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MAN Diesel & Turbo successfully tests new super-long-stroke, low-speed two-stroke diesel for container ships; 8.5 million N·m

MAN Diesel & Turbo announced that its first super-long-stroke, 90-cm bore Mk 9 engine has successfully completed test bed trials at Hyundai Heavy Industries Engine & Machinery Division. Physically the largest two-stroke engine ever designed by MAN Diesel & Turbo, the engine will deliver a massive torque of 8.5 million N·m (6.3 million lb-ft) at 84 rpm and has a total output of 69,720 kW (93,500 hp). The S90ME-C9.2 covers the new trend in container shipping demanding smaller bore, super-long-stroke engines with lower propeller speeds.

First S90ME-C9.2 unit successfully tested at Hyundai Heavy Industries Engine & Machinery Division in Korea. Click to enlarge.

The engine has been built by one of world’s major two-stroke engine builders, Hyundai Heavy Industries, and it will be installed on a container vessel built at Samsung Heavy Industries for Orient Overseas Container Line (OOCL), a Hong Kong-based container shipping company recognized for focusing on sustainable and environmental friendly technology advancements.

Since the beginning of the global economical crisis in late 2008, MAN Diesel & Turbo has experienced that shipowners are investigating possibilities for reducing operating costs, through measures such as low-load optimization of engines, slow steaming and operation with turbocharger cut-out. These tendencies led MAN Diesel & Turbo to offer possibilities supporting optimized propulsion efficiency by way of lower propeller speeds by using longer-stroke engine designs.

This, in combination with the need to meet the newly introduced Energy Efficiency Design Index, EEDI, made MAN Diesel & Turbo develop the MAN B&W super-long-stroke S90ME-C9.2. Developed specifically for container ships, the S90ME-C9.2 is based on the VLCC-optimized S90ME-C8, which in the meantime also found applications in a number of container ships.

Furthermore, the G series of engines with even larger stroke to bore ratios, has been made available, with G40, G45, G50, G60, G70, and G80 type engines supporting the tendency of using lower propeller speeds with a super-long stroke for all ocean-going ship types.

In addition to the basic optimization of the propulsion plant for container ship operation, by using the low propeller speed supported by the S90ME-C9.2 engine, the engine is delivered with the following three different maximum continuous rating (MCR) optimizations:

  • High-rated MCR with part-load optimization;
  • De-rated MCR optimization with part-load tuning; and
  • De-rated MCR optimization with low-load tuning.



NG dual fueling is great for diesels in marine or stationary power generation. Ideal for CHP too.


I expected someone to claim this would make a great range extender engine.


How about more robust con rods and bearings, get it up to 3000 rpm and get 3 million hp?

Roger Pham

Range-extender engine needs to be light-weight and compact to minimize dead weight and dead space consumption. Maximum efficiency is not too important when the engine is only used occasionally for longer trips.

The limitation of engine rpm is in the piston speed. Usually 10 m/sec is practical upper limit for diesel engine for endurance.

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