Can't use the OEM one on the RS4 engine, but there are spare drive pulley's I can use, or I can go electric... any one 'better' than the other?
ive looked in to that my self as a comon fault with the rover V8 that iam going to put in is that there run hot
iam thinking the electrical pump my be the way to go as rigged to some type off turbo timer it could be set to run on after the engine has been turned
off alowing water to keep going round the engine un till it had cooled down preventing any heat sincking your damge
if you fit an electrical pump couldn't it alsa be wired through the thermostat like radiator fans on newer cars. You often hear these running on after stopping
Good point(s)... well made!
Cheers!
I'd have thought an electric pump is less efficient than a mechanical one (mechanical -> electrical -> mechanical vs mechanical ->
mechanical).
Also you'd need to think about failure modes - what happens if the pump fails? If the battery is low etc. Also think carefully about anything
that runs on after the engine is switched off, as not only can it drain the battery there is also safety to take into account.
Sounds like a cool idea though! 
Lots of forum chat about leccy pumps HERE. The IMOC one is interesting, seems that mounting
position and angle is critical 
quote:
Originally posted by daKlone
I'd have thought an electric pump is less efficient than a mechanical one (mechanical -> electrical -> mechanical vs mechanical -> mechanical).
Also you'd need to think about failure modes - what happens if the pump fails? If the battery is low etc. Also think carefully about anything that runs on after the engine is switched off, as not only can it drain the battery there is also safety to take into account.