sacrificial anode for cylinder heads - Alfa Romeo Bulletin Board & Forums
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post #1 of 9 (permalink) Old 06-10-2019, 07:49 AM Thread Starter
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sacrificial anode for cylinder heads

Does anyone know where you can get these now?
International Autoparts used to sell them a long time ago before Centerline acquired them.
Thanks

'67 Duetto, '74 GTV
Past '78 Alfetta w/ TwinSpark
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post #2 of 9 (permalink) Old 06-10-2019, 09:21 AM
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You do not need them with a GOOD quality antifreeze changed every 2 years. Todays mix include anti-electrolytes that prevent electrolytic corrosion. Do NOT use plain water as a coolant!


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post #3 of 9 (permalink) Old 06-10-2019, 09:37 AM Thread Starter
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Right. I've always used distilled water mixed with good coolant.
Tap water has dissolved minerals and impurities.
I paid attention in high school chemistry class.
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post #4 of 9 (permalink) Old 06-10-2019, 11:03 AM
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I think that they were made from a magnesium/zinc alloy.

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post #5 of 9 (permalink) Old 07-24-2019, 01:55 PM
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In a race car the rules say straight water only for coolant. I cheat a little and use some redline water wetter to drop the temperature. But with straight water of any type you will get corrosion. I tried zinc but it did nothing and after a little research realized that magnesium is the correct material. In my V6 cars now I'm using these 1/4" NPT ones. I mount them into the thermostat housing. You need to inspect them yearly because they get eaten up pretty aggressively. I cut them down to size to fit.

https://www.mcmaster.com/catalog/125/579
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post #6 of 9 (permalink) Old 07-24-2019, 05:10 PM
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We used distilled water and the little bottle of Bars Leak which contains an anti-electrolyte and water stop seal lube. No corrosion.


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post #7 of 9 (permalink) Old 07-24-2019, 06:59 PM
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I think that zinc protects iron but not aluminum and that magnesium protects both of them but is used up faster. Maybe we have a chemist on here who can confirm or correct that.

Aluminum and iron dissolve at a slower rate in distilled water than in tap water but distilled water quickly becomes more like tap water when it comes into contact with air and other contaminants.

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post #8 of 9 (permalink) Old 07-24-2019, 08:05 PM
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Quote:
Originally Posted by alfaparticle View Post
I think that zinc protects iron but not aluminum and that magnesium protects both of them but is used up faster. Maybe we have a chemist on here who can confirm or correct
Magnesium is at the very bottom of the galvanic series and zinc is second to last, so they will protect both aluminum and steel
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post #9 of 9 (permalink) Old 07-26-2019, 01:57 PM Thread Starter
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I actually found one in my parts bin.
I didn't know I had one!
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Past '78 Alfetta w/ TwinSpark
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