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Thanks for the info, OP. Similar to what someone asked in the parallel thread on this issue - why did BMW do this?
Perhaps, the tight clearance stems from some kind of performance based standard that originated in F1 or some other racing development? If they carried over specs from race engines that likely see rebuilds long before road-going passenger vehicles ever would, then maybe there wasn't sufficient data on the long-term reliability.
I suppose it's immaterial, the clearance data itself being outside of industry standard should be enough to deter them.
Ultimately, it still comes down to either BMW didn't know, or worse, they didn't care.
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