Laboratory Testing of Fuel Efficient Oils

790731

02/01/1979

Event
Passenger Car Meeting & Exposition
Authors Abstract
Content
This paper describes a laboratory dynamometer/engine test procedure for acquiring fuel consumption data under a variety of operating conditions. A unique part of this procedure is the evaluation of fuel consumption at two jacket temperatures. This permits an evaluation of changes in viscosity without changing the 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 (neg. VSI), a large hydrodynamic lubrication component is in evidence. If fuel consumption increases with increased temperature (pos. VSI), boundary lubrication has increased. By this technique, engine condition and oil effects such as relative film thickness, apparent viscosity, and friction modifier effectivness can be evaluated.
Meta TagsDetails
DOI
https://doi.org/10.4271/790731
Pages
12
Citation
Hart, W., and Klaus, E., "Laboratory Testing of Fuel Efficient Oils," SAE Technical Paper 790731, 1979, https://doi.org/10.4271/790731.
Additional Details
Publisher
Published
Feb 1, 1979
Product Code
790731
Content Type
Technical Paper
Language
English