The Mc/Mc-C Tier Ii Engine; Concept Of The Mc/Mc-C Engine; Engine Design And Imo Regulation Compliance - Man B&W S50MC-C8-TII Project Manual

MAN B&W

The MC/MC-C Tier II Engine

Whether the freight rates rise or fall, an attractive
payback time for newbuildings starts with low in-
vestment cost. Once in operation, the ease and
flexibility in assigning engineers to operate the
engine plant are together with low consumption
rates of fuels, lubes, parts and service among the
important functional issues which contribute to
the cost benefit. The MAN B&W MC/MC-C engine
meets both requirements.
The world market-leading two-stroke MC/MC-C
engine programme from MAN Diesel has evolved
since the early 1980s to embrace bore sizes from
260 mm to 980 mm for propelling ocean-going
ships of all types and sizes. In fact, low-speed
two-stroke main engines of the MC/MC-C type
have become industry standard in a huge number
of ship types. Also land-based applications (pow-
er plants mainly) have found the MC/MC-C engine
types attractive.
The MC/MC-C engine features chain driven cam-
shaft, camshaft controlled fuel injection timing
and exhaust valve opening as well as a conven-
tional fuel oil pumps, all well-known and proven
technology familiar to marine engineers all over
the world.
To conclude, the MAN B&W MC/MC-C engine
combines classic virtues of commonly known,
well-proven technology continuously upgraded
and up-rated to suit the requirements to modern
prime movers. Consequently, our latest cutting
edge design and manufacturing features are built
into each component.

Concept of the MC/MC-C engine

The engine concept is based on a mechanical
camshaft system for activation of the fuel injec-
tion and the exhaust valves. The engine is pro-
vided with a pneumatic/electric manoeuvring sys-
tem and the engine speed is controlled by an
electronic/hydraulic type governor.
MAN B&W MC/MC-C-TII engines
Each cylinder is equipped with its own fuel in-
jection pump, which consists of a simple plung-
er activated by the fuel cam directly. The optimal
combination of NOx and SFOC (Specific Fuel Oil
Consumption) is achieved by means of the Vari-
able Injection Timing (VIT) incorporated in the fuel
pumps (applicable for MC/MC-C engines type 98-
50 only).
The cam controlled exhaust valve is opened hy-
draulically and closed by means of an air spring.
Lubrication is either by means of a uni-lube oil
system serving both crankshaft, chain drive, pis-
ton cooling and camshaft or a combination of a
main lubricating oil system and a separate cam-
shaft lube oil system.
Cylinder lubrication is accomplished by electroni-
cally controlled Alpha lubricators, securing a low
lube oil consumption, or timed mechanical lubri-
cators alternatively.
The starting valves are opened pneumatically by
control air from the starting air distributor(s) and
closed by a spring.
Engine design and IMO regulation compli-
ance
The MC-C engine is the shorter, more com-
pact version of the MC engine. It is well suited
wherever a small engine room is requested, for in-
stance in container vessels.
For MAN B&W MC/MC-C-TII designated engines,
the design and performance parameters have
been upgraded and optimised to comply with the
International Maritime Organisation (IMO) Tier II
emission regulations.
The potential derating and part load SFOC figures
for the Tier II engines have also been updated.
For engines built to comply with IMO Tier I emis-
sion regulations, please refer to the Marine Engine
IMO Tier I Project Guide.
MAN Diesel
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