Regular car coolant for PC - Page 4

http://www.atsdr.cdc.gov/substances/toxsubstance.asp?toxid=240
Propylene glycol is used by the chemical, food, and pharmaceutical industries as an antifreeze when leakage might lead to contact with food. The Food and Drug Administration (FDA) has classified propylene glycol as an additive that is “generally recognized as safe” for use in food.

I missed that.

from wiki:
In short, if you get some on your fingers and then put them in your mouth, you'll be fine. if you mix it with your orange juice, or let the dog lick up a spill, you're gonna have problems.

this might be useful - a few properties tables.
http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html

of note should be the increase in flow charts - meaning to maintain the same temperature, increase flow by x% - for 50/50 mix in a PC, you're looking at adding an extra 20% flow - so the difference can be virtually negated by turning up an adjustable pump by one setting. In actuality less than that, because I can't see a need for 50/50 mix in a computer loop.

For what it's worth, I said I don't see the benefit of using it in a water cooling loop, but I also wasn't thinking about dissimilar metals as I have done my absolute best to ensure that there is nothing but copper and brass in my loop, which are low enough on the Galvanic Index that a few drops of Redline Water Wetter should be able to prevent any corrosion.
I am a big car person, and I usually get about 30-45 track days/Autocross events in per year and I drive a very heavily modified BMW 328Ci, which I have spent huge amounts of time in optimizing the cooling system (best cooling, most reliability, and least weight). I run pure distilled water with approximately 5% more water wetter than is recommended but it cools the best. Antifreeze is not allowed on tracks, as it is extremely slippery and also bad for the environment (and a PITA to clean). I have been running without it for years, and the inside of my (custom, triple-thick) radiator is like new, as is the entire system, so the water wetter is clearly doing its job.

I am not saying that anyone is wrong to run a glycol mix in their loop, I simply think that the same benefits can be achieved with a better product that has far fewer possible downsides. I am always willing to admit when I'm wrong, so I will try using a (maximum of 90:10 water antifreeze) mix in my loop, but I don't think that it will really help, while RL WW has the ability to actually improve temps.

As to the former you're right - they do not like it when you put it on the track, but the only times I've ever seen that happen are when someone totals their car, and then there's usually oil on the ground as well. I've never been turned away from a track event for running good 'ol 50:50 in my BMW - tech usually checks over the cooling system and I figure they'd say see ya if they figured it was gonna explode all over the lovely racing surface. As for being bad for the environment, that doesn't have much to do with track vehicles - half of the dedicated vehicles don't have cats.

True, I don't run cats hardly ever, though I do have some Fabspeed 80 cell Metallic Ultra-Flow Cats for when I don't want to have the bad smell (well, others don't like the smell). It takes about 20min total to swap them out thanks to some creative engineering

Why I liked that cat.

Wife and I were in the front of the house, yard work or something, but the wife sees Buster (the cat) sitting in the middle of the road and starts calling him. I catch some movement and look across the street by the stop sign (see pic), guy walking his Irish setter. The dog sees the cat takes off pulling the lease free, the guy starts apologizing repeatedly for losing control of the dog. While this is going on Buster has never moved still in the middle of the street with his back to the dog my wife is getting hysterical and screaming to get the cat’s attention. Just at the right moment Buster turns and literally turns into a ball of claw fanged fur on the dogs head. The dog startled turns and starts yelping, Buster drops off and the setter bee lines it back to his owner. I yell across the street Sorry.

I think those two are pretty good things that would apply to even a computer.

I don't know why so much agruing over something particular to each builder.
I use a mix of 10% Car coolant addictive from Bardahl (cheap stuff) and 90% distilled water. My system runs great, rock solid and temps stay at 4-6C above the ambient temperature (and I live in a tropical country, in some regions a watercooled CPU is not only for OC-ing, but a must if you want your cpu to last longer).

I'd like to test the specifically watercooler-designed fluids, but being in brazil makes it a bit difficult:
1- Its a HELL to import anything, even for personal use
2- We don't have the fluid brands you're used to find on the shelves and online stores
3- Whenever we buy something on the web from abroad, we are charged in USD, which the current exchange rate for our currency BRL (Brazillian Real) is 1USD = 2.05BRL which doubles the cost of anything bought abroad (and there's the shipping fees that hang on the 30-60USD zone)

So yeah, considering costs, maintenance need, and the practicality of it, I'd stick with the ethylene/propylene glycol or car cooland + distilled water mix. Its cheaper, works just as good as other solutions and has a very low maintenance need.

I know my situation is pretty particular due to the country I live in, but I stick with my opinion.

Regarding the cat: That's normal, cats can be more dangerous than dogs when cornered. We had one that scared the hell of a german shepard after doing the exact same thing: Turn into a hissing ball of fluff, claws and fangs.

I woud like to do the same as where I line I can't find pc coolant and I have to order it from the US, what I want to know is what is the blending percentage like 80% distilled water 20% Ethylene glycol or what? I really need to know the best way to blend the coolant also what about the die, can I use regular die or there is something specific ?

I'd suggest either 70/30 or 80/20. that leaves enough of the good additives (anti-freeze and anti-corrosion), but without being too thick (unless you're putting it in a walk in freezer for an OC run) and while still having most of the benefits of straight up distilled water.

I have to laugh when I saw this thread I have used automotive coolant for years too absolutly no problems. No plasterisation, clouding, algae, staining or corrosion.
But I would say it might be agressive against plexiglass I am not sure but I did have a thermaltake cpu block top crack unknown exact cause but it was a first generation single fat single channel multiple S bends in it. Lesson learnt stay well clear of acrylic.
I have posted a few times in this thread;

http://www.overclock.net/t/1199158/plasticizer-problems-discussion-gallery/2460#post_19268272

People refuse to accept that anything but faulty tubing is at fault. I posted a pic of hardware store gardening grade tubing that was 5years old that was still cystal clear after 2 years use and 3 years in storage nothing more than 40/60 glycol, tap water mix.

As for water wetter I couldn't recommend it as is not a good corrosion inhibitor. The water wetter theroy works on preventing micro bubbles forming on a super hot surface ie above 120 cel this in turn keeps coolant in 100% contact with engine cooling jackets, I would be pretty sure my pc would shut down before then. Also can be agressive towards plasics.

Why are we concerned about cats opening up our computer and drinking our coolant when the truth is biocide is designed to kill bioorganisms probably deadlier than gycol by volume.

I would never hesitate to recommend glycol as a pc coolant I believe it would less than 1 degree cel difference if used at a 25% by volume ratio and up to 2 degree cel if used at 50% by volume ratio compared to straight water.