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In a message dated 10/12/2002 8:54:40 PM Central Daylight Time, canarder@starband.net writes:
Subj: [FlyRotary] Re: EWP water pump
Date: 10/12/2002 8:54:40 PM Central Daylight Time
From: canarder@starband.net (Jim Sower)
Sender: flyrotary@lancaironline.net
Reply-to: <A HREF="mailto:flyrotary@lancaironline.net">
flyrotary@lancaironline.net</A>
To: flyrotary@lancaironline.net
<... as any variability in the water head pressure to the pump will skew the test
results ...>
Do you really think so? I mean significantly? I would intuit that your task is to
pump some certain minimum volume of water through the system. Say you had a 5- or 10-
gal supply tank, and kept the water level in the tank at about the elevation of the
input to the pump, and piped the output from the rads (right where it goes into the
pump) up over the edge of the water tank. You could then turn on the pump and WATCH
how much volume was pumped through the entire system. You're not simulating pressure
drop across the engine and radiators. You're observing the flow that you get in spite
of all that resistance. In a closed system, it doesn't make any difference what the
system pressure is. In this test, you're using virtually no pressure at the inlet
side, and just a few inches at output. You could document it with a flow meter, but
you'd get a pretty good go/no-go idea just watching it.
Just a theory .... Jim S.
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Jim makes a good point, but it can be carried a little further with little effort.
I have attached a GIF drawing, showing the plumbing modified to feed the pump from a reservoir, pump through the engine and rads, and back to the reservoir. With Todd's setup, this would be easy to do. Also, since it is electric, you can turn it on and off easily.
A simple timed test, where you divert the water from the reservoir into a separate bucket and measure the time for filling would give you a number for the flow rate as well as the visual test that Jim mentioned. The change in head of the reservoir can be minimized by making it larger, but probably not a big deal. Since the pump is electric, you can just turn it on, and then off at the same time as a stop watch, and get some pretty accurate numbers.
This way he doesn't have to take his assembly apart (other than one connection)
Bill Schertz
KIS Cruiser #4045
Electric Pump test.gif
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