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Thread: Another tank

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  1. #1
    Join Date
    Apr 2008
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    Bohemia, NY
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    Default Another tank

    I just got done building this tank for a friends rx-7. Its a air water separator for the cooling system. Made it out of 3/16 5053 aluminum all tig welded together. The bottom has a custom machined fitting to restrict flow.
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  2. #2
    Join Date
    Oct 2006
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    Default

    If you're getting "air" in the cooling system it most likely means you have a cracked intermediate housing and the engine needs rebuilding. The S4 and S5 13b's are notorious for this failure.

    Rebuilding the rotaries is actually rather simple. The engine doesn't weigh much more than 200lbs so you can lift it out with a friend and a piece of 2x4 spread between you if you don't have an engine hoist.
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  3. #3
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    Its a FD and as far as i know all came with a air water seperator.
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  4. #4
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    Ah, this seems to be another of the basterdization of automotive terms that brought you the "sway bars" (they're ANTI-sway bars).

    What you built was an "expansion tank." Something that's very common on a lot of cars these days.
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    Airco MED20 feeder
    Thermal Dynamics Cutmaster 81
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    And more machinery than you can shake a 7018 rod at

  5. #5
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    lol jim call it what you want i just saying thats what mazda called it. I would think it is not a expansion tank due to the fact that the coolent is always running through it and it is always filled and pressurized. But hey i dont know much about this it just what i was told i could be wrong.
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  6. #6
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    The function is identical. As the coolant heats up and expands it fills the cavity of that tank. My 87 325i had one.

    To call it a separator would imply that air is entering the system somewhere, but the reality is that it's located at the highest point in the system, so as air is purged (after maintenance) it cannot re-enter.
    Syncrowave 250DX
    Invison 354MP
    XR Control and 30A

    Airco MED20 feeder
    Thermal Dynamics Cutmaster 81
    Smith O/A rig
    And more machinery than you can shake a 7018 rod at

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