This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measuring the Effect of Oil Viscosity on Oil Film Thickness in Engine Journal Bearings
Annotation ability available
Sector:
Language:
English
Abstract
The minimum oil-film thickness in the front main bearing of a 3.8 L, V-6 engine was measured at 3 000 r/min, and 140 N·m using an electrical resistance technique. For a series of seven Newtonian, single-grade oils, film thickness correlated with oil viscosity measured either in a kinematic or in a high-shear-rate viscometer. For a series of fifteen polymer-containing, non-Newtonian, multigrade oils, however, no single measure of viscosity adequately correlated with film thickness for all of the oils. By eliminating four multigrade oils from the combined single and multigrade data sets, it was possible to correlate film thickness to the viscosity (of the remaining multigrade and Newtonian oils) measured at 150°C and 5 × 105 s−1, conditions which are believed to be representative of temperatures and shear rates in bearing oil films. Possible explanations for the lack of correlation with the entire set of twenty-two oils are discussed.
Recommended Content
Authors
Topic
Citation
Spearot, J., Murphy, C., and Rosenberg, R., "Measuring the Effect of Oil Viscosity on Oil Film Thickness in Engine Journal Bearings," SAE Technical Paper 831689, 1983, https://doi.org/10.4271/831689.Also In
References
- McMillan, M. L. “Engine Oil Viscosity Classifications - Past, Present, and Future,” presented to the SAE Fuels and Lubricants Technical Committee Open Forum Detroit, Michigan February 1976
- Metzner, A. B. J. Lubr. Tech. 90F 531 1968
- Metzner, A. B. Rheol. Acta. 10 434 1971
- Leider, P. J. Bird, R. B. Ind. Eng. Chem. Fund. 13 336 1974
- Leider, P. J. Bird, R. B. Ind. Eng. Chem. Fund. 13 342 1974
- McMillan, M. L. Stambaugh, R. L. “The Development of a Viscosity Classification System Based on Engine Performance - A Review of SAE and ASTM Activities,” presented to the CEC International Symposium on the Performance Evaluation of Automotive Fuels and Lubricants Rome, Italy June 3-5 1981
- Rosenberg, R. C. “Influence of Polymer Additives on Journal Bearing Performance,” SAE Transactions 84 1975
- Goodwin, M. C. Haviland, M. L. “Fuel Economy Improvements in EPA and Road Tests with Engine Oil and Rear Axle Lubricant Viscosity Reduction,” SAE Paper No. 780596
- Rhodes, R. B. Henderson, B. M. “Effects of Engine Oil Viscosity and Composition on Bearing Wear,” SAE Paper No. 811224
- Lonstrup, T. F. Smith, M. F., Jr. “Engine Oil and Bearing Wear,” SAE Paper No. 810330
- Chamberlin, W. B. Saunders, J. D. “Screening Tests Used for Developing Fuel-Efficient Engine Oils,” Lubr. Engr. 36 69 80 1980
- Schneider, E. W. Rosenberg, R. C. “The Effect of Fuel Saving Engine Oils on Journal Bearing Load Capacity - A Radiometric Evaluation,” SAE Paper No. 821205
- Rosenberg, R. C. “A Method for Determining the Influence of Multi-Graded Oils on Journal Bearing Performance,” SAE Transactions 82 1973
- McMillan, M. L. Murphy, C. K. “Temporary Viscosity Loss and Its Relationship to Journal Bearing Performance,” SAE Paper No. 780374
- Filowitz, M. S. King, W. H., Jr. Appeldoorn, J. K. “Oil-Film Thickness in a Bearing of a Fired Engine,” SAE Paper No. 820511
- Bassoli, C. Cornetti, G. Bilei, M. “A System for Assessing the General Conditions of Lubricating Crankshafts,” RIVISTA ATA January 1978
- Cole, J. A. Hughes, C. J. “Oil Film Extent in Complete Journal Bearings,” Proc. Inst. of Mech. Engrs. 170 1956 499
- Craig, R. C. King, W. H., Jr. Appeldoorn, J. K. “Oil Film Thickness in Engine Bearings - The Bearing as a Capacitor,” SAE Paper No. 821250
- McMillan, M. L. Rosenberg, R. C. Murphy, C. K. “Viscosity Effects on Engine Wear Under High-Temperature, High-Speed Conditions,” SAE Paper No. 780982
- Letter from R. B. Rhodes, Chairman, to Members of ASTM Panel RDD VII-B HTR/RV November 11 1982
- Badiali, F. L. Cassiani Ingoni, A. A. Pusateri, G. “Friction Power Loss of Mineral and Synthetic Lubricants in a Running Engine,” SAE Paper No. 780376
- Kotani, T. Yamada, S. Okumura, K. Kobayashi, Y. “A Study of Antiseizure Properties of Motor Oils in Crankshaft Bearings,” SAE Paper No. 821197
- Wochnowski, H. “Wear-Inhibition by Adsorption of Polymeric Solution,” SAE Paper No. 830306
- Cameron, A. The Principles of Lubrication John Wiley & Sons Inc. New York, New York 277 306