... as on date but can be taken up as a future work with necessary modifications. It does not take into consideration the effect of elasto-hydrodynamic lubrication. Practical implications – It can be used to measure OFT between piston ring and liner in unfired engines and reciprocating compressors also...

... of the piston ring, like ring stiffness, are also not altered. Effect of variation in bore on the movement of piston ring can be studied with the proposed technique. Design/methodology/approach The gap Hmin between the cylinder liner and the piston ring is formed due to the hydrodynamic pressure generated...