Effect of Cylinder Bore Out-of-Roundness on Piston Ring Rotation and Engine Oil Consumption 930796
Excessive cylinder bore out-of-roundness (OOR) can adversely affect the sealing functionality and durability of the piston-ring pack in an engine. This work reports the effects of changes in cylinder bore OOR on: (i) the rotation of the top and second compression rings, and (ii) oil consumption in an open-deck 4.5-L V-8 engine. A method was devised for altering the level of OOR in one cylinder of the engine without engine disassembly. Radiometric techniques were then applied to measure both piston ring rotation and oil consumption of that cylinder at three different levels of bore distortion. Results of these measurements are of value in determining the range of acceptability of production specifications for cylinder bore OOR.
Citation: Schneider, E., Blossfeld, D., Lechman, D., Hill, R. et al., "Effect of Cylinder Bore Out-of-Roundness on Piston Ring Rotation and Engine Oil Consumption," SAE Technical Paper 930796, 1993, https://doi.org/10.4271/930796. Download Citation
Eric W. Schneider, Daniel H. Blossfeld, Donald C. Lechman, Robert F. Hill, Richard F. Reising, John E. Brevick
General Motors Research
International Congress & Exposition
Tribology of Engines and Engine Oils-SP-0959, SAE 1993 Transactions: Journal of Engines-V102-3