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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,640
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Yeah, it appears to me that the tin layer on the IMS bearings is very thin, like it's a thin plating, rather than a layer of tin. It also appears that it gets worn off quickly, and then the bearings work for several hundred thousand more miles. IMS bearing failures are also very rare in these engines, unlike the ball bearing IMS failures in 996 engines. The more robust Metzger versions of the 996 engines used plain bearings too.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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