Kodiak
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| posted on 27/1/06 at 11:37 AM |
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Electric waterpump
If you are going with an electric waterpump you should get the full set up. There are 3 Davies Craig pumps now, a small "booster" pump
more suited to small low performance engines, the 80 and the new 110. With your engine size the 80 would be the way to go and make sure it is the
generation 3 with the ceramic seals. The water pump controler is worthwhile as it helps to ensure a long engine life and low power draw. Manual
control does not give you the "pulse" function or engine off cooldown. Have a look at the Davies Craig web site and email them, they are
very helpful. One last thing, watch out for pumps on e-bay etc as many are the older generation 1 and 2 units, aparently the new ones last well over
2000 hours, doesn't sound like a lot until you consider that 2500 hours is the expected life of a large bike engine in a bike and probably well
over a bike engined car's rebuld life.
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garyo
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| posted on 29/1/06 at 12:38 PM |
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My car has a mid engine'd CVH which I'm about to replace with a Zetec (Series 3). The car currently has a Davies Craig pump because the
last owner had coolant circulation issues - I think this is more down to the awful bends in some of the coolant hoses, rather than the CVH pump not
being up to the larger volume of water.
What I'd like to do is disconnect the Zetec pump (by rerouting the aux belt), and let the electric pump do *all* the pumping. So my questions
are
1) will my EWP 80 (20L-80L / min) be up to the job
2) will the vanes on the Zetec pump inhibit the flow - do they need to be removed?
Cheers
Gary
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stevebubs
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| posted on 29/1/06 at 01:41 PM |
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1) Don't know
2) Yes
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Kodiak
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| posted on 29/1/06 at 02:20 PM |
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You will need to remove the impeler replace the entire mechanical pump with a blanking plate / dummy pump (sorry, not familiar with the Zetec). As for
the size issue, these (80L) are being used for small (5 litre) V8's in Australia with sucess so 2 litre should be no problem. The 110 litre
version of the pump last time I checked did not have a dedicated controller so ironically is probably going to be less efficent despite it's
higher flow rate. BTW, people I have spoken to running this pump swear by using the optional controller . I am not on the road yet so can't
confirm the claimed power gain and improved temp stability.
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garyo
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| posted on 29/1/06 at 04:04 PM |
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That's my feeling too (take the impeller off and leave the rest of the pump as-is, but with no belt.
The DC installation sheet says you should either
a) remove the impeller (and leave belt as-is)
b) reroute the belt, to miss off the pump
so the installation manual seems to be focussed on avoiding the wasted pumping losses, rather than inhibiting flow, and offers no guidance about
whether to bother removing the impeller for flows sake.
I have the thermostat controller, rather than the variable speed controller :-(
Gary
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garyo
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| posted on 29/1/06 at 04:10 PM |
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I should have added - because I'm not 100% sure that the electric pump is up to the job, reliable, etc, it'd be handy to keep the
mechanical pump on one piece so that I can revert back to it if needs be. I guess the impeller will need to be destroyed to get it off, being some
silly interference fit.
PS sorry for this being in the BEC section - I searched the archive then replied to this thread without looking.
Gary
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stevebubs
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| posted on 29/1/06 at 05:10 PM |
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quote:
Originally posted by garyo
I guess the impeller will need to be destroyed to get it off, being some silly interference fit.
Yep....
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