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Viscosity vs. Cooling Capacity vs. Corrosion (long)
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Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Sat, 16 Aug 2014 07:09:34 Share Post by Email
In Reply to: mixtures, saabsince 93b [Profile/Gallery] , Fri, 15 Aug 2014 19:14:42
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Higher percentages of glycol result in higher viscosity, for less flow through the engine, and result in a lower specific heat in the mixture. That means the engine might run hotter, depending on the amount of excess cooling capacity in the cooling system. OTOH, the higher concentration of inhibitor and lower conductivity in the system (glycol is like an oil that is soluble in water and hence has lower conductivity)means less corrosion. The higher boiling point of a 70/30 mixture can result in less chance of nucleate boiling in the head, which can cause what's called "erosion corrosion" and which is suspected by some (including a boiling heat transfer specialist from Babcock in Wilcox in the 1970s) as the cause of "B motor" heads cracking (something which he had the dubious "opportunity" to examine first hand). But that's not something the 16 valve motor is known for.

There is the trade off from a technical perspective.

Digression: Me, I always used 2/3 to 1/3 glycol to water before the 9-5, primarily for less corrosion, used "American" style coolant, and changed every single year. My '91 9000 was the only one of the bunch that tended to run hot, which I cured by replacing the 180/200 fan switch (located at the coldest part of the radiator) with a 160/180 unit that Audi specified. Note that the 9000 had a 180 thermostat. I suspected that Saab spec'ed the fan switch to make sure the thermostat was always full open from May to October, thus extending its life. In '02 I had the opportunity to tour the GM Desert Proving Grounds near Phoenix. The test drivers told us that when they first received Saabs, there were a lot of overheating problems.



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