Bullet Bob wrote:

One connection will puke the overflow if the tank becomes over full.  the other tube connects to the overflow outlet below the rad cap.  I had...or maybe have...one of those when I was running the 20" copper rad in the 66.  I think the system had other issues since it would overflow enough from the rad to overflow the tank.   If you have every thing good; spring in the lower hose, good fan clutch, proper stat, good fan with proper shroud, you probably will be okay with that one.  Or, just leave the coolant down an inch or so in the rad and let it be it's on recovery tank.  Since I went to the aluminum rad and put the spring in the lower hose....and made a larger recovery tank, it hardly moves any coolant at all.

​OBTW:  The tube that pukes the overflow from the recovery tank is the one that goes clear to the top of the tank.

​BB

    Thanks for info BB.  So if I keep the antifreeze a inch below on my radiator do I cap the nipple coming out of the radiator or run a hose down to the ground?   I switched radiators and went with a 5.0 Radiator and hoses.  I didn't put the spring in  this time around.  Thought about it though...LOL   Thanks Steve
 

Steve69 wrote:

    Thanks for info BB.  So if I keep the antifreeze a inch below on my radiator do I cap the nipple coming out of the radiator or run a hose down to the ground?   I switched radiators and went with a 5.0 Radiator and hoses.  I didn't put the spring in  this time around.  Thought about it though...LOL   Thanks Steve
 

I was having heating at speed and the spring in the lower hose cured it...hose collapsing.  If you aren't having that problem you probably don't need it.  I always use a recovery tank but MS says, and he is correct, that if you leave expansion room in the rad, you don't need a recovery tank.  You will want to have the hose from the nipple below the cap running down below the rad so that if it gets overly hot it won't puke coolant all over your pretty engine.

BB
 

If the coolant level is kept at the proper level an overflow tank is not really a necessity.
 That being said I made one anyway.
 A simple 2" aluminum tube with two pieces of 1/4 inch tubing and a billet cap with an "O" ring seal which serves as a retainer.

Thanks for the info and great pics!   Steve

TimC wrote:

Another thing to consider is use of the car.  Our 66 will see some autocross time, and maybe a little track time.  Tech inspections tend to favor a "closed" coolant system to prevent the puking of coolant on the track.  The overflow items pictured here are not closed.

 
Tim, there are no closed cooling systems. Every coolant recovery tank has a vent. The one in question just runs the vent tube out the bottom of the container for looks. I suspect your tech inspectors are looking for a "catch can" to prevent direct dumping of coolant on the track.

Last edited by Hornman (3/07/2017 7:41 PM)

my question is...what are the 4 rivets for?...I thought it would just bolt up to the side of radiator...?

Steve69 wrote:

Looking at a different overflow tank that doesn't use much space.

Just wondering what are the 2 connections below on the tanks.  I know one comes from the top of the radiator down the to tank.  What is the other connection for?

Thanks Steve

Steve69 wrote:

Looking at a different overflow tank that doesn't use much space.

Just wondering what are the 2 connections below on the tanks.  I know one comes from the top of the radiator down the to tank.  What is the other connection for?

Thanks Steve

 
That’s the exact tank I use . I do wish it could hold a bit more but I like the looks and it functions

The rivets are to attach the tabs to the car, the tabs to attach the tank to if there is no convenient place. One tube is to attach the tank to the overflow of the radiator and the other tube is now the new overflow and vent. If your radiator cap is working properly your radiator will always stay full if your cooling system is working properly.

u got it correct.. the other will just drain to the ground if the tank is full...if you open the cap u will see a long tube inside that almost reaches the top.....that would be your drain..just connect a short hose to it

Gaba wrote:

Steve69 wrote:

Looking at a different overflow tank that doesn't use much space.

Just wondering what are the 2 connections below on the tanks.  I know one comes from the top of the radiator down the to tank.  What is the other connection for?

Thanks Steve

 
That’s the exact tank I use . I do wish it could hold a bit more but I like the looks and it functions

Hard to say without a picture, but I would think that you could bend up some simple brackets to place it out of interference, and still use common mounting hardware.  Very little on these old cars is plug and play.  There's so much stuff on my car I've made at this point I've lost track. 

I was able to mount to next to the radiator its a little crooked but it think im the only one that can tell lol...now im gonna turn my old platic one into my windshield wiper fluid tank...just gotta buy all the stuff for that now

Rudi wrote:

Steve said.
quote
Nice fabrication work on those billet brackets.  They should hold that tank to that flimsy piece of sheet metal on the side of the radiator with strength to spare!
quote

 Thats the old set up Steve, before the aluminum rad install. The new set up is a bit more substantial as the billet bracket is sandwiched between the front and rear rad sidepanels.
  With the new rad at the proper level I have never seen any overflow in the tank. Rules are rules so if the sanctioning body requires them you gotta have one but for street use I don't know if the commercially made ones are worth the money.

 

 

I like this picture with that brand new radiator ! all is clean and sharp !  Seems has same dimension as old one.
Does it work better ?  Do you drive without temp issue ?
Aluminium 3 or 4 row ? 
thanks !