Westerfield, Z., Liu, Y., Kim, D., and Tian, T., "A Study of the Friction of Oil Control Rings Using the Floating Liner Engine," SAE Int. J. Engines 9(3):1807-1824, 2016, doi:10.4271/2016-01-1048.
The oil control ring (OCR) controls the supply of lubricating oil to the top two rings of the piston ring pack and has a significant contribution to friction of the system. This study investigates the two most prevalent types of OCR in the automotive market: the twin land oil control ring (TLOCR) and three piece oil control ring (TPOCR). First, the basis for TLOCR friction on varying liner roughness is established. Then the effect of changing the land width and spring tension on different liner surfaces for the TLOCR is investigated, and distinct trends are identified. A comparison is then done between the TLOCR and TPOCR on different liner surfaces. Results showed the TPOCR displayed different patterns of friction compared the TLOCR in certain cases.