It is currently Thu Jun 20, 2019 10:52 pm




Post new topic Reply to topic  [ 5 posts ] 
Electric water pump 
Author Message
Part built GTM

Joined: Tue Jun 03, 2014 7:34 pm
Posts: 71
Location: Tonbridge Kent
GTM: Spyder
Post Electric water pump
Just about to start the cooling system upgrade with the new Passat radiator and a 12 inch Spal fan. I was also thinking of an electric water pump Davies Craig ewp80 and removing the existing mechanical pump. However just had a thought that the heater won't work properly with the electric pump as it pulses and works via its controller. My simple mind would be that another small pump would need to be installed on the heater pipe work which is switched on every time the heater/fan is switched on. However sounds like more pumps than I really want. Only trying to placate my wife who likes warm feet as mot much heat seems to get to my side.

If anyone has installed one on a Spyder/Libra and a diagram is available I would be very grateful


Tue Dec 29, 2015 8:49 am
Profile E-mail
GTM delivered

Joined: Wed May 22, 2013 8:58 pm
Posts: 49
Post Re: Electric water pump
I have researched this pretty thoroughly, and am sticking with the standard pump, in a pretty much standard VVC 160. I think you have to have a very good reason for going to the extra trouble and expense of an electric pump with very questionable benefits. For one thing, you have to be sure that you will actually shift a greater volume of water through the system. You may well achieve this in other ways, such as optimising the pipework, taking care to avoid diameter changes and steps in pipe joints, which will deter good flow in just the same way as roughness and obstructions reduce gas flow in a cylinder head. On the subject of which, it would be worth cleaning up the water-ways in the top of the block and in the head itself - especially if the head is coming off to improve the head gasket situation. There is at least one extensive review in the old TGTM archive which sheds a good deal of light on the subject, also referring to the importance of persuading as much air as possible to actually pass through your nice new radiator rather than avoiding it. So far as the good lady's feet are concerned, I am given to understand that suitable boots are available, though the price may be un-palatable.


Tue Dec 29, 2015 11:11 am
Profile E-mail
Ready for SVA

Joined: Wed Aug 11, 2010 9:27 am
Posts: 433
Location: Sheffield
GTM: Libra
Post Re: Electric water pump
If you have a standard heater unit/control setup, with the direction lever set to 'down' all the air is blown into the passenger footwell as the unit is above there.

SAS

_________________
2000 GTM Libra 1.8VVC 145BHP


Tue Dec 29, 2015 11:26 am
Profile E-mail
Part built GTM

Joined: Tue Jun 03, 2014 7:34 pm
Posts: 71
Location: Tonbridge Kent
GTM: Spyder
Post Re: Electric water pump
Thanks for the sound advice. Everything on the head front and pipes is ok as I had a rebuild last summer and did all the cooling hoses etc. The Metro rad is right on the limit and as i go Continental quite a bit in hotter climes I feel the larger rad is essential. I will go with the fan and new rad and see how we go.

Re the good ladies feet, who am I to argue as to who should have all the heat!!! Our last car had no heater at all so she is being spoilt anyway.


Tue Dec 29, 2015 12:19 pm
Profile E-mail
On the Road
User avatar

Joined: Tue Oct 30, 2007 8:44 am
Posts: 658
Location: Chester le Street
Post Re: Electric water pump
The Davies Craig pump (bottom right below) works fine alongside the existing belt driven pump.

All you have to do is to fit a simple thermostatic on/off switch (top left below) to make sure that the electric pump doesn't start up until the thermostat is open.

I used one on mine and it increased the cooling efficiency markedly. It never overheated even though I was using a Laminova oil/water intercooler (centre below) so the heat from the engine oil was also being transferred to the cooing system.

Image

I wired mine (through a relay) so that it was constantly live which also prevented heat soak problems. The pump would run for a minute or so after the engine was off keeping the water circulating through the radiator.

_________________
GRP rules!


Tue Dec 29, 2015 5:32 pm
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore.

phpBB SEO