' most friction in an engine '
' Two-thirds of friction losses in an engine are estimated to occur during hydrodynamic lubrication'.
Prepared by Energy and Environmental Analysis, Inc., for Oak Ridge National Laboratory, December, 2001.
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' One-third of friction losses in an engine are estimated to occur during boundary region, mixed-film region, and elastohydrodynamic region lubrication'. aerohead, April 14, 2025.
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