Page 19: of Maritime Reporter Magazine (May 1986)

outputs from 3,000 to 8,000 bhp at 720-750 rpm, but with special fea- tures to insure improved perform- ance at part loads. This type will use the latest bore-cooling technique for combustion chamber components, and utilize to best advantage the greater efficiency of the latest

Brown Boveri exhaust-gas turbo- chargers. This engine, and the other commercial (non-naval) diesels, are designed for operation on heavy fuel.

Also on extended testbed trials at present is a longer-stroke version of the well-established B550 engine, with a bore of 550 mm the largest of the GMT medium-speed engine range. This new higher-powered, more economic BL550 unit covers a power range from 9,900 to 33,000 bhp for ship propulsion or electric power generation.

With the stroke/bore ratio raised from 1:07 to 1:14 by increasing the piston stroke from 590 to 630 mm, the cylinder output of the BL550 has been increased to 1,650 bhp at 450 rpm with only a modest rise in mean effective pressure from 20.6 to 21.6 bar, and of the mean piston speed from 8.85 to 9.45 meters per second. Modifications to combus- tion chamber and fuel injection de- signs, together with adoption of the latest higher-efficiency turbocharg- ers, have already reduced the specif- ic fuel consumption to 178 gr/kW on the standard B550 engine, but it is predicted that the new BL550 will have an even better figure of 168 gr/ kW as a result of higher maximum combustion pressures.

Two of these new type 6-cylinder engines have already been ordered for a ferry for the Italian State Rail- ways, and two others, but with 16 cylinders and as dual-fuel (gas and diesel oil) units for a total-energy municipal power station in Turin.

This longer-stroke BL550 will be available with 6, 8, and 9 cylinders in-line and with from 12 to 20 cylin- ders in V-form.

Following testbed results on a new 12-cylinder 420H engine, pro- duction is about to commence on this new higher-rated version of the

GMT A420H (420-mm bore series).

Output per cylinder is increased from 700 bhp at 500 rpm to 800 bhp at 600 rpm. This series now covers an output range from 4,800 to 12,800 bhp, from in-lins with 6, 8, and 9 cylinders, and V-form with 10, 12, 14, and 16 cylinders.

With the Brown Boveri VTR

ME4 turbochargers of the latest de- sign and higher efficiency, this class of engine has a lower specific fuel consumption (about 128 grams per bhp-hour) compared with the origi- nal A420 engine, a shorter piston stroke of 480 mm, and output per cylinder increased from 700 to 800 bhp at a higher 600 rpm.

As a further development, Grandi

Motori is also concentrating efforts on its 230-mm bore, high-speed en- gine, a highly versatile unit capable of burning heavy fuel oil and there- fore suitable for uni-fuel ships. This engine is also available as special M versions for naval ship propulsion and auxiliary applications, includ- ing a non-magnetic unit for mine- hunting naval vessels.

May, 1986

The engine designated B230 is available in two versions, standard and long-stroke, both radically up- dated as regards cooling arrange- ments and pressure-charging, and otherwise meeting the higher out- puts available from 720 to 1,200 rpm for marine propulsion of commer- cial vessels, for generating sets, off- shore duties, and for naval vessels.

Another major step for Grandi

Motori will be taken this year when production is commenced of the su- percharged A210SM naval engine, a marked development of the natural- ly aspirated A210M units installed in the Italian Navy's recent Sauro

Class submarines. The latest rede- sign and other development work has resulted in an even more com- pact engine with 8, 12, and 16 cylin- ders in V-form, of low specific weight, and covering outputs of 785, 1,180, and 1,570 kw at 1,500 rpm.

The new A210SM for submarine propulsion has a cylinder bore of 210 mm, piston stroke of 230 mm, and is pressure-charged with inter- cooling to an MEP of 9.87 bar.

For further information and free literature on GMT engines,

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