Quote:
Originally Posted by Helmsman
Haven't looked into the BE page for long (and it has been gone for a while), but you mean wall thickness between the shells are pretty much the same incl BE? (again, except for the extended)
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If you take an average of the min / max measured figure for the top & bottom shells combined then yes. The OE parts (if an accurate measurement) there is one out of tolerance. For ACL also based on the tolerance you were given by them.
The other anomaly is the assumption that the OE parts always use 1 of each colour code. Yes, this is the way it is presented in the BMW OEM catalogue, but it makes no sense to have graded parts and always to fit the same parts regardless of tolerance on the crank & rods. This could be achieved with a single bearing as both shells are the same design and material.
To me this suggests that a combination of red / red, red / blue or blue / blue were used depending on the crank & housing size inline with standard OEM grading schemes. Unless a number of used sets with the colour codes still visible can be found and these documented against crank & housing size this will have to remain a reasonable assumption. And yes, it is not unknown for BMW OEM catalogue to have an error. I know of one vehicle where it states only 7 main bearing bolts are required
