Quote:
Originally Posted by Z K
Of course they don't wear evenly. Every BMW M engine rod bearing is worn unevenly when pulled out.
When the bearing wears, it will take the brunt of the wear instead of the crankshaft. That's what I mean when I say they "increase clearance" - it wears in to clearance the crankshaft of the debris or whatever is causing the wear. All the aftermarket increased clearance bearings use the softer lead/copper design rather than the newer BMW hard bearing design for this reason.
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Not really.
Hydrodynamic bearings should not wear. Wear like we see on typical S65 is not normal.
What the softer Babbitt is good for is embedability. Particles will get smooshed into the Babbitt rather than scoring the crank. Lead/copper is better at embedding debris than tin/aluminum Babbitt.
Cheers,