R c wrote:

I'm looking for a redundant pulley/belt system for my 13b.  I figure that
two belts are better then one.  Racing beat makes a dual main($62) and
alternator pulley ($42), are there makes or better buys out there??

Racing beat tells me that their pulley system brings down the water pump and
alternator RPM down by 20% to prevent water pump cavitation.  Has anyone run
into water pump cavitation problems at 6000+ rpm?

No it happens at 7500 to 8500 RPM. If you are running a 2:1 PSRU run the stock
pulleys.

Paul Lamar

 Be careful with belt systems. We have Leadwell CNC mills at the shop
that have the spindles driven by a pulley belt system (4 belts). When one
belt broke it & the  pieces would get caught under the other belts &
break them as well. It would never fail to happen this way. So now we
only use one belt.
 For this reason I would not go with a belt drive on an airplane unless
there is some kind of divider plate separating the 2 belts from
interfering with each other if one would break.

Just a thought.

Rich

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