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The burning mark test is an engine test procedure to determine the scuff resistance of the running surface of piston rings. It forms the basis to compare and rate surface treatments of ring base materials and ring coatings regarding their potential to stand high thermal loads. The tests are carried out on a High Speed Diesel engine as well as on a turbocharged Gasoline engine. The paper shows the specific details of the definition of the burning mark test, demonstrates the most important test results and gives finally a summarized rating of the burning mark resistance of the materials investigated.

A new forged steel piston has been designed that shows advantages for use in highly loaded diesel engines in two possible applications: 1 The reliability of a forged steel piston for peak cylinder pressures up to c.18 MPa with a weight reduced to near that of an aluminum piston, if the pin is taken into consideration. 2 A piston with higher loadability than an articulated piston with advantages in weight at a competitive price. Design criteria are presented as well as results from a three dimensional Finite Element Analysis. The production process is described. Results from engine development tests are shown, applying this new piston in a heavy-duty truck engine.