Radiator Overflow Tank

[MikeGriese]

I'm "peeling off" the rubber peel coat paint behind all 4 wheels and recoating with it. After about 4 years (~4,000 miles) this stuff did a great job protecting the lower paint from stone chips.

Are you sure you picked the correct forum for this post?

 

[Cleveland Crush]

Are you sure you picked the correct forum for this post?

Oops, my mess up!

 

[Steve1973M1]

Hi All,
Cleveland Crush where did you get that overflow bottle?
As far as the systems go the best would be above the radiator with a portion of return heater hose running to and from it with a 13-16lbs cap. ( maybe above evap tank) You would just put a cap for filling purposes on radiator. This would give you an air gap in tank, just like the old radiator in the mustang and the brand new system. Look at new mustang degas tank stuff. Its just an Idea I have not tried it.

 

[Steve1973M1]

Hi All,
Some more info.

 

[Cleveland Crush]

Hi All,
Cleveland Crush where did you get that overflow bottle?
As far as the systems go the best would be above the radiator with a portion of return heater hose running to and from it with a 13-16lbs cap. ( maybe above evap tank) You would just put a cap for filling purposes on radiator. This would give you an air gap in tank, just like the old radiator in the mustang and the brand new system. Look at new mustang degas tank stuff. Its just an Idea I have not tried it.

Purchased the return bottle at Autozone, about 5 years ago. Note: The lower Black marker line is my cold fill level, the upper Black line is about the level when at operating temperature, upon cool down of course it returns back to the lower level.

 

[Steve1973M1]

Is this it?
Dayco DOTUN10 Universal Overflow Tank
https://www.ebay.com.au/itm/256068669666Thank You

 

[Cleveland Crush]

Is this it?
Dayco DOTUN10 Universal Overflow Tank
https://www.ebay.com.au/itm/256068669666Thank You

That Dayco looks mighty close to what I have Steve but not exact (it looks like it will slide into the fender extension space fine). No name on mine to pass on to you.

 

[MaddMike]

I want to add a radiator overflow tank. I know in years past they had a petcock for drainage. But everything I see has a vacuum system moving coolant back and forth. My question is, does that concept work on our old radiators and caps? If I connect to overflow tube to a tank will it pull back and forth or just be a reservoir for overflow?

I added the overflow tank. It was quite easy and I found what I think is a good sized, small tank with a bracket already attached. I got a angled piece of metal, cut, bent & drilled it which was the most laborious part. I used a threaded hole already present. It functions well. Here is the step by step if anyone is interested.

 

[basstrix]

Looks good. I like the form factor and location you chose.

 

[tony-muscle]

Agree with location. I think some horns are located in that location, though. At least mine is.

 

[mrgmhale]

There are a lot of choices re: what kind of coolant recovery (overflow) container to use. I decided to use the stainless steel design tank from CJ Pony Parts. In a post earlier in this thread 73MustangCoupe referenced me and provided a link to my YouTube video showing how I installed the stainless steel recovery tank on our 73 Mach 1, In the video description I provide info re: what parts we used. Although 73MustangCoupe provided the link already, I offer it again as a matter of convenience:

https://www.youtube.com/watch?v=lYzThkQ8qgQ


I previously installed an overflow tank for coolant on our 73 Mustang Convertible, as shown in this YouTube video:

https://youtu.be/D7TvjP1FknE


I have found the stainless steel cylindrical overflow tanks to be sufficient in size. But, if you want to have a container with high capacity there are several suggestion in this thread that look like they could work nicely. For me, the capacity our tanks have are plenty adequate, and I like how they look.

 

[Steve1973M1]

Hi all,
Why I like Degas system is: the air can compress area before it pushes additional venting gasses out on the top of it. It holds extra coolant that would overflow but keeps running pressure lower. In a bladder system the water expands and has no where to go but the overflow tank. The only spring in the way is the hoses till pressure relief is reached. In a Degas system Boyles gas law takes effect.
Compressed Air - Storage Volume
The storage volume for a compressed gas can be calculated by using Boyle's Law pa Va = Pc x Vc = constant. Or
Va = pc Vc / pa which means for example a 1 cubic foot container Va= 16psi (radiator cap pressure) x(1x1x1)/14.7psi( 1 atmosphere). This equal 1 cubic foot of space air will compress to 1.1 cubic feet. This is why hot and cold levels are close in a degas bottle. I have attached a reference.
Va = cubic area under pressure
Pc = pressure psi
Vc= cubic container volume (means to the third power or the length x width x height)
Pa= 1 atmosphere (will be different on top of a mountain)
Its quite a gas spring, thats why they gas inside of shocks.