Page 31: of Maritime Reporter Magazine (October 15, 1981)
current M.A.N.—B&W production program have been designed with a view toward a high firing pres- sure ratio. In continuous service, the engines with bores from 32 cm to 52 cm operate at firing pressures of up to 145 bar. By means of precision changes not involving extensive redesign, high firing pressures can be attained with mechanical stresses remain- ing within controllable limits.
The engine program of M.A.N. (Maschinenf abrik Augsburg-
Nurnberg AG) includes five four- stroke engines with bores from 200 to 520 mm, and five two- stroke engines with bores from 520 to 900 mm — three of which are long-stroke versions. The four-stroke engines cover an out- put range from 134 to 1,187 bhp per cylinder, and the two-stroke engines from 1,187 to 3,889 bhp per cylinder. The mean effective pressure of the four-stroke en- gines is 20 bar (25 bar with two- stage supercharging), and that of the two-stroke engines is 13 bar and 14.5 bar for the low- speed types and approximately 15 bar with the two-stage H engines. The maximum cylinder pressure of the medium-speed en- gines is up to 145 bar, and that of the two-stroke engines is 115 bar.
Today's engine production pro- gram at M.A.N, thus combines, on a high-power level, proven princi- ples with present and future de- mands. The most important de-
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SYSTEMS INC. 224 Park Avenue, R O. Box 352,
Florham Park, N.J. 07932 (USA)
Cable: BUTTWORTH NEW YORK
SYSTEMS (UK) LTD. 123 Beddington Lane
Croydon CR9 4NX. (ENGLAND)
Cable: MAROPEDOK CROYDON
Telex: 946524 velopment targets for the updated program were:
Ability to burn heavy fuel oils up to 3,500 seconds Redwood 1 in the case of four-stroke engines, and up to 6,000 sRl in the case of two-stroke engines; adherence to proven design concepts wherever expedient ; variation in turbo- charger arrangement and selec- tion of optimum speed; type of construction fully developed in terms of production, engineering, and maintenance; and high qual- ity standard.
By proven design principles
M.A.N, understands that for as many components of different en- gine types as possible, the same design solutions are used, per- mitting the transfer of computed and measured results from trial data and practical experience.
The constant demand from the shipowners and shipyards for a smaller engine developing below 1,000 kW (1,341 bhp) and the rising interest in smaller station- ary units for combined power/ heat generation prompted M.A.N, to develop the 20 27 engine. This engine is available as an in-line unit with four to nine cylinders, and as a V engine with 12 to 18 cylinders.
The 20 '27 engine is intended mainly for the following appli- cations: as a propulsion engine for smaller vessels; as an auxil- iary engine for power generation aboard ships; for stationary pow- er-generating plants; and for plants combining power genera- tion with waste heat recovery.
The 20 27 engine is offered in diesel, spark-ignited gas, and dual- fuel versions. The cylinder rating of the diesel engine is 100 kW (134 bhp) at 1,000 rpm according to the ISO definition. Its mean effective pressure and mean pis- ton speed are 14.15 bar and 9 me- ters per second, respectively.
For additional information,
Write 63 on Reader Service Card
The latest addition to the die- sel line of West German engine manufacturer Motoren- und Tur- binen-Union is a new 16-cylinder engine in the 396 Series, extend- ing the power range of the Series to 2,400 bhp. MTU's 02 version of the 396 Series has found wide acceptance throughout the world, with some 1,600 engines in V 6,
V 8, and V 12 models in service up to mid-1980.
Now, based on long operating experience with the 02 version,
MTU has introduced the 03 ver- sion of the 396 Series, providing a further increase in perform- ance. Major technical modifica- tions contributing to the in- creased performance are an in- creased mean effective pressure with a concurrent reduction of (continued on page 36)
October 15, 1981 Write 3432 on Reader Service Card 35