Quote:
Originally Posted by swamp2
So is this accurate?:
-There are 6 different bearings. Are the adjacent numbers a top/bottom set?
|
088/089 is bottom/top
090/091 is bottom/top for oversize (first crank regrind)
702/703 is bottom/top for lead-free bearings
[/quote]-BMW slightly loosened bearing clearances and made the bearings much harder when implementing new lead free bearings? This happened in 2011 model cars?[/quote]
Not sure which model year the changes were made. We will track this as more motors are disassembled.
Quote:
|
What is the deal with the way thicker 090/091 bearings?
|
First oversize (first crank regrind).
Quote:
|
It's obviously very interesting to the vast majority of us as to which material/hardness you believe is right and which is wrong. It is pretty amazing that BMW has speced radically differing hardnesses in the exact same application with only a couple of tenths of size difference.
|
Note: When I measured the 702/703's, they measured the same thickness as 088/089's, but kawasaki got slightly different measurements -- a few tenths difference. I know I torqued both of them into a connecting rod to measure the bore diameter -- but I don't remember if I posted the results...and I don't remember off the top of my head what they were.