I was worried about the wrap on the e-shaft pulley and I needed to lower
the alternator to make room for my intercooler so I designed
this idler. It will run up to 10,000 RPM with a 6000 RPM engine
so the bearing was choosen for those conditions. It is a lot like a
water pump bearing.

Paul Lamar

Jeff Spitzer wrote:

Looks good, Paul.  Make sure you emphasize the importance of proper fit on
that bearing.  If not, the outer race may "spin" in the pulley due to speed
fluctuations and cause an overheat failure.

Jeff Spitzer

OK Jeff I will press fit the "pulley" on the bearing.
It works on the back side of the belt so the friction force is not as high
as the v belt side. Hopefully the belt will slip a bit during rapid
accelerations.

Paul Lamar
 
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