Fast Idle Wax Unit - Sectional Video and Pics

Discussion in 'General VFR Discussions' started by Aced It, Mar 2, 2020.

  1. Aced It

    Aced It New Member

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    Since I replaced my fast idle wax unit I decided to dissect the old one for educational purposes. I've heard some say that there is no wax and it's only a hyperbolic spring. Some have said that it's just wax that expands and shrinks under temperature. And others say it's just a hyperbolic spring in submerged in coolant. In fact, no coolant touches any part of the internals. There are no coolant passages inside the FIWU chamber. As the coolant passes through below the unit, it's temperature increase and decrease has an affect on a copper base. This in turn does in fact liquefy some form of compound, in turn pushing and pulling the pin that interacts with the starter valve base plate on the throttle body assembly. The spring is what keeps the pin in any given position based on the temperature of the coolant. In the exploded pic one thing is missing which is the C-clip that keeps it all together. The damn thing flew across the shop and I can't find it, LOL!

    In my video following the pics you'll see the compound melting however because the unit is sectioned it will not have an effect on the pin. You'll see the compound actually work it's way to the top of the pin but this is not what actually happens.

    Hopefully this provides some sort of education. I thought it was fun. Enjoy.

    20200301_093607.jpg 20200301_093822.jpg 20200301_093932.jpg 20200301_094824.jpg 20200301_094927.jpg

    Inside the chamber:
    20200301_093850.jpg

    Video:
     
    Last edited: Mar 2, 2020
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  2. mello dude

    mello dude Member

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    Its always fun to destroy something for fun... and maybe learn a thing or 2
     
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  3. Aced It

    Aced It New Member

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    Yep. Had to see it for myself. :)
     
  4. raYzerman

    raYzerman Insider

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    Very interesting, thanks for posting up!!
     
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  5. Samuel

    Samuel Member

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    Dammit, I've been doing it wrong this whole time - I've just been destroying stuff... lol
     
  6. Terry Smith

    Terry Smith Member

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    Thanks for sharing; I love finding out what's inside these mysterious components! I disassembled the undiassemble-able 5G brake delay valve for the same reason.
    [​IMG]
     
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