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| Front coolant tank (Page 3/4) |
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Lambo nut
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MAY 15, 01:34 PM
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olejoedad
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MAY 15, 03:54 PM
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Ok, recovery tank....
Based on information in the article, if using both tanksmin a system, the expansion tank on the engine should have a non vented cap, and the recovery tank should be allowed to function as designed.
Good article, thanks for sharing it.[This message has been edited by olejoedad (edited 05-15-2020).]
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olejoedad
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MAY 15, 04:03 PM
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.. [This message has been edited by olejoedad (edited 05-15-2020).]
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Lambo nut
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MAY 15, 07:23 PM
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| quote | Originally posted by olejoedad:
Ok, recovery tank....
Based on information in the article, if using both tanksmin a system, the expansion tank on the engine should have a non vented cap, and the recovery tank should be allowed to function as designed.
Good article, thanks for sharing it.
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Nowhere in the article does it mention using two tanks in a system.
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olejoedad
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MAY 15, 07:26 PM
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Next to last paragraph....
A recovery/reservoir tank can be used in conjunction with an expansion tank or can be plumbed off of a radiator that features a pressure relief.
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Lambo nut
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MAY 15, 07:27 PM
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RCR, if you have a higher pressure non vented cap on your radiator, or a cap that has no pressre relief at all, you have yours set up properly without a front resevoir according to the article even if others believe otherwise. [This message has been edited by Lambo nut (edited 05-15-2020).]
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Lambo nut
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MAY 15, 07:30 PM
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| quote | Originally posted by olejoedad:
Next to last paragraph....
A recovery/reservoir tank can be used in conjunction with an expansion tank or can be plumbed off of a radiator that features a pressure relief.
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Can be used, doesn't need to be used, so RCR is ok to remove his if he wants.
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RCR
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MAY 15, 10:15 PM
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Thanx for the feedback, guys. Not sure I have the room for the one I posted above.
Bob
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theogre
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MAY 16, 01:55 AM
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Update to my post above...
Stant, that makes caps for GM Ford and others, also make Pressure Testers and been doing that for Decades.
Current one is 12270 tester is an update to very old designs that now test to 30psi for high pressure systems.
And Stant has PDF of the manual online... (I have this tester but didn't want to type quotes etc.)
On page 3 (5 of 24 in PDF) Shows acceptable values for x PSI cap...
For 15-16 PSI cap is good between 14 to 18 PSI
If you must use two R-caps, 1 should be higher rated so only one works to regulate system pressure.
| quote | Originally posted by olejoedad:
One has to ask why Pontiac only used the front expansion tank when designing the car. |
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GM used front "overflow" tank simply because the radiator is a slow flow area making air purging very simple during normal heat cycling.
Many other cars, not just GM, have extra pressure tanks that try to do the same job. Even w/ overflow tank many are slower to purge just for size/flow reasons.
Many where done even before overflow tanks became standard...
Most cars before late '70 had no overflow tanks and expected air in the system and required added pressure tanks when radiator top was to low related to the rest of the coolant system. Many had something to give a filling guide to anyone to show the rad/tank was full w/ right amount of air in them so extra coolant won't push out on the floor, road, etc. My old Ford has a piece of metal in the upper Rad tank w/ a simple hole. You fill until that hole is full.
Overflow tanks became standard for 2 main reason: (You could get some aftermarket ones and some cars came w/ OE ones well before was standard.)
Purge system is more effective and reduces cavitation of WP etc.
Likely was EPA requirement because Ethylene Glycol is a very good poison and pollution problem.
Most people including most "Pros" call the non-pressure tanks as "overflow" tanks and don't give a F about correct tech names. And others understand that name even when someone bothers to know "correct" name.
Added Pressure tanks often get lump as Expansion Tanks regardless of tech terms.
If you think coolant filling for Fiero is bad...
Some new cars are far worse and often need special equipment to fill an empty system. Is why "they" now make "coolant vacuum fill tools."
Example: https://www.youtube.com/watch?v=_WCRcuCZI50[This message has been edited by theogre (edited 05-16-2020).]
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Rickady88GT
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MAY 16, 07:44 AM
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My LS4 swap has 3 radiator caps. Not by design, but because of the mix of different parts. The LS4 has a cap on the water pump, the surge tank has a cap and the radiator has a cap. For the system to work properly, only one cap can be functional. Otherwise air will be vented in the engine as to cools. So I chose the cap that is at the highest possible position in the cooling system to be the only functional cap. That is the surge tank. The cap on the water pump was modified to not function as a radiator cap, it is simply just a cover (no in or out venting). The front cap on the radiator is a 20# cap and the vent pipe on the radiator is plugged so not air can vent back inside the system and no water can purge out of the system. The 16#cap on the surge tank works as it was designed and is the only vent in the system.
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