> > 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

   Sounds like if it is working I should not fix it, I was looking for
a little better cooling but it seems like the small pulley is the way
to go.

Ken Welter

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org