Engine Oil Viscosity Classification Low-Temperature Requirements - Current Status and Future Needs

Engine Oil Viscosity Classification Low-Temperature Requirements - Current Status and Future Needs
Author: JA. Spearot
Publisher:
Total Pages: 21
Release: 1992
Genre: Automobiles
ISBN:

The evolution of low-temperature viscosity requirements in the Engine Oil Viscosity Classification, SAE J300, began in 1923 with the introduction of simple limits on the pour point of selected viscosity grades. Since then, low-temperature requirements have evolved into a complex specification system that includes a separate designation (i.e., the "W-grades"), laboratory "cranking" and "pumping" simulators, and complex cooling cycles to which an oil must be subjected prior to measurement. These requirements have been incorporated into SAE J300 with the objective of improving its ability to specify the oil properties necessary for good engine starting and operation at low-temperatures. The current lack of field problems related to low-temperature operation of both light- and heavy-duty vehicles provides one indication of the success with which SAE J300 meets this objective. However, the last decade has witnessed significant changes in engine design to meet more stringent emissions and fuel economy regulations. For this reason, it is time for the industry to re-evaluate the low-temperature viscosity specifications in J300 to determine if they represent the optimum values needed for modern engine designs.

Oil Flow Studies at Low Temperatures in Modern Engines

Oil Flow Studies at Low Temperatures in Modern Engines
Author: Hal Shaub
Publisher: ASTM International
Total Pages: 174
Release: 2000
Genre: Internal combustion engines
ISBN: 0803128576

Scientists and engineers consider how the lower starting temperature of new engine designs will impact the flow of oil through them, and how new oil can be developed to address the changes. Seven of the 11 papers, presented to a June 1999 symposium in St. Louis, Missouri, report on a study by a comm

Low Temperature Lubricant Rheology Measurement and Relevance to Engine Operation

Low Temperature Lubricant Rheology Measurement and Relevance to Engine Operation
Author: Robert B. Rhodes
Publisher: ASTM International
Total Pages: 190
Release: 1992
Genre: Automobiles
ISBN: 0803114389

Papers were presented at a symposium held in Austin, Texas, in December 1991. Subjects include a history of ASTM accomplishments in low temperature engine oil rheology from 1966-1992, critical aspects of pumping viscosity by mini-rotary viscometer, the scanning Brookfield technique of low temperatur

Engine Oil Viscosity Classifications-Past, Present, and Future

Engine Oil Viscosity Classifications-Past, Present, and Future
Author: ML. McMillan
Publisher:
Total Pages: 11
Release: 1977
Genre: Lubricating oils
ISBN:

An extensive effort is under way to revise the SAE Engine Oil Viscosity Classification System to reflect user needs more realistically. To understand how the present system evolved, the history of the classification is traced, from the original version first published in 1911 to the present 1976 version. Reasons for both high- and low-temperature viscosity grades, multigrading, and footnotes to the viscosity table are discussed, as well as other classification systems which have been discarded over the years.

Modeling and Analytical Methods in Tribology

Modeling and Analytical Methods in Tribology
Author: Ilya I. Kudish
Publisher: CRC Press
Total Pages: 928
Release: 2010-07-20
Genre: Technology & Engineering
ISBN: 1420087010

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.