This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigations to Characterize the Low-Temperature-Fluidity of Polymer-Containing Engine Oils
Annotation ability available
Sector:
Language:
English
Abstract
Up to the present, the “W” portion of multigrade engine oils were classified only with regard to their low temperature startability by viscosity measurements at -18 C in the Cold Cranking Simulator. Because of the low shear rates encountered at the suction side of the oil pumps, the low temperature pumpability of the oils in the engine were not being considered.
The investigations which were promoted by the DGMK were conducted to correlate the low-temperature pumpability of multigrade oils in a full-scale engine with suitable viscosity measurements and with results of tests in laboratory pumping rigs. Comparative measurements of viscosities were obtained with different viscometers.
A critical shear rate of G = 50 s-1 was found for the borderline pumping conditions of the test engine.
Good correlations were obtained between viscosity data of a rotational viscometer and engine pumping data.
With a special laboratory pumping rig, which was developed for this program, very good correlations were obtained with the low temperature pumpability of the engine. The temperature where borderline pumping occurs can be predicted equally well by the mean flow rates at the beginning of pumping, or by the time to, when the first oil reaches the end of a capillary.
Recommended Content
| Technical Paper | Design Method of Small-Ripple Vane Pump |
| Technical Paper | Development and Evaluation of a Diesel Powered Truck Cooling System Computer Simulation Program |
Authors
Topic
Citation
Wiemann, W. and Bartz, W., "Investigations to Characterize the Low-Temperature-Fluidity of Polymer-Containing Engine Oils," SAE Technical Paper 780977, 1978, https://doi.org/10.4271/780977.Also In
References
- Lemke W. “Influence of viscosity on oil supply at low temperatures” Düsseldorf VDI-Verlag 1972 59 62
- Partington B. Pike W. C. “The effect of lubricants on the starting ability of automotive engines” Wear 17 1971 5 6 351 365
- Hollinghurst R. Hackett C.E.S. Marsen K. Wright R. A. “The cold cranking simulator and British engine cranking studies” SAE Paper 720526
- “Evaluation of Laboratory Viscometers for predicting Cranking Characteristics of engine oils at 0°F and -20°F” CRC Report No. 409 April 1968
- Meyer W. A. P. Selby T. W. Stringer H. R. “Evaluation of Laboratory Viscometers for Predicting the Cranking Characteristics of Engine Oils at 0°F and -20°F” SAE Paper No. 680065
- Smith R. M. Graham J. P. “Pumpability of multigrade engine oils at low temperatures” SAE Paper 710139
- Stewart R. M. Spohn C. R. “Some factors effecting the cold pumpability of crankcase oils” SAE Paper 720150
- Bartz W. J. “Comparing investigation of side flow of journal bearings lubricated with Newtonian and Non-Newtonian oils” Düsseldorf VDI-Verlag 1968
- Wissussek D. “The influence of reversible and irreversible viscosity changes on the behaviour of hydrodynamic steadily loaded journal bearings” 1975
- Bartz W. J. “Flow properties of multigrade engine oils at low and high temperatures” 19 1974 7 1 29
- Alexander D. L. Rein S. W. “Viscometer for Predicting Low-Temperature Pumpability of Engine Oils” SAE Paper No. 770632
- Bartz W. J. Wiemann W. “Determination of the Cold Flow Behaviour of Multigrade Engine Oils” SAE Paper No. 770630
- Bartz W. J. Wiemann W. “Flow properties of polymer blended engine oils at subzero temperatures” ASLE-Transactions 21 1978 2 152 160
- “Low temperature pumpability characteristics of engine oils in full-scale engines” ASTM Data Series Publication 57