Antifreeze maintenance - Page 3 - The Combine Forum
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post #21 of 42 (permalink) Old 01-22-2019, 10:22 AM
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Distilled water versus RO water aren't so much different from each other as the process used to make the water pure are different. The more pure you make water, the more aggressive it is. In essence, pure water is a near perfect universal solvent. So yes, it would begin to dissolve steel from a steel tank. In research (NOT commercial or production of commodity) very specialized highly controlled distillation of water has made water so pure they were able to begin to detect molecules of the pyrex glass containers in the water! It somewhat depends on what impurities are in the water to begin with and what ones you want to take out. Getting a distillation system to work anywhere near as well as that one in research is very expensive, and operating an RO filter becomes the better solution. RO does a better job on certain things like chlorine that tend to get carried away in the steam in distillation and therefore condense with it and remain with the water.


Having said all that, once you mix it with the antifreeze, it's non pure water anymore and shouldn't be an issue. You want to start clean. The corrosion inhibitors will do their thing, the water doesn't remain as pure as right out of the RO system. Now if you put straight RO in your rad, you wouldn't want to leave it for long.


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post #22 of 42 (permalink) Old 01-22-2019, 10:30 AM
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Anyone ever use Evans waterless coolant? Supposed to last forever.

I put it in an old pickup I rebuilt. Pretty expensive to do a tractor or large capacity cooling system. Touted as reducing cavitation on the cylinder cooling jackets.

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post #23 of 42 (permalink) Old 01-23-2019, 11:31 AM
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Anyone ever use Evans waterless coolant? Supposed to last forever.

I put it in an old pickup I rebuilt. Pretty expensive to do a tractor or large capacity cooling system. Touted as reducing cavitation on the cylinder cooling jackets.
A friend has an older Volvo single axle truck that was always running hot. Problem #1 fixed by getting the rad totally cleaned. Then he added Evans because it is more efficient at carrying heat away than ethylene glycol. That truck runs cool now. A 50/50 mix of ethylene glycol is only 90% as efficient at removing heat as pure water. But you need the corrosion protection so can't do that. Anyone know about Dowtherm? It has been around since the 60s and is not glycol. What was it's claim to fame? Not compatible with glycol again.
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post #24 of 42 (permalink) Old 01-23-2019, 11:37 AM
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A 50/50 mix of ethylene glycol is only 90% as efficient at removing heat as pure water.
I was just going to ask that question, thank you TA.
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post #25 of 42 (permalink) Old 01-23-2019, 11:59 AM
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Just don’t do the Evans.
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post #26 of 42 (permalink) Old 01-23-2019, 01:14 PM
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I was just going to ask that question, thank you TA.

I was always under the impression antifreeze was better at cooling, but alas at 200 degrees it has 17 percent less heat holding capacity then pure water.

Thx Transaxial!
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post #27 of 42 (permalink) Old 01-23-2019, 01:54 PM
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I was always under the impression antifreeze was better at cooling, but alas at 200 degrees it has 17 percent less heat holding capacity then pure water.

Thx Transaxial!
Antifreeze has a higher boiling point. At my university tractor club we had a case that would boil off the water during parades but antifreeze was fine. Tough to cool anything after it evaporates.
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post #28 of 42 (permalink) Old 01-23-2019, 02:00 PM
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Just donít do the Evans.
Gonna make us guess why?
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post #29 of 42 (permalink) Old 01-25-2019, 05:25 PM Thread Starter
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Test strip were fairly easy to find, found an Auto Value store selling packs with 4 strip in each and the reference card. The QSX looks fine but the 350 Cummins in the old truck needs some supplemental. Looks like I will put on a new filter which would be the WIX 24071 with one unit of SCA in it. Since my test strip says 1 pint /4 gallons and I guess at 12 gallons cooling capacity I should add two more 1 pint (473 ml) bottles of SCA and then run the truck for a few days then retest.


So another question, I see reference to SCA-2 and SCA-4. I think - 4 was mentioned for Cummins engines but are we talking 40 year old ones or say new generations?
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post #30 of 42 (permalink) Old 01-25-2019, 06:21 PM
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Pretty sure I have 4 different types of coolant on the farm, sure wish they would standardize things and leave them alone...



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