electric water pumps

Ralphh85 · Post by **Ralphh85** » Tue Jun 10, 2008 8:39 am

anyoen usign one? or know of any good ones?

i will know soon if space is going to make me use one or not.

am i righ tin thinking some of them have a brain and dont require thermostats as they change the speed of the pump?

Ralph

and and and, my engines in the back (transvercly mounted) and the Rad will be in the front, since the car is less than a tonne i dotn see a huge amount of cooling required, do i really need a rangy Rad? or would a smaller car one do?

Post by **katanaman** » Tue Jun 10, 2008 10:20 am

Have a look at all the problems the GT40 guys have with a symilar setup and then decide if you dont need a lot of cooling. I think you might change your mind.

Ralphh85 · Post by **Ralphh85** » Tue Jun 10, 2008 11:40 am

true, very valid point.

reasonaing for not thinkign it would need much is im only upping the bhp by 20 or so, and i wasnt htinking the V8 would be much less efficient than current engine?

would having the engine int he back make much difference?

also guessing if the rad is int he front the fan will only need to be on a thermostat?

guess to be safe i should just fit the massive Range rover one!

Ralph

ChrisJC · Post by **ChrisJC** » Tue Jun 10, 2008 12:08 pm

The V8 will be less efficient than the current engine for at least two reasons:
- Frictional losses
- Throttle pumping losses (smaller engine needs more throttle, which is more efficient)

I'm sure there's more reasons.

Chris

Ralphh85 · Post by **Ralphh85** » Tue Jun 10, 2008 12:18 pm

ChrisJC wrote:The V8 will be less efficient than the current engine for at least two reasons:
- Frictional losses
- Throttle pumping losses (smaller engine needs more throttle, which is more efficient)

I'm sure there's more reasons.

Chris

i thought engines where more efficiant at low throttle openings?

it has more cylinders but it does still only have 16v, so didnt htinkt hat would make to much difference, sertainly the starter motor doesnt seem to know the difference.

well anyway will stick with the rangy rad which should solve that as it worked in the 2 tonne rangy.

any info ont he eleccy water pumps?

Ralph

Post by **katanaman** » Tue Jun 10, 2008 12:41 pm

maybe 16 valves but also 16 rocker arms and pushrods all at funny angles compared to a nice bucket and shim. Wasn't really that I was on about anyway to be honest. I was more on about all the coolant having to move around along with slow response times for thermostats and the like. Another problem seems to be temps around the engine as an engine in the back has nothing like the air an engine in the front has moving around it.

Search the forum (and the old forum)for electric pumps, its been covered a few times. Some like them some hate them and some just don't trust them.

chodjinn · Post by **chodjinn** » Tue Jun 10, 2008 4:27 pm

yeah very mixed views on the electric water pumps. I personally have a Davis Craig EWP80, which I plan on running without the thermostat control etc. to save me faffing around during the rewire (which starts imminently!). I personally haven't ran a V8 with just the electric pump - but I needed the space due to my turbo piping, plus I got it half price brand new

Only time will tell i guess. As katanaman said, plenty of opinions on old forum; some love them, some hate them!

Ralphh85 · Post by **Ralphh85** » Tue Jun 10, 2008 5:52 pm

silly question but where do i find the old forum?? i only used this one.

how much do the pumps cost which dont need a thermostat?

only one i have been able to find (and can no longer find) are the ones on ebay for £160.

Ralph

just searched for "Davis Craig EWP80" and found them by merlin motor sport, £166 for the pump, £94 for the controler, not cheap!!

Post by **katanaman** » Tue Jun 10, 2008 5:58 pm

its on the forum index page under old V8 owners forum.

Ralphh85 · Post by **Ralphh85** » Tue Jun 10, 2008 8:47 pm

found it, tho i cant find anything by searching for electric water pump, only brings up handful of posts.

someone please enlighten me with basic pros and cons?

i think the craig david pumps look the bollocks and makes since in my mind but im very open for opinions.

Ralph

Ian Anderson · Post by **Ian Anderson** » Tue Jun 10, 2008 8:49 pm

Ralph

Chris Edwards - our GT40 Enthusiast Club ex Chairman ran a 3.5 rover with a EWP solely - stripped out the main pump and had an idler pulley only. He had great success with the pump in keeping the car cool - including numerous track days (Spa included) I'm sure I could get details of the setup if needed.

And for the rad yes we run a thermostat to turn it on and off - through a relay as they draw a load of current. Most also run an override switch so keep an eye on the temp for jams etc and have the fans run constant.

For info in the GT I have a rad 12 * 24 inches purpose made ali unit with 2 high power 12inch fans. rated at about 950cfm each

I believe the Rangie unit is 16 inch and flows about 1500cfm

I am currently importing 2 bilge bay air pumps at 250cfm each to blow aor through the engine bay when in jams!

Heat builds up quick and can be a problem!

cheers
Ian

Paul B · Post by **Paul B** » Thu Jun 12, 2008 1:34 pm

Ralphh85 wrote:found it, tho i cant find anything by searching for electric water pump, only brings up handful of posts.

someone please enlighten me with basic pros and cons?

i think the craig david pumps look the bollocks and makes since in my mind but im very open for opinions.

Ralph

I have (had, sold the car now) a Davies Craig electric water pump in my RV8 powered Morris Eight. I did over 5000 miles in it without a problem. There were/are loads of posts about the subject in the forums somewhere.
Here ya go, have a browse around:

http://www.v8forum.co.uk/snitzforum/for ... ORUM_ID=29

Ralphh85 · Post by **Ralphh85** » Thu Jun 12, 2008 2:39 pm

was yours the 80 or the 110 davies pump?

all i can gather is people whohave them seem to liek them, and some others believe they dont have enough flow/presure for the job.

still doesnt seem to be much info, read allt he relivant posts there.

cheers
Ralph

v8 jago · Post by **v8 jago** » Fri Jun 13, 2008 11:17 am

I use an ewp and i think mine is a 110 BUT not 100% sure on that as i have had it for a few years now (About 5 or 6) When i run it on my 4ltr i never had a problem but since i went to a 5ltr with bigger cam and heads i can only do 7 or 8 mile before it is boiling hot...
Dont know if that is cos the jets need sorting in my carb or if the rad isnt big enough or if the guage is playing up, Even tho i have put a new guage and sender on. The pump was from demon tweeks.. Hope this is some help.. I also use it on the switch so i can control it and i use mine after about 30 secs from turning the engine on when i want it warmed up quick.....

Paul B · Post by **Paul B** » Sat Jun 14, 2008 8:45 pm

Ralphh85 wrote:was yours the 80 or the 110 davies pump?

all i can gather is people who have them seem to like them, and some others believe they don't have enough flow/pressure for the job.

still doesnt seem to be much info, read allt he relivant posts there.

cheers
Ralph

Mine was the smaller one, so an 80 I guess. I think the bigger ones only came out in the last couple of years.

When I had a problem with mine making a whistling sound I emailed them, and they sent me a new one, even though I told them I had bought it second hand, but unused, and had no paperwork for it. Good customer service attitude, I thought.

I assume you have had a browse on their web site?

http://www.daviescraig.com/main/display.asp?pid=47