Water to air Intercoolers

[sergei]

Well. I personally can't understand you can pump the water too fast, but I'm no expert. I'd like to know how it works (just out of interest).

On pumps, I've been running an EWP80 on my cooling system for some time now. No issues, goes great.
So if you've got the money, it's something to look at.

the faster the water flows, the less chance it has to absorb any heat. Much like the inside of an intercooler - there should be pressure drop, that way you know the intake air has had a chance to touch the cooler parts of the intercooler.

Pressure drop has nothing to do with heat transfer.
Pressure drop is a side effect to greater surface area.

With heat exchanger, the more water molecules hit the hot walls (actually the molecules/atoms from hot walls hit the water molecules) the better the cooling. Flow one would think would increase the rate of such impacts.
Heat is just the velocity of the molecules relative to the mean speed of the substance.
Heat transfer in case of heat exchanger is when vibrating molecule of the hot wall transfers the kinetic energy to the water molecule. Unless the water moving close to speed of sound in water (and is cavitating), you should not have problem with "lots of flow".

Also the bigger the difference in temperature, the faster is heat transfer, and with constant flow, you cannot saturate (where there is almost no temperature difference between the hot and cold) local water reserve.

[bbq1988]

sorry for the hijack, but could someone please tell me the sizes of the Celica exchanger and the subaru exchanger? Cheers

[Mr Revhead]

with constant flow, you cannot saturate (where there is almost no temperature difference between the hot and cold) local water reserve.

so, faster may not be better. but wont hurt.
as long as the low flow still prevents saturation.
which in this application i doubt it will be an issue. having the intake manifold cold ot the touch in an AW11 seems to suggest it works very well!

[thegreatestben]

sorry for the hijack, but could someone please tell me the sizes of the Celica exchanger and the subaru exchanger? Cheers

Here ya go:





Seeing as I have both and since measuring the suby exchanger isn't *too* much smaller I might just have the suby in/out's changed to 3/4" since the ends are alloy unlike the plastic on the celica unit.

Still gonna use a different pump though.

[bbq1988]

thanks for that, im looking at using 2x 25row oil coolers (330*200*50) with 7" fans to keep mine cold. hopefully it will work

[sergei]

thanks for that, im looking at using 2x 25row oil coolers (330*200*50) with 7" fans to keep mine cold. hopefully it will work

I think subaru unit will be far better option, you will find that oil cooler is not very good to cool water due to its construction. Unless those oil coolers are just like water radiators.

[bbq1988]

thanks for that, im looking at using 2x 25row oil coolers (330*200*50) with 7" fans to keep mine cold. hopefully it will work

I think subaru unit will be far better option, you will find that oil cooler is not very good to cool water due to its construction. Unless those oil coolers are just like water radiators.

Cheers, im still looking. I Would prefer a new cooler as everything else would be new

[sergei]

thanks for that, im looking at using 2x 25row oil coolers (330*200*50) with 7" fans to keep mine cold. hopefully it will work

I think subaru unit will be far better option, you will find that oil cooler is not very good to cool water due to its construction. Unless those oil coolers are just like water radiators.

Cheers, im still looking. I Would prefer a new cooler as everything else would be new

Visit a radiator shop, find smallest radiator, they should have something that will fit.

[thegreatestben]

I tried that approach but no good, they did offer to custom make something for me. $250 at mates rates though

Enquired about my pump today, can get davies craig one for $200 brand new. Hrmm.

Probably gonna have to, nobody's gonna sell a st205 pump for cheap so $200 is sensible but $200 is hard to spend when you're a student

[Malcolm]

if you were feeling creative you could make yourself a water pump, either fit an extra standard belt driven one to the engine, or take a belt driven one and mount a 12vdc motor to it (i.e. a fan motor - this is what Davies Craig use on their pumps).

I wouldn't be too excited about the ST205 one either, I'm pretty sure they're the same as the ST185RC ones - I have one and it's heavy, noisey, and heavy.

What Davies Craig pump are you getting for $200? If it's one of those small booster pumps, I'm not sure if I'd bother because I don't think they have a flow rate that is even anywhere near the subaru/st185 unit. If it's the EWP85, then the flow will be heaps but I will warn you that I've had massive headaches with them - they are very prone to leakage in the seal between the motor and the pump unit. If it's the new EWP110 - which is completely sealed - then awesome, that's a lot of pump for $200 and will do the job perfectly.

[thegreatestben]

Nah it's only the 9002 booster pump which lists water to air as one of it's uses.

[cogent]

For my setup I will just be running two of the subaru pumps. What is the best way to run these? One just after the heat exchanger and one just after the radiator?

[thegreatestben]

Two??
One is loud enough as it is!

I would use the suby pump but It seems pointless changing to the st205 cooler just to use pumps with 5/8 fittings

[Malcolm]

Do you know what the flow specs are on the booster pump? I think I'd pick a subie pump over one of them, purely on a cost vs flow basis. Although now the idea is in my head, I'm pretty sold on the make your own option I don't think it would be too hard, and it would be more awesome

[thegreatestben]

I have had thoughts of running something off've the motor.
Would be mint If I could just run a power steering pump full of water.

I've been told this is a bad idea

[frost]

yeah that would be a bad idea, it would super pressurize the water coming out. not to mention it would die of lack of lubrication.

[Mr Revhead]

yeah two.... i ran two
because of the distance the water has to travel
i used one to pump it towards the front, then another to send it back.
not that noisy at all. in fact you couldn't hear them over the engine. maybe a little at idle

[thegreatestben]

Oh ho
http://www.trademe.co.nz/Browse/Listing ... =230578979

That could be a winner...
IF it spins, does anyone know if thats an impeller type or if it operates off've a cam?

[Malcolm]

definitely a centifugal pump, looks ideal.

[thegreatestben]

Trademe scouring ftw.
Have asked what size the in/outs are.

Fingers crossed 3/4"