Quote:
Originally Posted by southernstar
Kirk, I look forward to your updates. With a failure rate of approximately 1%, I would think that if you had a dual-row bearing you would likely be fine with a new dual-row steel bearing and DOF. With the single-row bearing, however, I wonder if the additional cost of a good ceramic bearing might not provide added insurance.
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I am not worried about cost. I have both - steel and ceramic bearings in my hands. I can put either in my 2003 C4S. The ceramic would be the obvious choice, right? My only concern there is the nylon cage that holds the balls in position. I have been researching this material to see how well it will hold up in a hot environment exposed to synthetic oil constantly. I see manufacturer's temperature specs ranging from 210 to 250 F. But we know that the bearing seal is rated for 250 F and it does not hold up well. I thought I saw that LN Engineering uses a steel cage, but I have not confirmed that. I know that Casper Labs used a steel cage precisely because the temperature limit of the nylon cage is too close to the hot operating limit of a Porsche engine. So I'm not sure I feel comfortable putting a ceramic bearing with a nylon cage in my car... Still reading and researching before this weekend.  One advantage of the DOF is that the better lubrication should allow the bearing to run cooler.
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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