MAN Diesel & Turbo has announced the successful test bed trials of its first super-long-stroke, 90-cm bore Mark 9 engine (S90ME-C9.2) at Hyundai Heavy Industries Engine and Machinery Division.

The largest two-stroke engine ever designed by MAN Diesel & Turbo delivers a torque of 8.5 million Nm rpm and has a total output of 69,720 kW. The S90ME-C9.2 conforms to the new Energy Efficiency Design Index (EEDI), which requires new vessels to reduce the impact of CO2 emissions by reducing fuel consumption and running at slower speeds.

Since 2008, shipowners have been investigating how operating costs can be reduced, and MAN Diesel & Turbo have been working on a method to optimise propulsion efficiency by using lower propeller speeds by using longer-stroke engines.

In addition to the basic optimisation of the propulsion plant, the S90ME-C9.2 engine is delivered with three different MCR optimisations: High-rated MCR with part load optimisation, De-rated MCR optimisation with part-load tuning and De-rated MCR optimisation with low-load tuning.

The S90ME-C9.2 engine will be installed on a container vessel built at Samsung Heavy Industries for Orient Overseas Container Line (OOCL).