Davies craig electric water pumps & electric booster pumps

Before I go to Winton on the 11-12th Aug to the All Triumph Challenge I will have one fitted to my Stag. Wish I had done this 5 years ago.

Groges H.: Hi All, I set this up in my Red Stag a couple of years ago, works very well. Extra pump is needed because the cooling pump only moves as it is needed, on cold days, when you need the heater, cooling pump is barely moving.

John B.: Greetings all, We endorse Cullum D.’s comments below in that our EWP Combo Installation Instructions state that, 2 x 5mm holes can be placed in the thermostat plate, viz, In some climatic conditions, you may need to reinstall the engine’s thermostat in order to gain/retain heat in your vehicle’s engine. As we outline in the Installation Instructions, you will need to drill 2 x 5 mm holes in the thermostat plate or remove the entire centre should you reinstall it. – I wish to emphasise we did have some issues with EWP Combo installations in Norway and northern England during their last winter that necessitated we issue these notes and it fixed the problem. We appreciate this action is not always possible as some of you have eliminated the thermostat housing – hence the installation of either the EBP15 or EBP23 Electric Booster Pump to your heater system. I trust this information, coupled with the advice on the placement of holes or removing the thermostat centre assists you all with the over-cooling/lack of suitable temperature situation.

Groges H.: it all depends on how you have set up the electric water pump. The ideal way is to get rid of the thermostat and the pump runs on temperature control, this means the water circulating controls engine temperature. This is what happens with a thermostat but the mechanical water pump still does the same amount of work and uses power ( and fuel )all the time and the thermostat just restricts the water flow. When the electric pump runs on temperature control it only uses the amount of power necessary to cool the system hence this system uses less power ( fuel ). However, talking about the heater, this runs on the flow from mechanical water pump. Hence if we get rid of the flow from the mechanical pump, we need to put in a special flow for the heater. Putting in a dedicated pump for the heater means it only runs when you need heat for the heater. Now the advantage of this is from only after a few minutes of the engine running you have hot water for your heater all separate from demands of the thermostat, radiator, motor, etc. The heater pump inlet and outlet must be in the engine side of the cooling pump inlet/outlet. A bit more complicated but a far supra system than the original. Get it right and keep WARM!