MEDIUM-SPEED ENGINES
Engine programme expansion A
SERIES of small bore and medium-sized two-stroke engines, plus a new medium-
speed common rail diesel engine, have been launched by MAN Diesel. The 50cm-bore MAN B&W S50ME-B engine series is available in three different versions, marks 7, 8, and 9, in addition to the existing S35ME-B, S40ME-B, and S50 ME-C/MC-C/MC ranges. MAN Diesel is using the ME-B series to
broaden the application of the ME concept, using the electronic fuel-injection control already introduced in its large-bore engines. Mark 7 and 8 variants are claimed to have cost benefits in their power bracket, enabling existing ship designs installed with the S50MC-C to benefit where application of the advanced S50ME-C type is considered to be less feasible. S50ME-B mark 9 is higher powered, with
an engine output increase of 12.6% per cylinder, compared to mark 7. Mark 9 also suits continuously evolving hull designs, due to efficient propellers with low optimum speed. The engine will adopt the design features of the smaller ME-B engines, and will be introduced with 117rev/min. All the new S50-B engines are available in five-
to nine- cylinder variants, comprising an output range of 2975kW to 16,020kW. Mark 9 will include an increased MEP and stroke-to-bore ratio, and a high mean piston speed to increase power concentration. The production cost has been reduced by operating a smaller camshaft than normal. An option available from January 2008 is to
install TCA turbochargers with variable nozzle rings technology, compensating for the absence of variable exhaust gas valve timing, in terms of part-load fuel consumption. Fuel economy and emissions can be managed
with the fuel-injection control, plus an Alpha lubricator comes as standard to ensure low cylinder lubricating-oil consumption.
Common rail engine launch MAN Diesel has also recently launched a
medium-speed common rail diesel engine, the 32/44 CR. Producing 560kW per cylinder, it is MAN’s first heavy fuel engine to be offered exclusively with common rail fuel injection. It is derived from
the type 32/40 heavy fuel engine, which has logged over 20,000 operat ing hours on a number of ships, following its introduction two years ago. The 32/44 CR
power unit produces a maximum output of 3360kW from six cylinders, as opposed to 3520kW from eight cylinders, and offers a smokeless exhaust under all engine load conditions. Common rail technology can reduce the need for overhauls, while low fuel consumption results in fewer NOx, soot, and CO2
emissions. One of the first vessels ME-B engine cross section. SHIP & BOAT INTERNATIONAL MAY/JUNE 2007
to have the 32/44 CR installed will be M/V Princess Benedikte from Scandlines, a 14,822gt double-ended ro-pax ferry.
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A cutaway of the MAN Diesel 32/44CR engine.
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