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Federal-Mogul, Mercedes-Benz develop piston technology for V6 diesel engine

ABR Staff Writer Published 02 September 2011

Federal-Mogul, a supplier of powertrain and safety technologies, in collaboration with Mercedes-Benz has developed a new piston technology for Daimler's latest V6 diesel engine.

The company said that the new piston technology will help to reduce fuel consumption and emissions.

The design gives Mercedes-Benz a piston that fully exploits the advances in thermal and mechanical durability made possible by the company's DuraBowl manufacturing process.

The use of DuraBowl technology allows piston crown geometries that help to burn fuel efficiently, improve combustion efficiency, reduce emissions and its increased durability also helps designers to reduce piston mass while improving performance.

Federal-Mogul president and CEO Jose Maria Alapont said the rising specific output of downsized diesel and gasoline engines place higher thermal and mechanical loads on many of the key components where the company has expertise.

"The DuraBowl piston process shows how we are delivering specialised process technologies that help our customers meet these challenges successfully and support sustainable global profitable growth," Alapont said.

The large-bowl combustion chamber in Daimler's OM642 V6 3.0-litre diesel features a piston crown with an enlarged bowl recess with steep sides and a sharp cutback below the rim, which helps reduce emissions to EU5/EU6-levels by lowering the compression ratio to 15.5:1 from 18:0 (EU4).

To strengthen the piston crown, the company's DuraBowl process uses a high-voltage, high-amperage form of Tungsten Inert Gas arc welding (TIG) to remelt the metal around the bowl rim into a durable microstructure.