Page 24: of Maritime Reporter Magazine (July 15, 1986)

Diesel Power Review (continued) chargers. This engine series, and the other commercial (non-naval) GMT diesels, are designed for operation on heavy fuel oil.

On extensive testbed trials 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 higher-powered, more economical

BL550 series covers a power range from 9,900 to 33,000 bhp for ship propulsion or electric power genera- tion.

By increasing the piston stroke from 590 to 630 mm, the per-cylin- der 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 sec- ond.

Following testbed results on a new 12-cylinder 420H engine, pro- duction has begun on this higher- rated version of the GMT A420H with a bore of 420 mm. Output per cylinder has been 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-lines with 6, 8, or 9 cylinders and V-form with 10, 12, 14, or 16 cylinders. Fitted with the

Brown Boveri VTR ME4 turbo- chargers of the latest design and higher efficiency, this engine series

Product literature and technical re- ports are available free of charge from the manufacturers included in this review. Just circle the appro- priate Reader Service number(s) on the postpaid card in the back of this issue. has a lower specific fuel consump- tion of about 128 grams per bhp- hour compared with the original

A420 engine.

Another major step for Grandi

Motori will be taken this year when production of the supercharged

A210SM naval engine begins. This engine is a further development of the naturally aspirated A210M en- gines installed in the Italian Navy's

Sauro Class submarines. Redesign and other development work has resulted in an even more compact engine with 8, 12, or 16 cylinders in

V-form, of low specific weight, and covering outputs of 2,575, 3,870, and 5,150 bhp at 1,500 rpm.

ISOTTA FRASCHINI

Circle 26 on Reader Service Card

Isotta Fraschini SpA, a company of the VM Group in Italy, designs and manufactures a broad range of diesel engines for various applica- tions. The ID 32 Series for marine propulsion offers a power range from 180 to 400 bhp at 2,700 to 3,000 rpm.

The ID 38 Series is rated from 180 to 400 bhp at 2,700-2,900 rpm for workboat propulsion, and 500 bhp at 3,000 rpm in military applica- tions. The ID 36 Series has a power range of from 300 to 1,320 bhp at 1,650-1,800 rpm for workboats, and up to 1,600 bhp at 1,900 rpm for mil- itary vessels.

The ID 36 engines are available in

V configuration with 6, 8, 12, and 16 cylinders; a 10-cylinder version is under development. All production engines in this series are available in amagnetic versions.

Isotta also manufactures, under license, the Paxman Diesel model

PV2000 engine, which has a power range from 1,000 to 4,500 bhp at 1,600 rpm.

KRUPP MaK

Circle 27 on Reader Service Card

The latest marine diesel offered by Krupp MaK Maschinenbau

GmhH of Kiel, West Germany, is the M 453 C series, a product of con- tinuous development dating back to 1962. Each succeeding generation has been improved in technical de- sign and fuel economy, with the M 453 C having a specific fuel con- sumption of 133 grams per bhp- hour under typical marine operating conditions.

The medium-speed, in-line M 453

C is available with 6, 8, 9, 12, or 16 cylinders. Bore is 320 mm and stroke is 420 mm. Output per cylin- der is 442.5/402 bhp at 600 rpm. The

M 453 C is capable of burning heavy fuel oil, and is suitable as a main propulsion engine in a single and multi-engine installations, with fixed or controllable-pitch propel- lers, and as an auxiliary engine.

The long stroke of the M 453 C means lower engine speed, reducing mechanical friction. It also permits favorable design of the combustion chamber despite a high combustion ratio. Thus there is ample height in the combustion chamber for the jet to diffuse unimpeded.

Special attention has been paid to the development of the cylinder head. This robust component of spheroidal graphite cast iron now incorporates an intermediate deck to make it highly rigid. The cylinder head can be removed with a pneu- matic impact tool within 20 min- utes.

Cylinder liners are supported in

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Vapor Corporation - Heat Exchange Products 6420 West Howard Street, Chicago. Illinois 60648 Telephone 312/631-9200 the engine housing immediately be- low the collar. The housing has been strengthened to insure that the in- creased forces can be absorbed safe- ly. Liners are hardened and preci- sion-honed to provide low levels of oil consumption.

MaK medium-speed engines have been using heavy fuel oils with vis- cosities of up to 700 cSt for more than 20 years, with all of this experi- ence embodied in the M 453 C. MaK has delivered some 2,200 diesel en- gines of the M 451, M 452, and M 453 series with a total output of about 4.7 million bhp. This includes some 1,000 engines of the M 453 range since 1972, and this series continues to figure prominently in

MaK's annual production.

M.A.N.-B&W DIESEL

Circle 28 on Reader Service Card

M.A.N.-B&W Diesel, as the world's largest designer of marine diesel engines, has successfully de- veloped engines with the highest thermal efficiency available, while at the same time maintaining a very high level of service reliability.

With the introduction of the MC low-speed series, M.A.N.-B&W has brought the fuel consumption down to 118 grams per brake horsepower- hour, which, compared with the 156 g/bhph 10 years ago, means a reduc- tion of about 25 percent. At the same time the corresponding revo- lutions of the direct-coupled propel- ler have been reduced from 114 rpm to 60 rpm, which has led to an increase in the propeller efficiency of 12-15 percent. These factors com- bined mean a total saving in the fuel oil consumption on propulsion en- gines alone of up to 40 percent.

The new four-stroke, heavy-fuel

L58/64 engine will be produced as in-line units with six, seven, eight, and nine cylinders, providing a pow- er range (mcr) from 9,900 to 14,850 bhp.

The L58/64 is a logical upgrading of M.A.N, medium-speed engines that have rendered excellent service in operation on heavy fuel for al- most 20 years. This early under- standing of heavy fuel-burning characteristics was further extended by the 40/45 engine type, which in the 1970s introduced a modern con- cept with high firing pressure, the basis for low fuel consumption.

During the development of the

L58/64 engine, particular emphasis was placed on the following: low fuel consumption; high reliability in un- restricted operation; simple and easy maintenance; and adaptability to varying operating and environ- mental conditions as well as fuel ignition qualities.

M.A.N.-B&W HOLEBY

Circle 29 on Reader Service Card

The 4-stroke diesel engines of

B&W design manufactured in Hole- by, Denmark, are used entirely for generator sets. The annual capacity of the factory is 170,000-200,000 bhp, of which the large majority is produced for marine installations.

The Holeby Diesel production is 24

Circle 174 on Reader Service Card Maritime Reporter/Engineering News