X-Mozilla-Keys:                                                                                 
Jeff Spitzer wrote:

At 12:31 PM 8/9/99 -0700, you wrote:

Usually only one bearing out of the two required is a ball
bearing. The other is a floating plain bearing needed for
damping weird vibratory modes.

Let me clarify my density statement. The life of the
low density ceramic ball bearing is only twice as long as a steel
ball bearing which nobody uses in a modern turbo charger anyway.

Paul

The reason "nobody" (sic) uses ball bearings is because they are
ferrociously expensive compared to the plain bearings and don't last as
long.  The ceramic bearings can get around the life issues but the cost
remains.

Jeff Spitzer

 
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