I reinstalled the 6" pulley and set up the flow system to pump through my
evaporator cores plumbed in parallel.  Pictures are attached.

I borrowed a optical digital tach to measure the actual pump rpm, however
this created an unusual opportunity.  It works by counting pulses, and the
flourescent lights give a reading of 3600 rpm due to the 60 cycle current.
Therefore to measure the rpm, I had to run it in total darkness with a
flashlight illuminating the pulley.  I used two strips of foil on the pulley
to reflect light pulses back to the tach.  The pump rpm with a 6" pulley on
the 3450 rpm motor was 5160 RPM.

I then plumbed my evaporator cores in parallel as shown in "Parallel cores"
photo.  These were hooked to the pump outlet, and full flow tests were
performed.

Motor RPM = 3450
Pump RPM = 5160
Pressure generated at no flow = ~20 psi
Pressure generated at full flow, no evaporator cores in line = 2.5 psi
Pressure with cores in place = 8 psi
Time to fill 5.8 gallons = 14-15 seconds (flowing through rads) = 23-25
gallons per minute.
Current on ammeter = 13 amps = 1560 watts

2.1 HP in ? Are you sure you have that amp meter set right?

Interestingly, the current on the motor with no load (i.e. only spinning
itself) was ~10 amps, which I don't understand. Can someone who knows more
about motors help expain that?

Bill Schertz
KIS Cruiser #4045

 
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