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Warning !!! Don't Buy Aluminium Waterblocks - Page 5

post #41 of 44
i know what ae804 is talking about because i am an engineer, but do you know how much pressure it takes to crack that acrylic res? it requires a lot of pressure. and a watercooling setup no matter what, can not cause enough pressure for that to happen. if that was going to crack, there would of been a leak somewhere way before it happened.

there were probably small cracks unvisible to the eye, where the acrylic was weakened if he dropped it, or some how it was exposed to vibration that some how weakened it

i agree with duckie on this one. User error. may be overtightened it, or may be he was moving his comptuer and he hit something with it. speaking of which, where is the top to that res?

did he crack that also, overtightening?
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post #42 of 44
Alcohol doesn't crack plastic like that. First off, it makes it foggy. But to even get that effect you have to use 99% Methanol. Also I just read someone saying that the alcohol "seperates" from the water. This is not correct, alcohol mixes quite well with water, especially if the water is moving like in a loop. That looks to me like a way over tightend plug. I run windshield washer fluid as coolant sometimes and have NEVER had a res react to it and that stuff is mostly alcohol. Hell I ran 99% methanol this winter when I was chilling my water and it didn't affect any of the plastics I was using. Tell your buddy 1/4 turn past handtight will do ya.
post #43 of 44
Acrylic and some solvents do not mix well in certain environments. I've had solid acrylic rods shatter like safety glass when exposed to methonal and vibration together.

Looking at the radial cracks in the reservoir top, it's at least partially due to a manufacturing issue. Any drilling or tapping operation creates micro-fractures in the material and internal stresses can lead to cracking over time. If you want your acrylic to stand up, you need to anneal it properly after machining and assembly.

Also, it's very hard to over tighten a fill port to the point of cracking thick acrylic, unless the hole was tapped too small and he had to force it in, resulting in high stress loads on the acrylic.
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post #44 of 44
Quote:
Originally Posted by ae804 View Post
The green is from the copper. Copper "rusts" green, thus the Statue of Liberty is green, and pennies turn when they get really old.



The top cracked because alachol and water are of different densities. More than likely the mixture sat in the tube for so long that they separated. Once warm/hot water ran through it, it heated up the alachol, evaporating it. Once too much pressure was in the loop.... Pop!
Yes I am all to familier with what happens with copper when it starts to corrode. I have worked as a mechanic on a boat for the last 5 years. What I was saying is that its not due to copper and aluminum mixing that caused that type of corrosion. Oh and its not copper rusting, rusting is a different situation.
What caused that was using bad water and not using anytype of additives which you cant do. Plain and simple. Not unless you have a sacrificial anode like a zinc but I dont think that would work because you would still have the copper and aluminum mixing out.
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