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Mercedes-Benz unveils new OM 93x medium-duty engine family

13 March 2012

At its engine plant in Stuttgart Untertürkheim, Daimler unveiled a new generation of Mercedes-Benz medium-duty engines with a series designation OM 93x. All engines in the OM 93x series comply with Euro VI emission standards ahead of the regulatory deadlines (2013/14).

Daimler also introduced a new heavy-duty OM 470 engine, expanding its Euro VI “BlueEfficiency Power” engine portfolio. Initially presented in 2011, the OM 471 has been already in service on long-haul operations in the new Mercedes-Benz Actros.

Daimler developed the OM 93x engines to be “extremely economical thanks to their long service lives, low consumption of fuel, AdBlue and engine oil and long maintenance intervals”. One of the technical highlights in the new medium-duty engines is “variable valve timing, which features for the first time in a diesel engine”, says Daimler in their announcement. While this statement sounds ill informed—various variable valve actuation and timing technologies have been used in diesel engines by a number of manufacturers—it may be a reference to a specific variable valve timing technology that has not been used in diesels before.

The medium-duty OM 934 and OM 936 engines, with 4 and 6 cylinders and a displacement of 5.1 and 7.7 L 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 OM 93x series is suitable for a range of truck and bus applications. Daimler also plans to use the 4 and 6 cylinder engines in off-highway applications as industrial engines. The engines form part of a modular system with a high degree of shared components.

The heavy-duty OM 470 engine with 6 cylinders and a displacement of 10.7 L 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 L which was presented last year.

Daimler invested 500 million euros in the development of the new OM 934 and OM 936 engines and their production facilities at the Mannheim plant. The Mannheim plant operates according to the “synchronous factory” principle—the three production areas including 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