Contact Details

Federal-Mogul Friedberg GmbH

Bürgermeister-Schmidt-Str. 17
Burscheid
51399
GERMANY

Tel: 0049 217 469 1771
Fax: 0049 217 469 1336

Email:

URL:

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Federal Mogul

Federal-Mogul designs and manufactures nearly all known types of piston ring variations. In Europe, we have developed our own CAD system, called “EMSY” (Engineering Management System) for piston ring design, calculation and drawing with integrated design, variation and production management. Our North American counterpart tool to EMSY is PRISM (Piston Ring Interactive Spreadsheet Model). Our proprietary design tools enable us to produce fully customized piston rings for your specific application.

Both U.S. and European teams manage informational flow through the PTC-designed Windchill system. This allows an optimized synergy of drawing creation, design changes, test documentation and investigation reporting, while offering a secure means for the customer to access sensitive data and test results.


We manufacture our piston rings with different coatings or surface treatments to prevent:

  • Excessive wear on ring periphery and side faces
  • Scuffing on the surfaces of both ring and cylinder
  • Microwelding between ring side face and piston groove
  • Oil consumption and blowby
  • Excess friction

We manufacture all known coatings and treatments using the latest technology at the highest level of quality. This includes galvanic chromium coatings, molybdenum flame-sprayed coatings, metal and metal-ceramics plasma coatings, PVD (Physical-Vapor-Deposition) coatings and nitrocarburizing treatments.

Compression Rings

Federal-Mogul offers various types of compression rings — all designed to seal the combustion chamber from the crankcase (blowby) and transfer heat from the piston to the cylinder. These rings also assist in controlling engine oil consumption, which has a strong influence on exhaust gas emissions.

Scraper Rings

Most Federal-Mogul scraper rings have a step recessed into the bottom outer face, which assures extremely effective oil scraping and increases the unit pressure. Additionally, the step relief causes a positive twist that, without gas pressure, brings the periphery into bore contact with only the very edge of the step. The volume created by the step is beneficial in allowing large amounts of oil to be stored.

Oil-Control Rings

Federal-Mogul offers a wide variety of two-piece and three-piece oil-control rings to suit a vast range of customer needs. 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.