The first measurements of oil film thickness in the main bearings of an engine in an operating vehicle are reported. Experiments have been conducted during 0-65 mph vehicle acceleration on a test track. With some commercial oils, upon initial vehicle acceleration, oil films on the order of 0.01-0.1 microns occur. As the acceleration progresses the thickness of the minimum oil film occurring in each engine cycle increases and reaches a plateau beyond the first transmission shift. Under identical conditions the shape and magnitude of the minimum oil film thickness traces are different for different main engine bearings.
Oil Film Thickness in a Bearing of a Fired Engine — Part IV: Measurements in a Vehicle on the Road
Sae Technical Papers
1986 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1986
1986-10-01
Conference paper
English
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