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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Electric Water Pump
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Sat, 19 July 2003 11:55
 
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they do sound like a good idea, but depends on how much power they draw (up to 7.5A) and flow rate (20-80L/min) and if it will die at operating temp/pressure.
according to http://www.daviescraig.com.au/trade_g1.html 80L/min should be equivalent to a 4K motors water pump ??.
but with 'more modern' 6cyl water pump flows 88L/min
http://www.daviescraig.com.au/trade_g2.html
they also say that
"CSIRO testing on a standard 6cyl. Radiator confirmed that above a coolant flow rate of 60-80L/min through the radiator for a constant radiator air velocity, no extra heat is dissipated."
after reading 'Smokey Yunicks Power Secrets" he reckons he needs 100gallons/min (380L/min) in a small block chevy putting out 500-600hp at 7000-8000rpm. he calculated that based on the fuel used and thermal efficiency of the motor/radiator.
they also reckon that 6kw will be needed to drive a water pump at 5500rpm (engine rpm)....
http://www.daviescraig.com.au/trade_g4.html
i guess it comes down to wether the pumps will provide enough flow to extract enough heat from the engine. it will certainly decrease the drag on the crank, but add 7.5 amps to alternator drag/consumption.
i think it could be quite good on a small motor (lie mine  ) but on a high power turbo motor? dunno. you could always run two? or have the EWP flowing extra water thru the head form the back (and leave stock pump in place)... sounds like they have done their homework, but maybe it is only sufficient for stock 6cyl motors doing 'fmaily' things??
if someone wants to donate one, i'll fully test it on my motor 
Cya, Stewart
| mrshin wrote on Sat, 19 July 2003 18:45 |
Has anyone here actually tried a Davies Craig EWP? In theory they sound like a top idea, but some people seem intent on telling us they are flawed/useless - what have others amongst us found? 
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