I ran the pump at 7000 RPM today using the eight inch pulley. Max flow
     was about 55 GPM at a 5 psi pressure differential across the pump.
     The fish scale read 2.9 pounds. This worked out to over 2.1HP !!!

     If it were electric driven that would be 1567 watts or 131 amps
     at 12 volts 100% eff. At 80% eff. it is 163 amps!!!!!!!!!

     My guess is the pump is starting to
     cavitate but I am not sure. Vance witnessed the test and we both
     feel if you are running a 2.85:1 PSRU ratio you should use the Racing
     Beat smaller E-shaft pulley to slow the pump. Other wise the pump
     will be pushing 8000 RPM on takeoff

Great info Paul. An interesting side note. I spoke with Steve Weinzierl who 
did the current Powersport drive some time ago, and
he said the max flow they could get from the stock pumps WAS ta da ... 56 gpm. 
This flow rate was right at the edge of
caviation. The speed was approximately 7000 pump RPM, They were unsure of 
the required HP. I am actually suprised that the HP
requirement was that LOW. The Meziere pump, which will flow more, is listed 
as requiring as much as 3.5 HP to produce 65 gpm.
The max closed circuit pressure is shown at 30-35 psi. It seems like 
you are getting "good data". Bill Jepson

I am not entirely happy with the valve that is in there but I am anxious
to get the flow meter and pressure gages on the dyno engine and get some 
actual pressure drop data on the block and rad. 

Me and Vance have spent enough time and money on this test rig.
Now I have to find another use for that 5 HP electric motor. I guess I could
put it on my old CC mill :) What I really need is a Do All with a bad motor.

Paul Lamar
 
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