Iveco Marine Diesel Engines, Installation Handbook

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MARCH 2004 ENGINE/BOAT CHOICE FACTORS
2.25
MARINE ENGINES INSTALLATION
The type of boat and its purpose, represented by the load factor and the foreseeable operating time
together with the choice of the propeller make it possible to identify the performance required to
the engine.
As the power data which can be derived from the typical curves are the net ones resulting from the
flywheel and referred to particular environmental conditions, in the choice of the engine it is necessary
to foresee a sufficient power reserve to compensate for factors such as:
■
The environmental conditions (temperature, height, humidity)
■
The power absorbed by accessories such as pumps, compressors, winches, alternators actuated by
the engine, silencers, additional air filters and mechanical organs between the engine and the pro-
peller (inverters, reducers, thrust bearings, supports, axis line)
■
Fuel temperature
■
Insufficient maintenance and lack of regular setting-up
■
Preservation conditions and efficiency of hull and propeller
2.2 USE OF THE BOAT - ENGINE SETTING
The performance of IVECO marine engines is determined by specific settings for each use mission of
the engine/boat.
The engine setting is established for each type of engine after exhaustive duration tests carried out at
IVECO testing bodies and after practical use on the boats. As a result, the engine power and rotation
maximum rates admitted for an application are identified.The engine performance can be derived from
the typical curves of the engine which usually include five different types of use.
We remind you that the engines must be used for the purpose to which their setting makes reference;
the non observance of this prescription makes the warranty void.
Fast short-range yachts
Boat
Yachts and military boats with gliding hull and high-speed boats or semi-gliding hulls and displacing hulls
using the maximum power for short periods alternated with long periods where the speed is below
the maximum value. For example, yachts, high-speed boats for military or state bodies.
Engine
Use of the maximum power limited to 10% of the time, cruising speed with engine rpm < 90%
of the set rated rpm, use limit 300 hours/year. The definition of setting and use limits for military and
state bodies is based on the contractual specifications.
Power classification according to ISO 3046-7 (IOFN).
Long-range yachts/commercial boats
Boat
Light boats for recreational, commercial and military use with long-range gliding, semi-gliding and dis-
placing hulls and use of maximum power for short periods alternated with long periods where the
speed is below the maximum value. For example yachts, charters, boats for light commercial use and
long-range boats for military and state bodies.
Engine
Use of the maximum power limited to 10% of the time, cruising speed with engine rpm < 90%
of the set rated rpm, use limit 1000 hours/year.The definition of setting and use limits for military and
state bodies is based on the contractual specifications.
Power classification according to ISO 3046-7 (IOFN).
2.1 GENERAL INFORMATION