This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence of Crankcase Lubricant Viscosity on Fuel Consumption in a Medium-Speed Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
The influence of crankcase lubricant viscosity on brake specific fuel consumption (bsfc) has been evaluated in two medium-speed automotive diesel engines. An experimental procedure was established using steady-state operating conditions chosen to increase sensitivity of fuel consumption to changes in lubricant viscosity. The experimental procedure was used to evaluate Newtonian and non-Newtonian lubricants.
Results show that, as a group, 15W-40 multigrades are slightly better in fuel economy than a SAE 30 single grade. This difference is attributed to temporary viscosity loss with the multigrades. Use of high shear stress viscosity data brings fuel consumption data with non-Newtonian lubricants into line with that of Newtonian lubricants with the same viscosity and accounts for the difference in fuel consumption observed between two multigrades blended with different molecular weight polymers of the same molecular type.
A well known friction reducer shows no effect on bsfc. This confirms the predominance of viscosity in determining fuel economy in this engine.
Recommended Content
Authors
Topic
Citation
Wall, J., "Influence of Crankcase Lubricant Viscosity on Fuel Consumption in a Medium-Speed Diesel Engine," SAE Technical Paper 821148, 1982, https://doi.org/10.4271/821148.Also In
In Pursuit of Higher Fuel Economy--Engineering Know-How in Engine Design, Part 30
Number: SP-0530; Published: 1982-09-01
Number: SP-0530; Published: 1982-09-01
References
- McGeehan, J. A. “A Literature Review of the Effects of Piston and Ring Friction and Lubricating Oil Viscosity on Fuel Economy.” SAE Paper 780673
- Cameron A. “The Principles of Lubrication.” New York, New York Wiley and Sons, Inc. 1966
- Obert E. F. “Internal Combustion Engines and Air Pollution.” New York, New York Intext Educational Publishers 1973
- Stambaugh R. L. Kopko, R. J. “Behavior of Non-Newtonian Lubricants in High Shear Rate Applications.” SAE Paper 730487
- Rosenberg, R. C. “A Method for Determining the Influence of Multigrade Oils on Journal Bearing Performance.” SAE Paper 730483
- McMillan M. L. Murphy. C. K. “Temporary Viscosity Loss and Its Relationship to Journal Bearing Performance.” SAE Paper 780374
- Bell J. C. Voisey, M. A. “Some Relationships Between the Viscometric Properties of Motor Oils and Performance in European Engines.” SAE Paper 770378
- Dancy, J. H. Marshall, H. T. Oliver, C. R. “Determining Frictional Characteristics of Engine Oils by Engine Friction and Viscosity Measurements.” SAE Paper 800364
- Lane, G. Roberts, D. C. Tims, J. M. “Measurement of the Viscosity of Multigrade Oils in a Running Engine.” SAE Paper 770379
- “Engine Friction Reduction for Improved Fuel Economy.” SAE Paper 820085