Iveco Marine Diesel Engines, Installation Handbook

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MARCH 2004 INTRODUCTION
1.13
MARINE ENGINES INSTALLATION
In addition, IVECO provides the customers with the technical and commercial documentation concern-
ing IVECO engines including the reference to the rules required for the correct choice of the engine.
Figure 4 illustrates the power curves of an IVECO engine.
Engine total efficiency
The engine total efficiency is defined as the relationship between the flywheel work and that corre-
sponding to the quantity of the fuel heat energy used to obtain that work. All the technical factors con-
tribute to the engine efficiency, from the design to the setting, the maintenance to the fuel quality.
The engine efficiency, index of the efficiency of transformation of the fuel energy into mechanical ener-
gy, is inversely proportional to the fuel specific consumption: an higher efficiency means a lower fuel
consumption required to obtain the power yield.The overall efficiency of a Diesel engine is around 0.4
with a clear loss of 60%.
Fuel consumption
The mechanical energy supplied by the engine is obtained by means of the fuel introduced in the engine
itself.There are two definitions for the consumption:
■
specific consumption
■
hourly consumption.
Figure 4
1600 1800 2000 2200 2400 2600 2800 3000 g/min
180
170
160
245
230
215
170
160
150
140
130
120
110
100
90
220
200
180
160
140
120
600
575
550
525
500
60
55
50
Kgm
g/CVh
To
rque Nm
BSFC g/KWh
CV KW
Torque
Power
BSFC