New Marine Piston Ring Technology from Federal-Mogul set to Reduce Operating Costs and Carbon Emissions
Long term sea trials show up to 20 percent reduction in oil consumption and extended liner life on typical two-stroke diesel when fitted with new eWAVE® piston rings
Burscheid, Germany, 24th November 2015… Federal-Mogul Powertrain, a division of Federal-Mogul Holdings Corporation (NASDAQ: FDML), has developed a new piston ring for two-stroke diesel engines that reduces oil consumption and marine pollution by allowing the quantity of lubricant used to be greatly reduced. The patented surface topography of the new eWAVE® rings has been designed to distribute oil more evenly around the cylinder bores, enabling less oil to provide greater protection.
“eWAVE is the first ring that disperses oil around the bore in a homogeneous layer, protecting against local oil film breakdown, improving the sealing of combustion gases, reducing wear and ensuring more uniform liner temperatures,” explained Richard Mittler, Federal-Mogul’s Senior Expert Manager, Analysis and Product Development, Technology, Rings & Liners. “This means the amount of oil injected into the cylinder can be greatly reduced and, because two-stroke engines expel their lubricant in the exhaust, less oil means lower carbon emissions as well as reduced operating costs.”
Conventional two-stroke piston rings are predominantly designed using principles very similar to those used in four-stroke engines, in which there is a flow of oil from the crank case around the entire circumference of the ring. However, in two-stroke engines the lube oil is sprayed against the cylinder liner in proportion to the engine load. This feed oil is not uniformly distributed on the cylinder wall.
To ensure a safe minimum coverage of all areas of the liner, surplus oil is injected in order to compensate for the uneven distribution. Because there is no mechanism to distribute the oil circumferentially around the bore much of the surplus is pushed downwards in the direction of the ports, meaning that approximately 30 to 40 percent of the oil supplied passes through to the exhaust without ever performing a useful function.
The geometry of the eWAVE piston ring creates a circumferential pressure difference that generates controlled oil flow around the bore as the piston reciprocates, improving the uniformity of the oil film. It achieves this by varying, around the circumference, the point about which the ring pivots in its groove as the piston reverses direction. Tests have shown that the eWAVE ring distributes oil over an area circa 10 times the size of that achieved by conventional ring profiles, which generate less than one percent of their oil flow in a circumferential direction.
“Long term trials since 2013 in a number of vessels with different oil injection technologies have confirmed the economic and environmental advantages of eWAVE rings,” said Mittler. “In over 8000 hours of testing, we have seen improved wear resistance while reducing oil consumption by up to 20 percent, helping to reduce operating costs while improving the marine environment.”
The detail of the eWAVE design can be optimised to suit individual types and arrangements of feed nozzle and different engine strokes and operating speeds.
Federal-Mogul Holdings Corporation (NASDAQ: FDML) is a leading global supplier of products and services to the world’s manufacturers and servicers of vehicles and equipment in the automotive, light, medium and heavy-duty commercial, marine, rail, aerospace, power generation and industrial markets. The company’s products and services enable improved fuel economy, reduced emissions and enhanced vehicle safety.
Federal-Mogul operates two independent business divisions, each with a chief executive officer reporting to Federal-Mogul's Board of Directors.
Federal-Mogul Powertrain designs and manufactures original equipment powertrain components and systems protection products for automotive, heavy-duty, industrial and transport applications.
Federal-Mogul Motorparts sells and distributes a broad portfolio of products through more than 20 of the world’s most recognized brands in the global vehicle aftermarket, while also serving original equipment vehicle manufacturers with products including braking, chassis, wipers and other vehicle components. The company’s aftermarket brands include ANCO® wiper blades; Champion® spark plugs, wipers and filters; AE®, Fel-Pro®, FP Diesel®, Goetze®, Glyco®, Nüral®, Payen® and Sealed Power® engine products; MOOG® steering and suspension parts; and Ferodo®, Jurid® and Wagner® brake products.
Federal-Mogul was founded in Detroit in 1899 and maintains its worldwide headquarters in Southfield, Michigan. The company employs nearly 50,000 people in 34 countries. For more information, please visit www.federalmogul.com.
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Federal-Mogul Corporate Communications EMEA
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