Can't find a good explanation of "donor" insert to save Z Head

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Model T Ford Forum: Forum 2016: Can't find a good explanation of "donor" insert to save Z Head
Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Laughary on Tuesday, July 19, 2016 - 07:55 pm:

How would the melting of one piece of metal prevent the warping of another?

The price is fine, but how would I ever know if it works and if it needs replacing?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dennis Plank - Three Way, TN on Tuesday, July 19, 2016 - 08:36 pm:

If you are referring to the sacrificial anode to put in the cooling system, it is there to keep the aluminum head from corroding away due to the electrolosis between the Iron block and the aluminum. It doesn't hurt anything to put it in, but I'm not sure you need it if you are running antifreeze. I think the antifreeze is pretty good protection.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John T. Tannehill III, Hot Coffee, MS on Tuesday, July 19, 2016 - 08:36 pm:

It's to stop or diminish the electrolysis from eating your head by using a sacrifice piece.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Tuesday, July 19, 2016 - 10:53 pm:

It has no effect except to deposit magnesium oxide through The entire cooling system. There is not any significant electrolytic reaction between cast aluminum and cast iron. This is a case of a fraudulent useless item that all the part vendors sell because they can profit by doing so.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Laughary on Tuesday, July 19, 2016 - 11:13 pm:

Thx Royce


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Hatch on Wednesday, July 20, 2016 - 04:54 am:

FYI: If you google cooling system electrolosis you will find a lot of "stuff". Here is onehttp://www.lcengineering.com/LCTechPages/pdf/Testing%20for%20Electrolysis.pdf

Dan


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Laughary on Wednesday, July 20, 2016 - 08:45 am:

Great info, Dan. I'm learning.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gene Carrothers Huntington Beach on Wednesday, July 20, 2016 - 02:06 pm:

Well said ROYCE!
I agree and have been running a Z head since they came out with no problem.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Pat Kelly Montana on Wednesday, July 20, 2016 - 02:46 pm:

Gene, are you running antifreeze? I just put a Prus head on my roadster this winter. I'm just wondering about maintenance, coolant change out use of never-sieze on plugs and bolts into the aluminum. PK


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Laughary on Wednesday, July 20, 2016 - 02:56 pm:

After a month of cool running on water, an the installation of a Z head, today I'm draining and adding a gallon of Prestone antifreeze concentrate.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gene Carrothers Huntington Beach on Wednesday, July 20, 2016 - 05:02 pm:

I run a 50/50 or a touch less antifreeze. It's Important to use the Conventional (old green type) and not the high mileage long life new type.

A touch of anti sieze doesn't hurt on the plugs but I don't use any normally, you want a good ground which is easy as you thread in the plug.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Laughary on Wednesday, July 20, 2016 - 05:12 pm:

Thanks, Gene

I'm going with the green stuff and guessing the total coolant capacity is around 2 gallons with my new Z head.


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