Deutz MWM Introduces New Big-Engine Series

With the development of a new diesel engine series, Motoren-Werke Mannheim AG will systematically follow up, as announced last year, the concept of economical high-performance engines.

Based on the successful series 628, of which over 1,500 units have been sold since its market launch more than 10 years ago, the 632 series has been conceived with a cylinder output of 265 kw for continuous operation at a rated speed of 900 and 1,000 rpm and a maximum output of 350 kw at 1,200 rpm.

Trial runs of this new series have been started in Mannheim with an eight-cylinder in-line model. A preproduction series featuring in-line engines will be manufactured mid- 1992. The V-models are likely to be launched on the market one year later. The engine series will cover in-line versions with six, eight and nine cylinders and V-versions with 12,16 and 18 cylinders. Their power spectrum will thus range from 1,590 to 6,300 kw.

Dr. Hubert Hitziger, board member responsible for research and development, reported about the technical data of the new series: Similar to the 628 series, the new engines will have a bore of 240 mm, but their stroke of 320 mm will be considerably larger. The firing pressure will be 180 bar and the mean effective pressure 24 bar. For the production model, the expected power-to-weight ratio will be 4.0 kg/ kw with the in-line engines and 3.5 kg/kw with the V-engines. These are absolute top values for engines of this type and power class, which also underline the exemplary features of this new series.

Of course, it has also been the aim of the R&D activities to build more economical and environmentfriendly engines. The distinctly higher working pressures as compared to current engine series are an important contribution toward this goal. On the other hand, the piston speed is as low as 12.8 m/s even at the maximum speed of 1,200 rpm.

In accordance with the Deutz MWM philosophy, the new engines feature a very compact configuration; this means that their specific installation space requirement is relatively low. Their low weight has been achieved with a high inherent stability instead of high tensile materials. The crankcase, which has been optimized by way of calculation and experiments, represents an important aspect of that stability.

Its casting is simple and its torsional and bending stiffness is excellent. This was mainly realized by systematic provision of throughgoing cross sections, their arrangement relative to the crankshaft position as well as sturdy transverse fastening of the main bearing blocks.

The above specific data result in a low fuel consumption. Ease of maintenance is ensured for the new engines by the combination of parts in assembly groups and minimization of special tool requirement.

The new 632 series emphasizes an initial development impact after the medium- and big-engine activities of Deutz and MWM have been joined at Motoren-Werke Mannheim AG. The concentration of engineering and manufacturing of all watercooled engines in Mannheim and the resulting relocations from Munich, Cologne and Voerde to Mannheim, as well as the adaptation to market needs have brought about a company consolidation, the prerequisite for further developments of other engine series as well.

For free literature on the new bigengine series from Deutz MWM, Circle 43 on Reader Service Card

Other stories from May 1991 issue


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