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03-02-2021, 08:24 PM | #1 |
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Join Date: Dec 2013
Location: Normal, Illinois
Posts: 22
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Adding a Coolant Overflow Tank
Is adding a coolant overflow tank a good idea for my 1950 8ba?
I’ve noticed some coolant overflow loss on cold start up’s. Appreciate any thoughts on this from the group |
03-02-2021, 08:57 PM | #2 |
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Join Date: Jun 2012
Location: Long Island,NY
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Re: Adding a Coolant Overflow Tank
I have one on my '32 and one on my '46. It certainly can't hurt to install one on your 1950.
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03-02-2021, 10:10 PM | #3 |
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Re: Adding a Coolant Overflow Tank
Water expands with heat ,Most flatheads will dump about a quret or so ,its a low pressure system . Once the water temperature rises excess water will need to go out a expansion tank will capture the water then as it cools it will suck it back in,which ever way you go you will be operating with a quart or so of less water .if your radiator is restricted a tank will help to push the water through as it then would be a closed system . the engine could operate hotter and not boil depending on the Thermostat and cap pressure .
Last edited by FlatheadTed; 03-02-2021 at 10:23 PM. |
03-02-2021, 10:15 PM | #4 |
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Location: East Hartford, Ct
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Re: Adding a Coolant Overflow Tank
Have a coolant 'recovery' system on mine that requires the use of a recovery type cap that allows the return of the fluid back to the system.
You can install an "overflow" tank but it will not return overflow to the radiator.
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03-02-2021, 10:27 PM | #5 |
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Re: Adding a Coolant Overflow Tank
True ! you need the right cap
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03-02-2021, 11:55 PM | #6 |
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Re: Adding a Coolant Overflow Tank
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03-03-2021, 09:47 AM | #7 |
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Location: Dighton, Mass
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Re: Adding a Coolant Overflow Tank
Just my thoughts they did not need it when new so why now? The old rule do not fill a
model T to the top or you get it in your face when it gets to temperature and thats almost boiling....but then I have a 1950 F6 bought new Ok lately when the thermotats start to open there it goes like a gallon of nasty anti freeze all over. So it got a gallon jug tie wrapped behind the grille original pressure cap. I bought a new 4 row aluminum radiator same old thing. Why because my father kept dumping stop leak instead of repairing the radiator in the first place since I was in school and that's 55 years ago. So I bet that block has 6 inches of stop leak junk in it. And that was common back then. Engine still runs real good but only for a couple of hours before it pukes up. So someday here spring comes in June and It will get a fresh EAB 239 then I will have that block therm'o cleaned and a rebuild and put in stock. So Im just saying needing a recovery tank there is something wrong...sam |
03-03-2021, 02:12 PM | #8 |
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Join Date: Jul 2010
Location: Ventura, CA
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Re: Adding a Coolant Overflow Tank
In my mind a coolant recovery tank is a must have item on just about any engine. The problem with the pre 48 engines is that the radiator fill cap generally has no allowance in the fill neck for a pressure cap to seat to therefore any expansion of the coolant spills onto the ground.
The first step to installing a coolant recovery systems is to improve the radiator and modify it with a neck that will seat a pressure cap. Recovery tanks are very easy to make utilizing 12/18" of black 2" ABS pipe,two caps, one of which is glued on, the other is left loose. Two right angle barb/threaded 'Ell-bows, one of which is threaded into the glued on cap, the other threaded into the plastic tube, about 2" from the top. Attach clear plastic tubing to the bottom fitting, running it to the overflow neck of the radiator. attach a piece of clear tubing to the upper fitting on the ABS tube, extending the tubing down to the frame. Secure the overflow tank verticilly with plumber tape. To check the fluid level is very simple by viewing the fluid in the tubing, remove/replace the top cap to add fluid if needed. Once the system stabilizes, air is purged, adding fluid is not an everyday thing. Of course you can go to the local speed shop, spending about $100. to purchase a nice billet overflow tank. of course the Rat-Rodders like to use recycled soda, beer, etc., containers. Coolant recovery systems on vehicles became a standard item in the mid to late '60's, just as coolant in lieu of water had become a standard practice in the late 50's, early 60's.
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03-03-2021, 02:42 PM | #9 |
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Re: Adding a Coolant Overflow Tank
But that extra water above the heat exchanger isn’t doing anything to help the cooling system. And when up to temp that extra water is riding in the recovery tank where it isn’t doing anything. I don’t buy it. I don’t see how this does anything to help.
Last edited by JayChicago; 03-03-2021 at 03:08 PM. |
03-03-2021, 02:51 PM | #10 |
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Re: Adding a Coolant Overflow Tank
Recovery tanks became standard in the fifties when they filled the space available with the finned heat exchanger. Then a remote expansion tank is necessary. Our tall radiators have a built-in expansion tank. A second expansion/recovery tank serves no purpose.
I’m open to hear ideas to explain why it helps the cooling system. |
03-03-2021, 03:32 PM | #11 |
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Re: Adding a Coolant Overflow Tank
I have a small container at the end of my overflow tube, just to catch overflow so it doesn't end up all over the underside of the car, not a recovery tank. It only overflows when hot at higher speeds, and only if I have accidentally overfilled the radiator. The water level of my radiator is just below the top of the tubes the the car runs between 160 and 180 all the time.
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03-03-2021, 03:37 PM | #12 | |
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Re: Adding a Coolant Overflow Tank
Quote:
So you are saying that you never had to add fluid to the radiator or never had any come out of the overflow tube? |
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03-03-2021, 06:39 PM | #13 |
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Location: NW Arkansas
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Re: Adding a Coolant Overflow Tank
'48 F!. I used to lose coolant. Got a small recovery tank from a S10 brand x. Ran a hose from the overflow tube to the tank. My radiator cap had two seals. One at the top of the tank and one below it at the top of the radiator. Removed the bottom seal so it could transfer coolant to and from the tank. Not running any pressure and don't need to. Radiator runs full all the time. Never overheats or loses coolant.
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03-03-2021, 07:01 PM | #14 |
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Location: Ohio
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Re: Adding a Coolant Overflow Tank
Not worth making. I ordered mine at NAPA for like $12. I mounted it inside the fender. Advance Auto Parts used to sell em even cheaper, but only on-line.
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03-03-2021, 07:58 PM | #15 | |
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Re: Adding a Coolant Overflow Tank
Quote:
Never overheats. Good stock radiator in this car. |
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03-03-2021, 08:06 PM | #16 |
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Join Date: Dec 2013
Location: Normal, Illinois
Posts: 22
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Re: Adding a Coolant Overflow Tank
Thanks everyone, great feedback. Still thinking i’ll add the coolant thank.
Also meant to say once the thermostats opened that’s when i’d get some water out of the overflow. |
03-03-2021, 10:34 PM | #17 | |
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Re: Adding a Coolant Overflow Tank
Quote:
On my truck, there is a horizontal "tab" under the cap. That is the cold fill level, about an inch below the filler neck. Anything more than that ends up on the ground.
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03-04-2021, 09:48 AM | #18 |
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Re: Adding a Coolant Overflow Tank
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03-04-2021, 11:46 AM | #19 |
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Re: Adding a Coolant Overflow Tank
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03-04-2021, 11:54 AM | #20 |
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Re: Adding a Coolant Overflow Tank
Yeah, you can fill to the top of the filler and put an extra quart in the system. But when up to temp that extra quart is just riding along in the recovery tank. The capacity added is the tank itself. And coolant in the tank is not doing anything to help cooling.
Last edited by JayChicago; 03-04-2021 at 12:01 PM. |
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