Ken Welter wrote:
 >
 >   From day one I have been running a smaller racing beat crank pulley
 > as I was told that you need to slow the water pump down to stop
 > cavitation but I am using  Evans coolant and they say you can speed
 > up the water pump with there coolant without cavitation so I wanted
 > to know what most of you that are flying are running for a pulley.
 > --
 > Ken Welter

 I might add Ken is using a 2.93:1 (or there abouts) gear box so he runs
 his engine faster than most everybody else. Up to 8000 RPM.

I have been running that same sized pulley for years without a problem, up to
9,500 RPM. I also ran the stock pulley up to 9,500 without a problem. I run a
restrictor in the water outlet to increase pressure in the block, and a 16
pound Stant lever style pressure cap. Never had a problem with overheating or
pump damage from cavitation. I would stick with the small pulley and a 16 or
22 pound cap.

 
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