Characterization of the Oil Film Behaviour Between the Liner and Piston of a Heavy-Duty Diesel Engine

The effects of surface texture in reciprocating contacts – An experimental study

“…The most significant limitation is the use of a single ring, whereas pistons in IC engines commonly have three and in some cases more rings. Moreover, the piston skirt comes in direct contact with the liner in the real scenario [25]. In addition to this, the stroke length used in this study is 26.8 mm, which is shorter than in a typical engine, however this is unlikely to affect the results obtained.…”

The Measurement of Liner - Piston Skirt Oil Film Thickness by an Ultrasonic Means

“…However, it is necessary to ascertain the validity of these predictions through measurement of film thickness [3,4]. This has proven to be difficult, owing to the inaccessible nature of the contact, as well as the inhospitable environment, particularly under fired conditions, especially at high speeds.…”

In-situ piston measurements

“…A range of experiments was carried out, varying the engine speed and load. Results from these experiments have been reported fully elsewhere [26,27]. However, it is worth reporting results on the variation in top-ring OFT with lubricant viscosity grade, which were not included in the previous publications.…”

“…A number of groups have carried out OFT measurements in a piston ring pack, some using electrical techniques [17][18][19][20][21], while others have used laser-induced fluorescence (LIF) techniques [22][23][24][25][26][27]. Our initial experiments used a window machined into the cylinder liner.…”