Does Copper Create More Drag within bearings?
05-09-12, 11:18 AM
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Does Copper Create More Drag within bearings?
I don't hear this spoken to much, Does Copper create more drag when a bearing is worn out?
Create harder starts and more work for the starter if Copper is showing on bearings? Or maybe just a lack of oil. Oil react to Copper the same as to the new bearing surface?
Will this also create hot start lag and Slow turning over of the engine? Thanks
Create harder starts and more work for the starter if Copper is showing on bearings? Or maybe just a lack of oil. Oil react to Copper the same as to the new bearing surface?
Will this also create hot start lag and Slow turning over of the engine? Thanks
05-09-12, 11:34 AM
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Without looking up the numbers and knowing them exactly, I would have a hard time believing that copper showing on the rotor bearings could create such great drag that it would then cause hard starting (or much harder than original). Yes, drag can really slow down any process, but considering everything that's involved in turning over an engine, I believe that copper on these bearings would be just a small fraction of the whole force that the starter needs to overcome.
05-09-12, 05:35 PM
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Even without oil pressure there should be enough oil film that the eccentric shaft almost never touches the bearing material. Even in a quasi-hydrodynamic lubrication regime during starting, any drag from the fluid would create very little torque because the moment arm is so close to the shaft centerline (torque = force x distance).
05-09-12, 07:40 PM
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Even without oil pressure there should be enough oil film that the eccentric shaft almost never touches the bearing material. Even in a quasi-hydrodynamic lubrication regime during starting, any drag from the fluid would create very little torque because the moment arm is so close to the shaft centerline (torque = force x distance).
B. copper means the bearing is worn so the clearance should be MORE, so friction should actually be lower. unless the bearing was run without oil and chewed up or something
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