PISTON RINGS FOR 2-4 STROKE ENGINES
We provide piston rings for two and four stroke from Federal-Mogul, specialized in developing, designing and manufacturing piston ring for the main engines. The product range of compression and oil rings starts at a diameter of 145 millimeters and covers ring solutions ranging up to 1,080 millimeters.
All material specifications produced by Federal-Mogul are developed in close co-operation with the leading engine manufacturers. The casting process must be controlled in order to ensure high material quality with good repeatability. Chemical composition and temperatures are carefully monitored throughout the casting process. The casting process govern the size, shape and distribution of the graphite, parameters which are of vital importance to strenght and heat conductivity of the piston ring.
PISTON RING COATINGS
In order to further increase the performance of the ring, various types of coatings are applied. Two main types of coatings can be distinguished; Running-in coatings and wear resistant coating. Running-in coatings are used to shorten or, for some applications, even eliminate the need for running-in. The wear resistant coatings are used to increase TBO or to cope with extreme operational conditions.
All piston rings are oval turned to create the tension in the ring. Federal Mogul infact has developed the OPCORE (Optimised ring end correction) technology in order to minimise the running-in wear and to ensure optimum geometry at the ring opening. The geometry, in terms of joint type, is of vital importance for the majority of the modern engine types, especially those engines equipped with gas tight top rings. For all types of rings the closed gap must allow for some thermal expansion, at the same time the gap has to be kept at minimum in order to reduce the leakage area.
SPECIAL RINGS AND TECHNICAL SERVICE
We can offer also a tailor made ring for your special requirements. The experienced technical staff assist you in discussions regarding trouble shooting and optional technical solutions.
