Primarily applied to exhaust valves to facilitate temperature reduction, the hollow valves can also be used on the intake side to save weight. This allows the valve head to run between 80☌ and 150☌ cooler. Unlike a conventional valve with a solid stem, which conducts almost 75 percent of its heat away through the head and seat, Federal-Mogul Powertrain`s hollow stem technology reduces the heat flow through the valve head to around 50 percent of the total by transmitting a greater share through the stem and guide. "Our sodium-cooled, hollow stem valves allow the temperature of the valve heads to be reduced using a wide range of steel materials, and also enable a reduction in valvetrain mass that cuts friction." "As vehicle manufacturers continue to pursue reduced CO 2 emissions with more efficient engines that are often downsized and turbocharged, cylinder temperatures and pressures are increasing," said Guido Bayard, Director, Global Valvetrain Technology, Federal-Mogul Powertrain. Among the components produced by the company`s Global Valvetrain business are sodium-cooled valves with exceptionally small stem diameters that deliver both reduced weight and greater resistance to the high temperatures that can be a limiting factor in highly rated downsized engines. Federal-Mogul Powertrain, a division of Federal-Mogul Holdings Corporation ( FDML), will exhibit its newly acquired engine valve technology for the first time at the 2015 IAA Show in Frankfurt in September. Industry-leading performance from Global Valvetrain division on display at IAA 2015
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