Quote:
Originally Posted by Scharbag
The bearings DO NOT WEAR EVENLY AND INCREASE THE CLEARANCE. If copper is showing, the bearings were done. Kaput. Fooked.
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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.