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MAN B&W 2.06
Specific Fuel Oil Consumption, ME versus MC engines
As previously mentioned the main feature of the
ME engine <strong>is</strong> that the fuel injection and the exhaust
valve timing are optim<strong>is</strong>ed automatically
over the entire power range, and with a minimum
speed down to around 5% of the L speed.
Comparing the specific fuel oil comsumption
(SFOC) of the ME and the MC engines, it can be
seen from the figure below that the great advantage
of the ME engine <strong>is</strong> a lower SFOC at part
loads.
It <strong>is</strong> also noted that the lowest SFOC for the ME
engine <strong>is</strong> at 70% of O, whereas it was at 80% of O
for the MC engine.
Fig. 2.06.01: Example of part load SFOC curves for ME and MC with fixed pitch propeller
MAN B&W ME/ME-C/ME-GI
SFOC
g/kWh
+3
+2
+1
0
-1
-2
-3
-4
MC
ME
MAN Diesel
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For the ME engine only the turbocharger matching
and the compression ratio (shims under the p<strong>is</strong>ton
rod) remain as variables to be determined by the
engine maker / MAN Diesel.
The calculation of the expected specific fuel oil
consumption (SFOC) can be carried out by means
of the following figures for fixed pitch propeller
and for controllable pitch propeller, constant
speed. Throughout the whole load area the SFOC
of the engine depends on where the matching
point (O) <strong>is</strong> chosen.
-5
50% 60% 70% 80% 90% 100% 110%
Engine power, % of matching point O
198 97 38�9.2
198 38 36-3.3