LABORATORY TESTING OF FUEL EFFICIENT OILS

A laboratory dynamometer/engine test procedure is described for acquiring fuel consumption data under various operating conditions. A unique aspect of the procedure is the evaluation of fuel consumption at two jacket temperatures. This permits the evaluation of changes in viscosity without changing oil. The ratio of fuel consumption at low temperature to that at high temperature has been defined as viscosity sensitivity index (VSI). If fuel consumption decreases with increased temperature (negative VSI), a large hydrodynamic lubrication component is evident. If fuel consumption increases with increased temperature (positive VSI), boundary lubrication has increased. The test procedure enables engine condition and oil effects such as relative film thickness, apparent viscosity, and friction modifier effectiveness to be evaluated.

• Supplemental Notes:
  • Also published in HS-028 993 (SAE-SP-460), "The Relationship between Engine Oil Viscosity and Engine Performance, Pt. 5 and Pt. 6," Warrendale, Pennsylvania, 1980 p 97-106. Presented at SAE Congress and Exposition, Detroit, 25-29 February 1980.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Hart, W
  • Klaus, E E
• Publication Date: 1980

Media Info

• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Engine oils; Fuel consumption; Laboratory tests; Oil spills; Thickness; Thin films; Viscosity
• Old TRIS Terms: Oil-film-thickness
• Subject Areas: Energy; Safety and Human Factors;

Filing Info

• Accession Number: 00393486
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 790731, HS-029 000
• Files: HSL, USDOT
• Created Date: Mar 29 1985 12:00AM