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Location:
Montrose, VIC
Registered:
May 2002
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Electric Water Pump
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Sat, 19 July 2003 08:45
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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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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Electric Water Pump
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Sat, 19 July 2003 08:51
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I can tell you now that they work great for garden pond pumps 
I think they are a great idea and I will probably use on in the future.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Electric Water Pump
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Sat, 19 July 2003 09:12
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From memory I thought Nark was using one of them for his water/air interwarmer...
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Electric Water Pump
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Sat, 19 July 2003 09:39
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is max still kicking around with a top mount?
where is he, I gotta kick some sense into him. (and no, wedding expenses/rings are not a viable excuse for not pouring all your savings into your car  )
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Electric Water Pump
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Sat, 19 July 2003 09:40
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He actually retro-fitted the water/air cooler in favour of a front mount.
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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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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: Electric Water Pump
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Sat, 19 July 2003 12:30
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| draven wrote on Sat, 19 July 2003 19:39 |
is max still kicking around with a top mount?
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There's nothing wrong with a w/a for street applications. Sorry, but I don't go for the big shiny thing up the front of my car... 
I have a Davies Craig Electric Booster Pump... EBP, not EWP. It's much lower volume, I don't need to push 80L/min for my i/c!!!
| draven wrote on Sat, 19 July 2003 19:39 |
where is he, I gotta kick some sense into him. (and no, wedding expenses/rings are not a viable excuse for not pouring all your savings into your car )
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I've spent $7k in the last two weeks buying furniture for the new place! That's on top of the deposit for the friggin apartment (with which I could've easily bought two JZA80s).
Also gave the ACT government $9.5k! Grumble stamp duty grumble.
Imagine if that money went into my car......... *que dream music*
<reality>
*sob*
</reality>
$30k of the deposit was actually money I'd saved up for a JZA80 too.   
I was this close, just had to find a good one.
Ah well.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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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 13:00
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Hmm, Julian edgar is implying there's something wrong with them
http://www.autospeed.com/cms/A_0569/article.html
and a holden owner fitted one to an LS1 motor and didn't seem to like it (hmm, did he read that it's design is based around a 6 cyl heat level?)
http://www.holdenls1.com/index49.html
but it sounds like this guy didn't have much idea... he reckons he spent $3000 trying to have it fitted (by Starr performance?)..
it sure does sound easy to fit, but it sounds like there was something seriously wrong with what was done. even if it only ran the way it was designed to, it shouldn't cause overheating in '500m of driving' ?does any engine other than a holden one do that
this guy used on an Ultima-GTR (looks ..nice?)
http://www.ultima-gtr.info/ubuild011.htm
but was not sure if it helped or not... looks like he used it to piggyback his existing pump..
price? from http://www.autosportoutfitters.com US$248 for the pump and $US135 for the controller.
from their press release
The recomended retail for the pump (P/N 8005) is $280.28 and the smart controller (P/N 8010) is $271.70
hmm, pretty pricey.. but if it works...
Cya, Stewart
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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: Electric Water Pump
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Sat, 19 July 2003 13:15
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The theory is much like using a thermo fan.
If it flows as much as the standard water pump, it *should* give a benefit since it can be tuned.
Having said that, it's all in theory...
We need a guniea pig...
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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 14:06
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Heya again, just thought i'd share an email i got from Ian, who has been using the EWP. (on a jag V12)
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I have had the electric water pump in since October last year. I find it is much better than the standard belt driven pump, the engine warms up much quicker, at traffic lights and in traffic I have no overheating problems.
On the freeway sitting on 120 kph the pump cycles down and maintains better engine temperatures than previously.
The only problem I have had with the electric water pump has been on the track. With the V12 sitting on 7,000 revs in second and third gear, engine gets hot. Can't entirely blame pump, I am going to change to a better radiator, and if still have problem, will use a second electric water pump for track work.
For all other uses, I find the pump pretty good, city use, and long trips, just back from a 2,500 klm trip Sydney to Adelaide, everything worked beautifully.
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We all feel for you 
