Federal-Mogul Powertrain two-piece oil-control rings are available in a variety of design variations. They include cast iron or nitrided profile steel bodies; standard, beveled or tapered ring lands; high-wear-resistance chrome, CKS or GDC coatings; and slotted or drilled drainage systems.
Two-piece oil-control rings are used in diesel and some automotive gasoline applications. The design of a two-piece oil-control ring consists of a cast iron or profiled steel ring body and a coil spring. The spring is a cylindrical coil spring made from heat-set resistant spring steel, and it acts uniformly around the entire ring circumference.
For most gasoline applications, Federal-Mogul utilizes three-piece oil-control rings. The design of three-piece oil-control rings consists of two thin steel rings (rails) and an expander-spacer, which holds the rails at the required relative axial distance while simultaneously pressing them against the cylinder wall.
For three-piece oil rings with an expander-spacer design, three fundamental styles have become established on the world market: VF System, MF System and SS50 System.
Oil-control rings are used in light-vehicle gasoline engines (two- or three-piece), light-vehicle diesel engines (two-piece), and truck diesel engines (two-piece). The main function of the rings in the bottom piston groove is to scrape oil from the cylinder wall, meaning oil-control rings play a major part in regulating an engine’s oil consumption.
Federal-Mogul Powertrain commonly produces five different types of two-piece oil-control ring bodies. Variations on ring land geometry and running face coating give many options for oil consumption and wear performance.
Three fundamental expander-spacer styles have been established for oil-control rings on the world market. When made from a nitridable steel, nitriding can provide effective protection against secondary wear.
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