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Old 04-09-2009, 06:23 PM   #1
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radiator overflow catch can/tank?

I am looking to buy a new overflow tank for the new aluminum radiator we are installing in my jeep

I was looking on Summitracing and Jegs websites... for a simple idea of an overflow tank there sure are ALOT of options...

ventilated or not
vacuume or no
recirculating or not
drain valve or no drain valve
cap or sealed?

what is recommended? Should I get a recirculating tank? does it matter it if the input is on the top of the can or bottom? stuff like that I have no clue about.

Any help or recomendations would be appreciated.

I'm looking to spend a little extra coin to get something cool looking too. There's litterally hundreds of catch can to choose from but I want to get the right one.

Thanks,

Ben

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Old 04-09-2009, 06:53 PM   #2
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I got my answer from another forum...

the way the stock overflow works is:

i know this is elementary to most of you but I never gave any of this a thought until now so its all new to me. I thought it was just magic.

single line from the radiator neck to the overflow tank. When the radiator pressure gets to a certain point (based on the pressure level of the cap) the cap open a trap door to let fluid overflow to the catch can.

the factory overflow has the line from the radiator enter near the bottom of the plastic catch can. and then when the radiator cools the vacuum from the radiator sucks that fluid from the overflow back to the radiator.


so, based on that understanding... i'd like a tank that has a cap on top (for refilling and checking the level)... but with the line going from the bottom of the tank.

the can doesn't need to be vacuum sealed since the line is under the water level of the tank. And doing it this way the tank recirculates the fluid automatically. I'm still not sure if it matters or not where I place the overflow... does it need to be mounted at a certain height in relation to the radiator cap?
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