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.

Paul Lamar

Ken

I am using the smaller crank pulley on my RV6A with the 2.85 gearbox and

13psi rad. cap.
No problems taxiing or fast cruise but first 4000' climb on a very hot day
has to be limited to 500-1000ft/min.
Ian Beadle Australia.

Ian get a higher pressure cap. I think that will help. Have you built a water
manometer and checked the aero pressures on both sides of the radiators?

Paul Lamar
 
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