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Relocation of radiator overflow / expansion tank (stock 86 GT) by Ponnari
Started on: 09-26-2014 05:11 PM
Replies: 12 (426 views)
Last post by: Ponnari on 09-29-2014 02:23 PM
Ponnari
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Report this Post09-26-2014 05:11 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hello everyone,

I'm in the process of adding a vent and louvers to my hood for better cooling. Problem is that the overflow tank for the radiator is in the way. Question is, does it matter on the tanks height location (in relation to the radiator) of the overflow tank? I plan to relocate it (or something similar to it) underneath the right front headlight assembly (where some people move the battery to).

Anyone see a problem with it functioning correctly in that location?

Thanks in advance for the input

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Gall757
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Report this Post09-26-2014 05:28 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
You can put it anywhere you want as long as it is in the same vertical dimension.... no lower than it's present position.....maybe a little higher would be OK, but the coolant needs to flow back into the radiator as the car cools.
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Ponnari
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Report this Post09-26-2014 05:38 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks "Gall757" That is exactly what I was thinking, so I guess I can't locate it under the headlight like I planed

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olejoedad
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Report this Post09-26-2014 06:54 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
The coolant does not gravity flow back to the radiator, it is pulled in by suction.
With that said, it still needs to be at the same height as it is now...
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theogre
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Report this Post09-27-2014 11:34 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
You can move it but....

Keep in mind that liquid always seeks level.
Lower overflow/expansion tank can cause big problems when rad cap etc have failed.

Fiero's big issue is Radiator Cap and expansion tank are lower then engine. Is why many have problems using wrong rad cap. Many have found they have overflow the expansion tank when engine cold, even when engine isn't run, and have wrong rad cap. The WP and other seals is made to keep pressure in but often fails on any coolant vacuum, like when you park nose down on small incline and have wrong cap. Even in level ground Coolant can pull some vacuum when use wrong cap or rad cap seal/valve have a slow leak.

See my Cave, Radiator Caps

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Raydar
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Report this Post09-27-2014 01:32 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have an engine swapped car. Since I don't have the air filter canister any more, I moved my overflow tank to the back.
It one of the favorite mods I've done to my car.

To do it, you'll need to add a fill adapter and cap, in the rear. Move your normal non-vented cap to the rear, and use a 20 lb cap in the front.
Several sizes of overflow bottle are available at the parts stores.
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cmechmann
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Report this Post09-27-2014 08:38 PM Click Here to See the Profile for cmechmannClick Here to Email cmechmannSend a Private Message to cmechmannEdit/Delete MessageReply w/QuoteDirect Link to This Post
Raydar do you have any issues with the radiator collecting air at the top?
I have a pressurized reservoir in the back from a Saturn L/Chevy Cavalier. It has the vented type screw down cap with large hose at the bottom that I T'd into the input water pump heater hose and the small tube to the top that I tapped out the stock 3800 II SC thermostat housing and connected to that. So I fill with the front cap off, till radiator fills, Cap that off. Start it up and fill from the rear reservoir. I have the full mark even with the highest point that coolant would be in the throttle body. I have no issues with "burping" the engine. The only reason I left the 16lb cap up front is to make sure air burps out when hot and is topped of by itself when it cools. I think I have a small issue with the 2 reservoirs swapping levels back and forth. The front fills a little after driving, then the rear fills a little back up after cooling down. Makes sense if the front cap is a little weaker than the rear cap.
If you have not had any issues with collecting air, I will just put a stronger cap up front and do away with the front reservoir.
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qwikgta
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Report this Post09-28-2014 09:50 PM Click Here to See the Profile for qwikgtaClick Here to Email qwikgtaSend a Private Message to qwikgtaEdit/Delete MessageReply w/QuoteDirect Link to This Post
what kind of vent/scoop are you going with? I went with "Tha Driver's" hood scoop and you don't need to relocate the overflow tank. I had the same questions that you have, and could not find the best answer, so I went with his scoop.

here is my thread http://www.fiero.nl/forum/Forum1/HTML/086123.html

Rob
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Ponnari
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Report this Post09-28-2014 11:04 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
"Raydar" that is a great idea! Thanks.

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Ponnari
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Report this Post09-28-2014 11:15 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks Rob. I was designing my own scoop that was when I ran into clearance problems with the tank.

I really like the one you did in your link. I think I might just go that way since it clears the tank and would save me some time.
How much is that scoop?

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"Because in a slit second, It's gone"

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Report this Post09-29-2014 10:53 AM Click Here to See the Profile for qwikgtaClick Here to Email qwikgtaSend a Private Message to qwikgtaEdit/Delete MessageReply w/QuoteDirect Link to This Post
check "Tha Driver" web site. yes, its Tha not The. Was not much, I want to say under $200. You can see from my thread it was very easy. It was the first time I ever did that kind of work. HK has a few diff ones too. I like the "mustang twin scoop" that he created after I bought mine, I wish he had it when I was looking, I like it more.

Rob
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Tha Driver
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Report this Post09-29-2014 12:11 PM Click Here to See the Profile for Tha DriverClick Here to visit Tha Driver's HomePageSend a Private Message to Tha DriverEdit/Delete MessageReply w/QuoteDirect Link to This Post
It's $170 shipped for all my hood vents (I make 3 different ones).
Custom Fiberglass Parts
~ Paul
aka "Tha Driver"

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Ponnari
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Report this Post09-29-2014 02:23 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Cool, Thanks Paul. I think I'm going to save up and buy yours. Its a lot less work than making my own, and probably not much more $$$$.

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"Because in a slit second, It's gone"

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