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

You may be the exception Ken.  Stock pulley ratio has an onset of cavitation
around 7200 - 7500 rpm. On the RV-4 I use the RB pulleys on the crank and
alternator (mainly to slow down the alternator) but cooling was slightly
better with the stock crank pulley.  I'm using stock pulley on the 20B crank
(RV-8 setup) and the RB oversize alternator pulley.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

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