BETTER PREDICTION OF ENGINE OIL PUMPABILITY THROUGH A MORE EFFECTIVE MRV COOLING CYCLE
The Mini-Rotary Viscometer (MRV), adopted by SAE in 1980 to predict engine oil pumpability, was unable to fail certain commercial oils that caused engine problems in the winter of 1980-81. The latter oils did fail in the seven-day Federal Stable Pour, Cycle C, Test (FSPCCT). A special study of the FSPCCT temperature cycle in the MRV highlighted the importance of a slow cooldown rate in the temperature range of engine oil cloud points. Using this principle, a modified one-day MRV test was developed that fails 1980-81 problem oils. Further modification, however, was required to detect a newly discovered problem oil, PRO-29. Failure-prone oils discovered since 1980 are very sensitive to subtle changes in cooling rate and temperature regime. As the industry proceeds to develop a more effective MRV test, a better insight into the pumpability problems of 1980-81 has been gained.
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
- Fuels and Lubricants Meeting San Francisco, California, October 31-November 3, 1983.
Warrendale, PA United States 15096
- Smith Jr, M F
- Publication Date: 1983
- Features: Appendices; Figures; References; Tables;
- Pagination: 16 p.
- TRT Terms: Cooling; Engine oils; Rheology; Studies; Temperature; Viscometers
- Old TRIS Terms: Pumpability; Rheological studies
- Subject Areas: Safety and Human Factors;
- Accession Number: 00390908
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 831714, HS-036 830
- Files: HSL, USDOT
- Created Date: Nov 30 1984 12:00AM