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The fan with the outer ring was the design used for diesel cars in Europe. The ring-less ("normal") fans were used here in N America. After many of those failed because they "exploded" when getting in touch with the shroud and some were cutting coolant hoses, some were going through the hood, BMW applied the same design to the v8's, and it seems now to the i6.
So when the motor mounts fail and the fan will hit the shroud, there is at least some "give" from the round lip not catching like blades did.
0.02
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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.
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06-22-2015, 10:28 AM
Hybrid Mode
