In our previous post, we determined that the troll hitting the inside of the motor with a hammer lived in cylinder #6. So we pulled the oil pan, got to the bearings, and boy did that troll do a number on the bearings:
New bearings are in. We threw some zinc rich oil into the motor, fired it up, and the troll from cylinder #6 is no longer angry. The BMW recommendations for rod bearing break in are something to the tune of "for 1000 miles do not go over 5500 rpm, do not exceed 100mph". Either we're going to put down lap times comparable to a Corvair, or we'll give the rod bearings a proper "racing break in".