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PostPosted: Sun Sep 06, 2015 8:30 am 
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Joined: Sun Jun 27, 2010 11:29 pm
Posts: 101
Location: West Hartford, CT
How do you assess the corrosion resistance of ethylene glycol as a function of how much water you add? For example: if you do 50/50 does that have twice the corrosion resistance of 70/30? Or does going to 70% water cut back the corrosion capability 3-4 times?

This has become a big deal to me as I've struggled with some corrosion related troubles on my Z32 at the coolant outlet pipes which come as a result of pitting on both the aluminum and steel hardpipes.

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2018 project: Replace alternator (don't buy Pep Boys alternators)
1995 TT White Z32 - The car is driving again!
1993 NA White Z32 - sold 6/2011


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PostPosted: Sun Sep 06, 2015 1:34 pm 
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Joined: Sun Jun 27, 2010 11:29 pm
Posts: 101
Location: West Hartford, CT
As I'm digging into this I found a decent reference explaining coolant fundementals:
http://www.machinerylubrication.com/Read/841/coolant-fundamentals

This stuff is more complicated than I recognized at first. I'm not looking to become an expert here, just recognize what it takes to best maintain the coolant system and avoid the types of problems I've had to deal with over the past month in the future.

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2018 project: Replace alternator (don't buy Pep Boys alternators)
1995 TT White Z32 - The car is driving again!
1993 NA White Z32 - sold 6/2011


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PostPosted: Mon Oct 19, 2015 1:09 pm 
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Joined: Mon Jun 30, 2008 2:16 pm
Posts: 1180
Location: Ansonia, CT
You probably have your information by now, but since I just read your message and looked at your pics, I find it interesting that you don't seem to have the corrosion "inside" the pipes in the flow path, only where the clamps used to be. You might try a special grease on the hozes before installing them. Try to place the hose clamps near the end lip of the pipe so little if any stagnant coolant collect in the "dead zone".

I would stick with a 50/50 mixture. I now buy the premix which is supposed to have the right mixture and pH. My 71 Z pipes, radiator and water channels still look really good.

Cheers :idea:

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