| Re: Engine lubrication [message #357651 is a reply to message #355638] |
Tue, 11 August 2020 20:50   |
rickmike
Messages: 252
Registered: September 2011
Location: United States
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JohnL455 wrote on Sat, 13 June 2020 13:02J.R. If GM says 10W-30 then what is your logic that 20W-50 is “better”? Seems it would exasperate the gravity drain back issues. Most builders today don’t like heavy oils as they pull less heat from bearings and heat kills soft bearings
The oil GENERATES the heat in hydrodynamic bearings The more viscous the oil, the more heat is generated in the bearing and the thicker the oil film that separates the shaft from the shell(up to a certain point). And yes, it carries the heat away too.
They use lighter weight oils today to generate less heat thus less friction losses. The bearings are designed for the lower viscosity oil.
Rick Michelhaugh
1974 26' Canyonlands
aka "The General"
Clinton, TN
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