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buztoy
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PostPosted: Thu Oct 25, 2007 8:26 pm 
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Mick wrote:
24 Oct Official
Prices Cash
Copper $77.36
Aluminium $24.75

It sure is about the dollar. It's not about thermal conductivity, and it sure isn't about weight although that will be the positive spin they might try to tell you.


point taken :wink:

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drmini in aust
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PostPosted: Thu Oct 25, 2007 8:33 pm 
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When a custom alloy one corrodes, how do you clean it out... the tanks are welded on..... :?

Ford taxis had lots of probs with the 2 core alloy rads, so Natra Radiators made a special 3 core brass/copper one to replace it. I fitted one to the EA, finally stopped it overheating with the boat on. :D

I hate plastic tanks on alloy radiators, they get hard and brittle then crack.
Our KH Laser one did anyway. :evil:

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slinkey inc
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PostPosted: Thu Oct 25, 2007 9:24 pm 
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KLAS wrote:
yes, thats true. if i say "plain water" i mean the tap water over here (has to be of much better quality than most bottled drinking waters over here)

i am not sure about distilled water without coolant, i know it will corrode less than with non-distilled water, but it still does (tested with a summer-only car). only distilled water with some coolant kept the system clean (and lubed the waterpump), but don't ask me why


Interesting.... :)

Well as with anything, distilled water is conductive, but it is a very poor conductor.

This sounds like a topic ripe for controlled testing!

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Mick
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PostPosted: Thu Oct 25, 2007 10:15 pm 
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I'm married to a chemist, she will tell you any day of the week that distilled water is like mud next to truly demineralised water they need for the chemist stuff that chemists do in chemistry labs, whatever that is (make bombs?).

Proportional with the velocity of the water past the aluminium surface I believe, perhaps the shedding of electrons taking little pieces of expensive rad with them?

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KLAS
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PostPosted: Thu Oct 25, 2007 11:02 pm 
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Mick wrote:
I'm married to a chemist, she will tell you any day of the week that distilled water is like mud next to truly demineralised water they need for the chemist stuff that chemists do in chemistry labs, whatever that is (make bombs?).


there is a difference?
i have both words printed to the same bottle. i buy "Destilliertes Wasser, chemisch rein, entmineralisiert nach VDE 0510". i would translate it as "destilled water, chemical clean, demineralised according to VDE 0510 (some german rule)".
sounds good, no matter what every single word means exactly :wink:

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Mick
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PostPosted: Thu Oct 25, 2007 11:11 pm 
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Yep, sure is if you are a chemist. I will ask her tomorrow, but guess it's to do with the contamination caused by the method of distillation or the quality of the storage prior to packaging and sale.

For 3 bucks a bottle, I don't think there would be much of a fuss if they started putting in tap water.

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Anto
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PostPosted: Fri Oct 26, 2007 1:17 pm 
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Is the reason why copper is a better heat conductor than alloy the same as why it is a better electrical conductor? Eg why we use copper wire not alloy wire.
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Mick
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PostPosted: Fri Oct 26, 2007 3:17 pm 
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No they are actually very close when it comes to conduction, and the big myth is that power line conductors are copper. Mostly the wires going past your house on the power poles are aluminium. It's cheaper up front, lighter (so you need less beefy power poles) and not that far removed from copper in the conduction stakes.

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henry the mini
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PostPosted: Fri Oct 26, 2007 4:34 pm 
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:shock: :shock:

WOW, so what do you need to put in radiator, distilled wated :shock:

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speedy
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PostPosted: Fri Oct 26, 2007 8:47 pm 
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Tap water mixed with some quality coolant should be fine. 8)

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