Wartsila Marine Power is launching a radical de-rating programme for two-stroke engines that can cut fuel consumption by up to 15% and help older ships comply with Carbon Intensity Indicator (CII) regulations as they get tougher.

The Wartsila Fit4Power conversion is aimed at its engines fitted to large containerships built from around 2005 that may have problems complying with CII because they were built for high-speed operation.

The scheme, which in effect rebuilds and replaces components for the top sections of the RT-flex96C engines, reduces their bore size by 25%, significantly improving combustion efficiency and cutting emissions, according to Wartsila.