Wear a piston skirt for less wear
NUREMBERG — Federal- Mogul Powertrain, a division of Federal- Mogul Holdings Corporation, has introduced piston skirt coatings that deliver less friction in both petrol and diesel turbo- charged engines.
Building on the proven performance of previous EcoTough coatings, the new formulations further reduce engine friction, wear and noise, while dealing with the challenging loads and temperatures that exist in the latest downsized, turbocharged engines. “Reducing frictional losses by applying materials expertise is a critical element of Federal- Mogul Powertrain’s work with engine manufacturers,” said Gian Maria Olivetti, chief technology officer, Federal- Mogul Powertrain.
“Our new EcoTough piston skirt coatings have the increased durability necessary to perform for the life of the piston under the greater thermal and mechanical loads created by the latest generation of highly efficient engines.”
He said petrol and diesel engines require alternative solutions because of important differences in their relative combustion loads, piston geometry and the lubricity of their respective fuels. Federal- Mogul Powertrain has accommodated these differences by formulating specific coatings, each optimised for either petrol or diesel application.
EcoTough- New Generation coating is a metal oxide- reinforced resin with additional embedded solid lubricant particles.
The coating, which is applied in a thickness of 15 microns, reduces skirt wear in gasoline engines by up to 40% compared to the market standard and offers significantly improved fatigue strength under extremely harsh conditions.
It also delivers piston friction reduction gains of up to 15% compared to standard coatings, directly improving the efficiency of the base engine. The new coatings are currently completing validation programmes with vehicle manufacturers.
EcoTough- D has been developed for aluminium and steel diesel pistons, in passenger cars and commercial vehicles.
Taking advantage of the greater structural stiffness of diesel pistons and the superior lubricity of diesel fuel, Federal- Mogul Powertrain was able to specify a different formulation and deliver greater improvement in friction levels. A polymerbased coating reinforced with short carbon fibres and containing graphite embedded as a solid lubricant, EcoTough- D reduces piston friction by as much as 35% compared to conventional coatings. Wear resistance is improved by up to 30%. “The piston skirt and piston pin alone account for around 17% of the frictional losses,” said Dr Frank T. H. Dörnenburg of Federal- Mogul.
A passenger car steel piston with the new Federal- Mogul Powertrain EcoTough- D skirt coating for diesel applications.