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  #16 (permalink)  
Old 10-04-2013, 10:58 AM
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This one works just fine. It doesn't hold any water but what is pushed into it by the radiator cap popping then is returned to the radiator via vacuum as the engine cools. I have it mounted on the opposite side of the radiator now, since I changed the fuel line and installed a new FP regulator but it's still operating correctly regardless of where installed:


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Old 10-04-2013, 05:53 PM
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quote : i just fill the radiator to the top when the coolant is cool, any radiator that is full will burp fluid out as it gets warm.
when the engine warms up it will burp out any expansion fluid and when it cools down it should suck everything back into the tank.

this is how I did mine, it works.
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Old 11-02-2013, 10:54 PM
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Where did you get the tank? Thanks.
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Old 11-03-2013, 06:35 AM
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take your pick


Universal Coolant Overflow Tank | eBay

http://www.jegs.com/p/JEGS-Performan...06373/10002/-1
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Old 11-03-2013, 09:26 AM
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if you can weld, mine was almost free.
one foot of exhaust tubing, with pieces of flattened tubing for the ends.


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Old 11-03-2013, 10:31 AM
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I have one of these on my Willys. At first I just filled the radiator and ran the motor untill the thermostat opened then installed the radiator cap. Then I filled the coolant recovery tank. The idea being the system would pump out any excess then seek its own level.

As the motor ran up to operating everything worked fine and the tank was about 2 inches from the bottom when cold.

Then as cruises got longer and days got hotter I began running the AC more, the day came when things got very hot. what happened was the coolant expands and pumps out more than the recovery tank can handle and eventually you are low on coolant.

To remedy this I made a 2 qt. pocket tank. It looks like a big hip flask. I attached this in the lower part of the fenderwell and hooked it up to the overflow of the recovery tank. Now I just keep adding a bit of coolant to the recovery tank untill it seeks a constant level.

What it boils down to is I think these tall skinny tanks are just too small. take a look at your CRT on your everyday car or truck. They are much larger often for a smaller motor.

Do the math PI x r* x lg. divide 231 by the result and you get how many qts your recovery system has. I have a little over 3 qts and use all of it.
My truck has almost 2 gallons.

I think the 3 in dia tank is better to start with as it has 2 qt capacity. Even at this it is still marginal....IMHO.
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Old 11-04-2013, 06:37 PM
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if i remember correctly... in spite of my crs
3'' diameter ss exhaust tube x 14'' long holds roughly 100 oz of fluid.
not sure it's ever been full of coolant.
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Old 11-06-2013, 10:07 AM
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Any recovery tank is basically an expansion tank. It is a place to have coolant expand to after you shut off the motor. You leave it empty and then when the motor is shut off after getting to operating temp,the coolant will push into the tank and then when the motor cools down, a vacuum forms and allows the coolant to flow back to the radiator to keep it at proper level.
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Old 11-06-2013, 12:29 PM
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As others have said, the end of the hose needs to be covered by coolant when cold. As the coolant expands, it will fill the catch tank, any excess being lost to the ground. As the engine cools, it draws back as much coolant as is required to replace the air dispelled. If the level drops too low in the catch tank, you will draw more air into the radiator, which is not what you need in there!
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Old 11-06-2013, 01:57 PM
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Quote:
Originally Posted by ogre View Post
if i remember correctly... in spite of my crs
3'' diameter ss exhaust tube x 14'' long holds roughly 100 oz of fluid.
not sure it's ever been full of coolant.
my bad... 100 cubic inches = 54 oz
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Old 11-07-2013, 09:02 AM
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Fill the tank with water. When the radiator overflows into the tank, the excess will drain from the tank.

Look in the tank after the engine has cooled. If the tank is empty, it is too small and the radiator is sucking air. Get a bigger tank. Or not. Some air in the system is not a big deal unless you are really marginal on cooling.
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Old 11-07-2013, 09:37 AM
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The coolant level only needs to be high enough to cover the end of the hose. It will fill and return as the system heats and cools, but only to the pickup hose level. Even on my catch cans I leave a small amount of coolant inside to make them work as a recovery tank. In mine the hose is within an inch of the bottom, so that's all I need. I have petcocks on both of mine, so I can drain any excess that might not return to the system after it cools.
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