Aluminum radiators. Anode and ground straps. - Chevelle Tech
Heating & Cooling Heating, cooling and air conditioning

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post #1 of 13 (permalink) Old Jun 17th, 17, 2:44 PM Thread Starter
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Aluminum radiators. Anode and ground straps.

My first aluminum radiator I bought came with wire with eyelets on both sides and no inztructions. Did some research a d it's recommended to ground the radiator to the core support even though it's ground thru the antifreeze. No sweat I went and attached the so wire.
I also read where a sacrificial anode is a good idea because of the dissimilar metals. Another cheap insurance. I installed it where the drain pet cock would go.
I've done this to my Last three cars with aluminum radiators.
Anyone else doing this? Anyone not thought of this? Overkill? Jim
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post #2 of 13 (permalink) Old Jun 17th, 17, 6:38 PM
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Re: Aluminum radiators. Anode and ground straps.

I use a ground strap on both sides of my engine and a strap from the radiator to the core support. I'd rather have too much than not enough.
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post #3 of 13 (permalink) Old Jun 17th, 17, 7:12 PM
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Re: Aluminum radiators. Anode and ground straps.

I use one in the radiator and a couple in the block where the drain plugs are.

Don't buy them from the bigger parts houses, as you won't get much for your coin. I buy mine direct from Rotometals.com.

Compare the 2 below, the one from Summit is $5.71 dearer than the Rotometal, but the Rotometal item is substantially larger than the Summit one. Picture below.

There may be cheaper places for you guys to buy, but it's more limited for me in OZ.


https://www.rotometals.com/flex-a-li...c-anode-32060/

https://www.summitracing.com/int/parts/flx-32060



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post #4 of 13 (permalink) Old Jun 17th, 17, 7:33 PM
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Re: Aluminum radiators. Anode and ground straps.

Thank you for the info, have some ordered.
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post #5 of 13 (permalink) Old Jun 17th, 17, 11:08 PM
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Re: Aluminum radiators. Anode and ground straps.

I use the zinc anode rod too.Ive checked it in my app after 5 years,looks the same.
Better with,than without.
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post #6 of 13 (permalink) Old Jun 18th, 17, 7:51 AM
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Re: Aluminum radiators. Anode and ground straps.

I use the ground strap but not the anode.

Hidden under the top cover, the core support has a wire directly to the battery negative terminal.


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post #7 of 13 (permalink) Old Jun 19th, 17, 12:25 AM
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Re: Aluminum radiators. Anode and ground straps.

The ground straps will do no good, IMO. The aluminum is acting as the sacrificial anode for the iron. Grounding won't change this. Adding anodes to the radiator to corrode in place of the aluminum is the right way.

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post #8 of 13 (permalink) Old Jun 19th, 17, 10:10 AM
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Re: Aluminum radiators. Anode and ground straps.

I disagree, when you have current flowing through the coolant and hoses to ground electrolysis happens. And it is this that starts to eat away the aluminum. Grounding the radiator provides a better path for the current to flow.

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post #9 of 13 (permalink) Old Jun 19th, 17, 10:42 AM
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Re: Aluminum radiators. Anode and ground straps.

Quote:
Originally Posted by Philip View Post
I disagree, when you have current flowing through the coolant and hoses to ground electrolysis happens. And it is this that starts to eat away the aluminum. Grounding the radiator provides a better path for the current to flow.
Philip, while I follow your line of thinking, the radiator would be grounded through the mounting bolts. That is unless it's isolated. Seems like a belt and suspenders approach to grounding . The aluminum will still corrode before the iron. Hence the need for a more reactive metal as a sacrificial anode.
FYI, not trying to start a pissing match. this is a great discussion for all.

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post #10 of 13 (permalink) Old Jun 19th, 17, 10:49 AM
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Re: Aluminum radiators. Anode and ground straps.

I have one of the sacrificial rods in my rad lower tank. The rod is being eroded over the years I have had the car. I clean it off when ever i drain & refill the coolant.
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post #11 of 13 (permalink) Old Jun 19th, 17, 1:37 PM
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Re: Aluminum radiators. Anode and ground straps.

Scott just having a discussion, no measuring taking place On my car there are no mounting bolts to ground the radiator. It sits in rubber saddles top and bottom. While these are somewhat conductive the ground wire is better. I do have a threaded bung for a sensor in my radiator, if I can can find an anode that fits there one will be installed. Even if not needed why not, doesn't use any horsepower
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post #12 of 13 (permalink) Old Jun 19th, 17, 5:48 PM
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Re: Aluminum radiators. Anode and ground straps.

There are 4 grounds on my Rad

The 4 Bolts threaded from the Rad side Brackets into the Rad Support Panel
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post #13 of 13 (permalink) Old Jun 19th, 17, 9:38 PM
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Re: Aluminum radiators. Anode and ground straps.

Quote:
Originally Posted by Philip View Post
Scott just having a discussion, no measuring taking place On my car there are no mounting bolts to ground the radiator. It sits in rubber saddles top and bottom. While these are somewhat conductive the ground wire is better. I do have a threaded bung for a sensor in my radiator, if I can can find an anode that fits there one will be installed. Even if not needed why not, doesn't use any horsepower
Well this is where I put my tail between my legs. You are correct, the 68-72 have the radiator isolated, the 64-67 are bolted directly to the radiator support.

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