is manufactured by our licensee YCMP is indicative of our commitment to further strengthening our presence in the Chinese market.

—Martin Wernli, President Wärtsilä Switzerland and Vice President Product Centre 2-stroke

The first Wärtsilä X35 engine was produced at YCMP’s new 48,000 m² factory, which is one of Wärtsilä’s low-speed engine licensees, located in Zhuhai on the southern estuary of the Zhujiang Delta in Guangdong Province. The Zhujiang Delta is the third largest shipbuilding area in China, and is an area targeted by the Chinese government for further shipbuilding development.