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ScubaPro 109 Balanced Vs Sherwood Maximus

Discussion in 'Regulators' started by mrarmyant, Jan 26, 2019.

  1. mrarmyant

    mrarmyant Angel Fish

    # of Dives: 100 - 199
    Location: Dallas
    14
    1
    3
    I have a rebuilt 109 with MK10 1st and a Maximus with its stock 1st. What is seen as the better setup with regards of where it can dive, reliability, ease of maintenance, etc? I appreciate the metal body and the few parts of the 109, but it's weird to think a design that old can still really be superior to modern tech. I have only used the Maximus, and loved the fins in it preventing the dry mouth, but thought the metal body might do similar. Most of my diving is tropic, soon to be somewhere drysuit esque tho.

    Has anyone owned and used both?
     
  2. rhwestfall

    rhwestfall Solo Diver

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    12,121
    10,747
    113
    I'd take a 109 (though I would prefer it to be upgraded to a 156) any day! I own about 15 109/156 seconds. Fantastic regulators. I can't compare to the Sherwood because, for 30+ years, I have been diving 109/156/g250xx stages.

    YMMV
     
    BenjaminF and buddhasummer like this.
  3. mrarmyant

    mrarmyant Angel Fish

    # of Dives: 100 - 199
    Location: Dallas
    14
    1
    3
    Good to hear! I got the kit off vintage double hose which I believe ups it to a 156.
     
    rhwestfall likes this.
  4. g1138

    g1138 Marine Scientist

    # of Dives: 500 - 999
    Location: Charleston, SC
    3,051
    779
    113
    It's a loaded question and to you the user they should be equal if both 1st stages are tuned right.
    I would just pick whichever one makes you happy to dive with or flash around.

    From a service technician standpoint however, a current edition (9000Pro model) Maximus will be able to be tuned to a wider range of easy breathe to hard breath. The 109 takes more of a PITA to get it to do that; sometimes with certain individuals you can't get it to breath light enough without it freeflowing. So that's what the new tech really has improved on. Nothing really noticed by the end user; lots noticed by the technician.

    My 109's I can't for the life of me get them below 1.4 inches of water cracking pressure. Now 1.4 is perfectly normal and good but I'm anal about having my regs breath at a 1.0-1.2 inch of water. So I have to put up with that.

    The newer tech regs often allows you more adjustment points to change the setpoints for your reg. Sherwood allows adjustment of the orifice and fine tuning poppet spring tension. With the 109 you only have the orifice adjustment and bending the demand lever, which the latter is impossible to fine tune to your naked eye.

    So for instance with a Maximus, I can hit any range of setpoints easily and creep gradually from easy breathe to hard breathing. With the 109, I would be jumping gaps from easy breath, moderate, hard breathing. There's not an even spectrum of fine tune adjustment; but when you do get it right it's much more satisfying.

    For moisture retention though, I would argue the 109 is better than the Maximus. More metal means greater surface area to condense. The Maximus only have the metal fins and the metal barrel to condense, so far less surface area.

    Now if you're talking the older 7000 series Sherwoods (the ones where the 1st stage doesn't do a 90 bend and just comes straight from the tank valve). Then those are exactly equal to the 109 in terms of tuning.
     
  5. JackD342

    JackD342 Dive Shop

    # of Dives: 500 - 999
    Location: Highland Park, IL
    2,058
    1,145
    113
    I know nothing about the Scubapro to weigh in with a comparison, but sounds like you will soon be diving in temps below 50F and the current Maximus Pro has passed the EU testing for cold water. So if that can't he said for the Scubapro, that would be a clear difference. I don't know one way or the other regarding earlier Maximus versions.
     
  6. lexvil

    lexvil Loggerhead Turtle

    # of Dives: 1,000 - 2,499
    Location: jamestown, ca.
    1,410
    933
    113
    A kit from VDH to service a balanced adjustable 109 (156) is $12 and consists of 5 parts, the 109 is very simple and easy to maintain.
     
    StefinSB likes this.
  7. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    6,289
    6,216
    113
    I dive Sherwoods, although not the Maximus, and on one reg set have changed to a 109/156 primary and use the blizzard as the secondary. I must admit that I do like shiny metal seconds.
    Also, it's good to know which Maximus, Sherwood has been using the same names for regs for decades.

    The basic design of piston regs has not changed since their inseption, there have been improvements that have made regs better over the years, but for a lot of us those changes do not make a real noticeable difference when diving, especially in rec limits..



    Bob
     
  8. rhwestfall

    rhwestfall Solo Diver

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    12,121
    10,747
    113
    And the 109/156 with its all metal body & barrel is extremely successful in temps in the mid-to-upper 40's. I have used it successfully in the upper 30's diving the Great Lakes for a long time...

    The reg will never achieve EU certification as it is no longer in production.

    YMMV
     
  9. Hawaii Treasure Finder

    Hawaii Treasure Finder Angel Fish

    # of Dives: 200 - 499
    Location: Hawaii
    12
    2
    3
    Would be interested if anyone knows if the low-pressure poppet is the same in both the Maximus and the 109? I've converted a few 109s to the new poppet which hasn't been cheap - but see the Maximus poppet on eBay selling for a song ($2.50...)
     
  10. happy-diver

    happy-diver Skindiver ScubaBoard Sponsor

    # of Dives: I just don't log dives
    Location: queensland Melbourne Victoria diver
    1,051
    605
    113
    Well start singing and splash the cash buy one and tell us

    The dimensions look identical don't you think

    but I found a service guys that gave me some pulled out for no reason ones


    Because all the gear you will ever use, will always be "used" second hand
     

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