Electric Water Pumps

[shams]

Hi guys
I know this is my first post and i probably should have a little intro on me but am rather eager to get some questions out to a couple of forums for some feedback on this matter.

I have a little 1500cc turbo engine that is over heating at the track, i run quite a large radiator (dual pass VW radiator from a 2L) and am starting to think that the mechanical pump that was originally designed for 1.3 and the 1.5L non turbo engine is not able to flow as much as the motor need to disapate the heat. I find after say 8-10 laps of full throttle, the gauge starts to rise in a hurry and only letting off the gas brings this temperature down.

So i went out and bought a davies craig EWP, after a bit of research am starting to think i need a controoler for this and more precisely the electric version. But before i go out and buy that and install everything i just thought i would research a little more to actually find out if this is my real problem or not and then if this pump and controller will keep me content.

What do you guys think? I am thinking i might try it without the controller (just a relay) continuously on for now just to see what kind of temperature i will end up getting.

[camelotr]

If You have thermostat in the system, then running the pump continously will not affect the op. temp. as the thermostat will controll it. But running the EWP when it doesnt needed will cost You BHP.

[stevieturbo]

If its for the track, forget the controller. Just run the pump flat out.

[Tony427]

I would suggest that the radiator isn't up to the job as its for a two litre engine and a race tuned 1.5 litre turbo will be putting far more heat into its cooling system than a 2 litre road car will ever do.

Make sure that all the coolant has to go through the radiator, and not bypassing it via say a bleed tube or a heater tube. Also, make sure the radiator is ducted so that the air goes through the rad, not around it.

I had a cooling problem and thought an additional electric pump would sort it, it didn't. Turned out we had not exactly followed the coolant path that the original engine designers had spent millions of pounds developing. "What problems could one small redirected hose do ?" we thought. Turns out it trashed the water flow, but once the original flow was established the engine behaved impeccably.

Cheers,

Tony

[shams]

camelotr said:

If You have thermostat in the system, then running the pump continously will not affect the op. temp. as the thermostat will controll it. But running the EWP when it doesnt needed will cost You BHP.

thanks i am not worried about the thermostat but if the ewp will solve my problem and also that the pump wont fail due to being on all the time.

stevieturbo said:

If its for the track, forget the controller. Just run the pump flat out.

cool yeah thats what i have heard, maybe later i can buy the controller if i end up using the car on the street a bit.

Tony427 said:

I would suggest that the radiator isn't up to the job as its for a two litre engine and a race tuned 1.5 litre turbo will be putting far more heat into its cooling system than a 2 litre road car will ever do.

Make sure that all the coolant has to go through the radiator, and not bypassing it via say a bleed tube or a heater tube. Also, make sure the radiator is ducted so that the air goes through the rad, not around it.

I had a cooling problem and thought an additional electric pump would sort it, it didn't. Turned out we had not exactly followed the coolant path that the original engine designers had spent millions of pounds developing. "What problems could one small redirected hose do ?" we thought. Turns out it trashed the water flow, but once the original flow was established the engine behaved impeccably.

Cheers,

Tony

Thanks Tony

I hear you but this radiator is pretty much as large as i can fit, may be able to go fatter but honest think i dont need to go larger.

I havent changed the flow or any piping but been thinking about taking out the loop to the heater.
One other thing that i probably need to do is create a shroud in front of it to 'funnel' some air through it.

thanks

[rev-erend]

I though most racers just used a flow restrictor and no thermostat.

One less thing to fail

[shams]

rev-erend said:

I though most racers just used a flow restrictor and no thermostat.

One less thing to fail

flow restrictor ? i thought they would have run it in open position all the time ?

[JontyR]

Have you removed the original pump?

[shams]

yeah thats what i want to do, having two pumps would foo things up big time