Thanx Bill, I was stewing on the DP and thinking that the restrictor at the
thermostat housing was essentially an orifice. It may be too large but I
should tap in some gauges and see if there's a Delta. I keep looking at
modern centrifugal pumps hoping to find a nice impeller we can use but
nothing yet.
Thanks, Steve
<<
If you really want to measure what the pump is doing you need a
differential pressure across it--from suction to discharge. Then it won't
matter much that the temperature is varying the pressure in the system.
These are pretty simple centrifugal pumps with a huge amount of gap
between the housing and impeller. I'm not surprised that they don't do
much at idle. They have to be designed to work in a range from 750 RPM to
over 5000 without eating up all the horsepower.
|