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Re: [FlyRotary] Re: EWP
On 11/6/04 12:14 PM, "Russell Duffy" <13brv3@bellsouth.net> wrote:
So I will add to Bulent's question - what will be the current draw at 25 gallons per minute when installed in a functioning cooling system?
Ken Powell
I'm going to put a meter on mine, maybe today. In the mean time, below is an excerpt from one of Todd's posts that I found in the archive. Current is WAY low on the Davies Craig pump. If I can verify this, I'd say there's no problem running one of them when the alt fails.
Cheers,
Rusty (mourning the departure of one of my fillings)
Hi Guy's
I brought home a new mag tube & transmitter, which I tested first against a calibration standard, so I'm certain of it's accuracy. I ran a full set of tests tonight and was somewhat surprised at the results.
I ran the first test with the Ford evap cores in the system, plumbed in parallel.
- Max flow 9.3 usg/m 35 l/m
- 12.07 volt battery supply voltage
- .49 amps current draw
- 1.8 amps max inrush current
Second test had no evap cores in the system. Simply recirced water through pump - engine - header tank - pump.
- max flow 13.0 usg/m 49 l/m
- 12.06 volt battery supply voltage
- .37 amps current draw
- 3 amps max inrush current.
Third test, I plumbed in a set of GM (Harrison) evap cores in parallel, into the system. I hung them just below my mounted Ford cores, using they same pipe sizes in an effort to have comparable test conditions.
- max flow 7.7 usg/m 29 l/m
- 12.4 volts supply voltage (I hooked a trickle charger to the battery)
- .47 amps max current draw
In each test configuration test results are with heater valve closed. Heater core added .5 usg/m in each case.
In all of the above tests the electronic pump controller was bypassed to give full battery voltage to the pump. With the pump controller in use, as the water was cold well water, controller had pump at minimum flow which was measured at .6 usg/m - 2.2 l/m. I suppose I should have dipped the RTD probe into hot water to watch the flow increase, however all test equipment is packed up and system is back together.
Hi Rusty, I have hard time believing these Amp draw figures? I sell gear pumps on my web site and have tested them on our bench. Even the 3 gpm pump uses about 5A minimum without load. Our 6 GPM pump is rated 15A 12V. Somehow you are getting free lunch :)
--
Bulent Aliev
Enginegear
Ft Lauderdale, FL
954 557-1019
954 784-5519 Fax
http://www.enginegearonline.com
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