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| Author | : James A. Spearot |
| Publisher | : ASTM International |
| Total Pages | : 109 |
| Release | : 1989 |
| Genre | : Automobiles |
| ISBN | : 0803112807 |
| Author | : JA. Spearot |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1989 |
| Genre | : Automobiles |
| ISBN | : |
The argument over which values of oil viscosity best correlate with measures of engine operation has gone on for many years. Over a decade ago (1977), the membership of the Engine Oil Subcommittee of the Society of Automotive Engineers (SAE) Fuels and Lubricants Committee (now the Fuels and Lubricants Division) agreed that there were enough data to justify asking the appropriate ASTM subcommittee (D02.07) to develop methods for determining values of high-temperature, high-shear-rate (HTHS) oil viscosity and to relate them to engine operation. In 1984, an ASTM task force finished reviewing the available literature and composed a report that summarized the effects of viscosity on bearing oil film thickness, engine wear, engine friction, and fuel economy (ASTM DS-62). This paper reviews the findings of that report and updates them in light of recent studies. The case for incorporating HTHS viscosity specifications into the Engine Oil Viscosity Classification, SAE J300, is presently stronger than ever. Suggestions are offered on how this incorporation might be accomplished and on what future directions ASTM research on HTHS viscosity should take.
| Author | : Ross M. Stewart |
| Publisher | : ASTM International |
| Total Pages | : 112 |
| Release | : 1977 |
| Genre | : Automobiles |
| ISBN | : |
| Author | : |
| Publisher | : ASTM International |
| Total Pages | : 116 |
| Release | : 1978 |
| Genre | : Automobiles |
| ISBN | : |
| Author | : DL. Alexander |
| Publisher | : |
| Total Pages | : 14 |
| Release | : 1989 |
| Genre | : Automobiles |
| ISBN | : |
It has long been known that the kinematic viscosities of multigrade engine oils change with use, the typical pattern being an initial decrease followed by a gradual increase. Recent work has shown that the patterns of change of the high-temperature, high-shear (HTHS) viscosity are different than those of the kinematic viscosity. These results, coupled with recent bearing oil film thickness results, suggest that kinematic viscosity changes are less significant in the operation of the bearings of engines than has been assumed. The pattern of HTHS viscosity change has been found to depend on both viscosity index (VI) improver type and engine test. Oil-thickening effects tend to be more prominent in the HTHS viscosity patterns than in the kinematic viscosity patterns.
| Author | : SAE International (Society) |
| Publisher | : |
| Total Pages | : 9 |
| Release | : 2013 |
| Genre | : Lubricating oils |
| ISBN | : |
| Author | : MF. Smith |
| Publisher | : |
| Total Pages | : 11 |
| Release | : 1989 |
| Genre | : Automobiles |
| ISBN | : |
ASTM involvement in high-temperature, high-shear (HTHS) viscosity research began in December 1977, as a direct result of a request by the Society of Automotive Engineers (SAE). The essence of the SAE request was to develop an HTHS viscosity measurement that correlates with engine performance, either in bearing wear or piston ring wear. The ASTM project began as a task force effort and later grew into a section activity. Initial efforts consisted of defining objectives and developing plans for the cooperative research required. A questionnaire to develop inputs on important issues was sent to engine manufacturers, oil companies, and oil additive companies. The response to the questionnaire provided guidance for the HTHS viscosity program. After considerable debate, the task force changed its objective to focus on the development of an HTHS viscometer. To accomplish this, the task force created three subgroups to channel the efforts in the most efficient manner. The viscometer development groups have accomplished their objectives; three ASTM methods have been written and approved.
| Author | : |
| Publisher | : |
| Total Pages | : 128 |
| Release | : 1978 |
| Genre | : Materials |
| ISBN | : |
| Author | : |
| Publisher | : ASTM International |
| Total Pages | : 120 |
| Release | : 1977 |
| Genre | : Automobiles |
| ISBN | : |
| Author | : ASTM Task Force DO2.O7.OB TF/EC on the Correlation of High-Temperature Oil Rheology with Engine Performance |
| Publisher | : ASTM International |
| Total Pages | : 114 |
| Release | : 1985 |
| Genre | : Automobiles |
| ISBN | : |
