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Back in 2002 I measured the flow from a 13-B pump,
attached to the engine but driven with an electric motor. The curve is attached.
I ran the pump at 3 different RPM, established by changing the pulley size on
the motor. At 5594 rpm, the pump produced 19 psi at zero flow, and 44 gpm at 0
psi. At lower RPM, the pump of course pumps less.
The other test I did was to measure the flow
through one core of the two I was using for my installation. That is the curve
going up to the right with the red dots as the experimental points. Since I am
running my cores in parallel, the right hand rising curve is a 'calculated' flow
response for the parallel cores.
Finally, I hooked up the cores to the system, and
pumped water through them. The single large point represents where the flow and
pressure came out, very close to the calculated expected response.
All flow measurements were done by the "bucket and
stop-watch" technique, with multiple runs to get the flow.
Bill Schertz
KIS Cruiser
#4045
N343BS
Phase I testing
Sent: Wednesday, May 12, 2010 11:54 AM
Subject: [FlyRotary] Re: alternative water pump
Al,
Are
you sure of the 40 GPM? That seems like a lot. My radiator in/out is
1.25 inches, so the water would be traveling at 628 feet per minute at that flow
rate. That is over 7 miles per hour!
Bill
B
When my 20B (with a
13B pump that Atkins referred to as ‘high flow’) was on the dyno the measured
flow was 48 gpm with the standard pulleys. I expect the dyno cooling loop
was fairly low pressure drop compared to our typical systems, so I’m just
guessing 40 gpm is in the ballpark. 628 fpm (10.5 ft/sec) would not be
considered very high - - above 15 ft/sec I’d consider high.
Al
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