Download or read book High temperature High shear HTHS Oil Viscosity written by James A. Spearot and published by ASTM International. This book was released on 1989 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relating High Temperature High Shear Rate Viscosity to Engine Operation written by JA. Spearot and published by . This book was released on 1989 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Change of High Shear Rate Viscosity of Engine Oils During Use written by DL. Alexander and published by . This book was released on 1989 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance written by Ross M. Stewart and published by ASTM International. This book was released on 1977 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance written by and published by ASTM International. This book was released on 1978 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engine Oil Viscosity Classification written by SAE International (Society) and published by . This book was released on 2013 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book History of ASTM Involvement in High Temperature High Shear Oil Viscosity Research written by MF. Smith and published by . This book was released on 1989 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1978 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance written by and published by ASTM International. This book was released on 1977 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between High temperature Oil Rheology and Engine Operation written by ASTM Task Force DO2.O7.OB TF/EC on the Correlation of High-Temperature Oil Rheology with Engine Performance and published by ASTM International. This book was released on 1985 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance Part Iv written by and published by ASTM International. This book was released on 1978 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance Part II written by and published by ASTM International. This book was released on 1977 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance written by and published by . This book was released on 1978 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Analytical Methods in Tribology written by Ilya I. Kudish and published by CRC Press. This book was released on 2010-07-20 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improving our understanding of friction, lubrication, and fatigue, Modeling and Analytical Methods in Tribology presents a fresh approach to tribology that links advances in applied mathematics with fundamental problems in tribology related to contact elasticity, fracture mechanics, and fluid film lubrication. The authors incorporate the classical tenets of tribology while providing new mathematical solutions that address various shortcomings in existing theories. From contact interactions to contact fatigue life, the book connects traditionally separate areas of tribology research to create a coherent modeling methodology that encompasses asymptotic and numerical techniques. The authors often demonstrate the efficacy of the models by comparing predictions to experimental data. In most cases, they derive equations from first principles. They also rigorously prove problem formulations and derive certain solution properties. Solutions to problems are presented using simple analytical formulas, graphs, and tables. In addition, the end-of-chapter exercises highlight points important for comprehending the material and mastering the appropriate skills. Unlocking the secrets that govern the physics of lubricated and dry contacts, this book helps tribologists on their quest to reduce friction, minimize wear, and extend the operating life of mechanical equipment. It provides a real-world industrial perspective so that readers can attain a practical understanding of the material.

Download or read book Handbook of Thermal Management of Engines written by P. A. Lakshminarayanan and published by Springer Nature. This book was released on 2022-01-01 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook deals with the vast subject of thermal management of engines and vehicles by applying the state of the art research to diesel and natural gas engines. The contributions from global experts focus on management, generation, and retention of heat in after-treatment and exhaust systems for light-off of NOx, PM, and PN catalysts during cold start and city cycles as well as operation at ultralow temperatures. This book will be of great interest to those in academia and industry involved in the design and development of advanced diesel and CNG engines satisfying the current and future emission standards.

Download or read book The Relationship Between Engine Oil Viscosity and Engine Performance Part III written by and published by . This book was released on 1978 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Co ordinating European Council CEC Contribution to the Measurement of High Temperature High Shear Rate Viscosity and Its Relationship to Engine Operation written by TW. Bates and published by . This book was released on 1989 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Co-ordinating European Council (CEC) studies showed good agreement among results obtained with different types of high-shear viscometers. Curve-fitting procedures based on the Extended Cross Equation provided a means of comparing results from different viscometers and permitted the interpolation and extrapolation of viscosities to a standard temperature and shear rate, for example, 150°C and 106 s-1. These studies contributed significantly to the development of the first low-cost, commercial, rotational viscometer capable of measuring viscosity over appropriate temperature and shear rate ranges. Satisfactory precision was demonstrated, and international standard procedures were established for the Ravenfield viscometer. Engine studies showed strong linear correlations of high-temperature, high-shear (HTHS) viscosity with engine friction, engine-bearing oil flow, and fuel saving. Results of engine wear tests, however, did not appear to be viscosity dependent. Areas for future study, for example, measurement of bearing oil film thickness, are indicated, and the interaction of CEC with the European Committee of Common Market Automobile Constructors (CCMC), ASTM, and the Society of Automotive Engineers (SAE) is described.