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Electric Water Pump - worth it?

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    #61
    Matt, he hasnt been here in 12 months. I revived an old thread for an update...my bad
    I own a two and a half litre Commodore

    Comment

      #62
      Originally posted by ALLMTR
      Surely the pressure rise is from heated water attempting to expand. I wouldnt think a water pump pushing against a closed theromstat would create a lot of pressure...

      I've been wrong before tho.......1994 I think it was
      My understanding from reading what a few people in the industry have wrote in the past is that the pressure in the cylinder head is crucial for proper cooling.

      http://www.ttmtechnical.com/cooling.html

      Regardless of the radiator cap pressure, the water pump will produce 30-40psi in the engine block and head when the water is restricted by a thermostat. This water pressure packs coolant around the top of the cylinders and around the combustion chambers to carry away heat and stop air bubbles forming.

      Comment

        #63
        ALLMTR, I had problems with my original one (series 1 release about 4 years ago) where a brush broke when I disassembled it to be sure it wasn't leaking internally. I believe the original ones had issues with leaking over time, however they now use a ceramic seal which should be fine.

        My current one has been good for around 2 years, I think that was from the second series of releases.

        I thing I HAVE to comment on is the Davies Craig customer service. The original snapped brush problem - contacted them for a replacement brush (being lazy & not just finding one similar). They replaced the entire pump with no questions asked, sending a new one express post before I even returned mine.

        Then again, I had a wire for the davies craig pump controller cut & short in the engine bay which I couldn't find. Told them it appeared as though the controller was blowing fuses randomly. New one arrived 2 days later, genuinly forgot to send the original back & they never followed it up (I found it like 6 months afterwards).

        I bought mine to regulate my temps better & it does that job perfectly. Much better than the original water pump & thermostat setup could do - as a bonus it will cool much faster after sitting in heavy traffic for a short period in summer. An example of that would be dropping from around 95 to 85 degrees in 30 seconds of driving on a 28 degree day. Sure a good radiator helps, but the controller certainly seems to regulate the flow correctly - the original water pump would've taken much longer.

        PS. I pm'd Dale regarding a few things I need done with the car including a decent tune. I know he's probably pretty busy, so if I should contact u just say so
        PF Gamers List

        Originally posted by klampykixx
        if a motor has big enough injectors to run say, 7psi but only just starts to max out right on rev limit, will it run more boost lower in the revs without maxing out if you lower the rev limit?

        Comment

          #64
          Originally posted by Billzilla
          FWIW TVR in the UK also used them on the Le Mans V-12 engined cars.

          Just quoting myself, to show that they can be a good thing for a serious racer & fast car.

          Comment

            #65
            Thanx for your input, Lonx

            By saying heavy traffic, I assume a street car? How many K's have you done in the 2 years. Be careful, they have a two year warranty

            I dont work with/for Dale. I have his business in my sig as a mark of respect for the help/advice he has given me over the years...

            I'll Pm him to Pm you
            I own a two and a half litre Commodore

            Comment

              #66
              No worries, I figured it was worth adding to this thread. Had to do some reading to see I hadn't already replied!

              Yeah it was just in the old exa, moved it over to the new one (ca18det thankfully). The old one was pulled off the road about 6 months ago and the pump has really only seen about 30-40k I would think. I'm already thinking of buying a new one as I definately don't want to go back to the mechanical. A smart man would try to claim another warranty job but I think they've more than done their job with that one in the past.

              Cheers,
              PF Gamers List

              Originally posted by klampykixx
              if a motor has big enough injectors to run say, 7psi but only just starts to max out right on rev limit, will it run more boost lower in the revs without maxing out if you lower the rev limit?

              Comment

                #67
                I sent an email to DC about the suitablilty of the EWP cooling an LS1 and they have put me onto Dynamic Tuning Services in Canberra. They state that they have had a lot of success with EWP's on these motors...

                Lonx: So that is over 30000ks?
                I own a two and a half litre Commodore

                Comment

                  #68
                  Yep over the warranty period... Maybe I'll crack the brush in half & email them again? hehe j/k
                  PF Gamers List

                  Originally posted by klampykixx
                  if a motor has big enough injectors to run say, 7psi but only just starts to max out right on rev limit, will it run more boost lower in the revs without maxing out if you lower the rev limit?

                  Comment

                    #69
                    Any pics of the install?
                    I own a two and a half litre Commodore

                    Comment

                      #70
                      None on this computer... lost phone so I'll get some another time or just show you one day.

                      I was lucky enough to cut the original bottom radiator hose in the exa about 4" from the radiator side. Mount the pump there & make another cut on the hose further up, and it fits perfectly with only a few cm of play if that. Will post pics when I can for everyone else tho.
                      PF Gamers List

                      Originally posted by klampykixx
                      if a motor has big enough injectors to run say, 7psi but only just starts to max out right on rev limit, will it run more boost lower in the revs without maxing out if you lower the rev limit?

                      Comment

                        #71
                        all motor - no bull - a 10-15psi increase in the pressure in the block from a decent thermostat is fairly typical at moderate rpms.
                        John McKenzie

                        Science flies people to the moon.
                        Religion flies people into buildings.

                        Comment

                          #72
                          Originally posted by Lonx
                          dropping from around 95 to 85 degrees in 30 seconds of driving on a 28 degree day.
                          If it works so well why does it get up to 95 in the first place?

                          I don't understand what the gains you are expecting are. Sure allmtr has issues running the stock mechanical pump, but most guys have a simple, reliable, powerful waterpump already installed.

                          Port the housing a bit and stop it cavitating so much and happy days. Slow the belts down of course by using a smaller bottom pulley and your issues are fixed.

                          Anyways, each to his own.

                          Comment

                            #73
                            i like the one i have installed,
                            easy to mount
                            easy to controll

                            i also had problems with the first batch but all was rectified (even 2 years after buying the pump they replaced, i just had it sitting for a long long time!)

                            temps are stable, the pump doesn't turn on when cold, it pulses and decreases the amount of time it takes to get up to temp... so it could be a little decieving when you initially set it up (might make u think the pump doesn't work)...

                            the only downside was the temp sensor which has to be placed in the thermostat housing, it tends to leak if u dont have the rubber seal in place correctly... also the kit only includes 1 seal, which u will destroy if u remove your radiator hose.. i had this problem rectified by getting davis craig to send me about 10 seals for free!!... service is good.. give it a shot!
                            just keep one spare in your boot just in case =)

                            Comment

                              #74
                              bazeng - have you installed 2-3 additional temp probes in the head to check the temps? I'd suggest it might be a necessity for anyone going to an electric pump. If the engine is pushed close to the detonation threshold it would be critical imho.
                              John McKenzie

                              Science flies people to the moon.
                              Religion flies people into buildings.

                              Comment

                                #75
                                bigmuz, it ran up to that warm due to the driving prior to pulling out onto the main road & then being stuck in traffic. Any pump will fail to cool the car without the airflow as you know, I was merely giving an example of why I believe the pump controller regulates flow vs temperature quite well.
                                PF Gamers List

                                Originally posted by klampykixx
                                if a motor has big enough injectors to run say, 7psi but only just starts to max out right on rev limit, will it run more boost lower in the revs without maxing out if you lower the rev limit?

                                Comment

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