Mercedes-Benz has unveiled a totally new generation of Mercedes-Benz medium-duty engines with the series designation OM 93x in Stuttgart-Unter­türk­heim today. Together with the equally new heavy-duty OM 470 engine, Daimler is expanding its “BlueEfficiency Power” engine portfolio into a comprehensive range complying with the impending Euro VI emissions standard. Initially presented in 2011, the OM 471 is already in service on long-haul operations in the new Mercedes-Benz Actros.

“The new engines set new benchmarks in their class. They have been designed in uncompromising manner for environmental friendliness, economy and performance,” noted Georg Weiberg, Head of Truck Product Engineering Daimler Trucks, at the presentation of the engines. For the first time ever in an engine series for commercial vehicles, all the engines comply with the future Euro VI emissions standard. Euro VI will be mandatory in the EU from 2013/14. “As such, Mercedes-Benz is once again assuming the pioneering role in environmental protection,” Weiberg added. He emphasized that this was particularly important for the OM 93x, as medium-duty engines are deployed primarily in trucks and buses which are used in conurbations, where reductions in emissions directly benefit the local population.

At the same time, the new medium-duty engines are extremely economical thanks to their long service lives, low consumption of fuel, AdBlue and engine oil and long maintenance intervals. Cutting-edge engine technology assures the OM 93x series of spontaneous acceleration and impressive power delivery. One of the technical highlights is the variable valve timing, which features for the first time in a diesel engine.

“We have invested around 500 million euros in development of the new Mercedes-Benz OM 934 and OM 936 engines and their production facilities at the Mannheim plant,” observes Stefan Buchner, Head of Global Powertrain, Procurement and Manufacturing Engineering Daimler Trucks. “This commitment has paid off: the new OM93x series is a milestone among medium-duty engines and suitable for a diverse range of applications – in trucks, buses and as an industrial engine.” The engines form part of a modular system with a high degree of shared components.

The medium-duty OM 934 and OM 936 engines, with four and six cylinders and a displacement of 5.1 and 7.7 litres respectively, cover a power range from 115 kW (156 hp) to 260 kW (354 hp). In the long term, the two engines will replace the engines of the 900 series launched in 1996, with a production volume to date of almost one million units.

The heavy-duty OM 470 engine with six cylinders and a displacement of 10.7 litres spans the power range from 240 kW (326 hp) to 315 kW (428 hp). It follows the OM 471 with a displacement of 12.8 litres which was presented last year.

The new engines are tailor-made for light- to heavy-duty distribution transport and for service in light- and medium-duty construction and long-haul transport. The OM 936 is also designed for deployment in urban and rural-service buses in vertical and rural-service buses in vertical and horizontal configuration.

Installation in other brands and models of Daimler Trucks on other continents is planned in due course. It is also planned to use the cutting-edge four- and six-cylinder engines in off-highway applications as industrial engines. Series production of the urban bus variants at the Mannheim engine plant will start shortly.

The Mannheim plant operates according to the “synchronous factory” principle. This means that the three production areas of foundry, machining and assembly function as an integrated system as part of a continuous production flow. Global supplier management is also coordinated in Mannheim.

Source: Daimler AG