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Poseidon Cyklon 1980's vintage

Discussion in 'Vintage Equipment Diving' started by rfwoodvt, Feb 14, 2021.

  1. rfwoodvt

    rfwoodvt Angel Fish

    # of Dives: 0 - 24
    Location: Vermont
    Was gifted one of these in excellent shape. Came with only a one second stage though. Searching online it seems that this setup was pretty much a one second-stage system. However there is another port on the first stage but I don't know if it can be used to put another regulator on.

    I will be taking it to my LDS to have it overhauled but before I do I wanted to know a bit more about the first stage ports.

    They are all marked, one is LP and that has second stage attached to it. One is marked HP and that has the console. A third is marked R and that has the BC fill hose attached and the final port is plugged and marked U. It is this last port I am curious about. it is on the same level as the LP and R ports which make me think it is also a low-pressure port.

    Also, what do the markings "R" and "U" stand for?

    Any input would be welcome!

  2. p_kos

    p_kos Barracuda

    # of Dives: 200 - 499
    Location: Ontario
    Let’s see some pics! The U and R ports are also low pressure ports so you can put another second stage on, I don’t remember what the letters stand for. If it’s the first stage I think you have it may need adaptors to use generic hoses, those ports are not standard sizes (if the port plugs look like protruding hex screws then that’s the case). The Cyklon second stage needs an intermediate pressure of 166 psi so make sure to pair it with another second stage that can be tuned to handle that pressure, ideally another Cyklon.
  3. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    be careful taking it to your LDS. Unless they service a lot of Poseidon regulators you are far better sending it off to someone like @rsingler at Napa Scuba or the guys at Air Tech Scuba in Raleigh who service these things all the time.

    The R port will have a touch higher flow and there is some other port geometry stuff in there, but it's not really significant. The U should not be restricted at all
    Luis H and p_kos like this.
  4. rx7diver

    rx7diver Solo Diver

    "R" is the preferred port for the 2nd stage. It is the venturi-assist port.

  5. gqllc007

    gqllc007 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Albany NY
    This is correct...also send it to rsingler.....most likely your LDS doesn't know anything about a Cyklon...We dove with that exact one and the ports are not typical threads...we eventually went to the Poseidon's that had regular threads.. There were some Cyklons with the metal bodies and I think the metal pucks...they eventually made them plastic as well
  6. happy-diver

    happy-diver Skindiver Just feelin it

    # of Dives: 1,000 - 2,499
    Location: same ocean as you
    The plastic thing is a cover on the brass thing
  7. gqllc007

    gqllc007 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Albany NY
    We had complete plastic Cyklon's 5000...red and yellow...the body and the puck with purge and diaphragm Previous to that they had the 300 and then I think the all metal Cyklon..which I think Leisurepro still sells??

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