CageyH Posted April 19, 2019 Share Posted April 19, 2019 I am interested in fitting an electric water pump to my car to help avoid the heat soak after shutdown. I find that when I get back from a blat, and have driven my car into the garage that the cooling fan is running. I am reluctant to turn the engine off until the fan stops. An electric fan with controller will take care of this problem, but I want to retain the mechanical fan. How does the electric fan increase the flow rate to the figures given by Davies Craig when a stalled mechanical pump is in the circuit? I assume for my needs that the smallest model (EP80) is sufficient for my needs. I need to work out where I have space to fit it, as it should go in the bottom hose, between the original thermostat location and my PRRT. Link to comment Share on other sites More sharing options...
elie boone Posted April 19, 2019 Share Posted April 19, 2019 If you want to retain the mechanical water pump then i would plumb the electric water pump into the heater circuit as this sort of bypasses the main circuit. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted April 19, 2019 Area Representative Share Posted April 19, 2019 I would agree that an electric pump should only supplement and no replace your collant pump.The issue, as I understand it, is uneven cooling and the existence of hot-spots within the engine. By pumping the coolant around the block, cooling will be much more even. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 19, 2019 Member Share Posted April 19, 2019 An electric fan with controller will take care of this problem, but I want to retain the mechanical fan. How does the electric fan increase the flow rate to the figures given by Davies Craig when a stalled mechanical pump is in the circuit?Do you mean "pump" rather than "fan" in this?Jonathan Link to comment Share on other sites More sharing options...
revilla Posted April 19, 2019 Share Posted April 19, 2019 The mechanical pump is only a centrifugal impeller; I doubt it will prove to be a major obstruction to flow when not running. Link to comment Share on other sites More sharing options...
SM25T Posted April 19, 2019 Share Posted April 19, 2019 I did think that .... it doesn't fill the housing, so water should be able to pass ok. Link to comment Share on other sites More sharing options...
CageyH Posted April 19, 2019 Author Share Posted April 19, 2019 Yes, I meant pump. So an electric pump, and controller to run both the pump and fan. Basic kit cost is about €350. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 19, 2019 Member Share Posted April 19, 2019 ThanksJonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 19, 2019 Member Share Posted April 19, 2019 Have you got Regin's notes?Jonathan Link to comment Share on other sites More sharing options...
CageyH Posted April 19, 2019 Author Share Posted April 19, 2019 I have now. Thanks. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 19, 2019 Member Share Posted April 19, 2019 :-)Full search of the archives.Jonathan Link to comment Share on other sites More sharing options...
rj Posted April 19, 2019 Share Posted April 19, 2019 I've just updated the thread JK referred to with an image of the eninge on the workbench as I am in the grage at the moment. Here it is as wellI have a PRRT and no heater. The original water pump is still there, the electric pump is controlled by a thermal switch - with a boss brazed into the water rail. Kicks in at 80 out at 75. Works a treat. Link to comment Share on other sites More sharing options...
CageyH Posted April 19, 2019 Author Share Posted April 19, 2019 How easy do you think it will be to fit when the car is in the chassis, with throttle bodies etc. already installed? Link to comment Share on other sites More sharing options...
rj Posted April 19, 2019 Share Posted April 19, 2019 I did it like that initially. Quite easy to do from underneath.Making up the tube with the correct fittings will not be easy though. Best to be done on a spare block (which I did) Link to comment Share on other sites More sharing options...
CageyH Posted April 19, 2019 Author Share Posted April 19, 2019 I was thinking about adding it in to my existing Pipework, rather than making something new up. Link to comment Share on other sites More sharing options...
rj Posted April 19, 2019 Share Posted April 19, 2019 You can just replace the J-shaped hose with two straight pieces and place the pump on the chassis just in front of the pedal box/footwellShouldn't be hard; only obstructive item is the steering column Link to comment Share on other sites More sharing options...
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