Optimus No. 8 (Nickel)

Discussion in 'Optimus No:8 (version prior to the 8R)' started by Tony Press, Apr 10, 2019.

  1. Tony Press

    Tony Press Australia Subscriber

    Offline
    Joined:
    Jun 8, 2013
    Messages:
    5,804
    Location:
    Stinkpot Bay, Howden, Tasmania, Australia
    This fine little stove came to me from Harder in a stove swap.

    The stove was cleaned and fettled, not re-painted, but the tin was protected by a matt clear coat after cleaning.


    P1040569.jpg

    P1040561.jpg

    P1040562.jpg

    P1040563.jpg

    P1040564.jpg

    P1040568.jpg

    P1040571.jpg

    P1040574.jpg

    P1040575.jpg

    "Optimus/Made in Sweden/No. 8/Reg. No. 801106" (Note that "Optimus" is at the handle end not the hinged end of the stove tin).
    P1040524.jpg

    "Swedish Pat No.71018"
    P1040525.jpg

    P1040526.jpg

    P1040527.jpg

    Note that the stove has lost its spot-welded clip in the lid to hold a pricker.
    P1040529.jpg

    Note that the fuel pipe does not come from the bottom of the tank like earlier models of this stove, and is central to the long axis (not offset).
    P1040532.jpg

    P1040533.jpg

    P1040535.jpg

    P1040536.jpg

    P1040538.jpg

    P1040539.jpg

    P1040540.jpg

    The tank lid is not the earliest lid design for these stoves.
    P1040542.jpg


    Testing:

    Preheating.
    IMG_2665.jpg

    Blue flame.
    IMG_2670.jpg

    Test boil.
    IMG_2677.jpg

    No soot on bottom of pan.
    IMG_2679.jpg

    The test rig.
    IMG_2681.jpg

    But, I did notice a very small occasional flame coming from the point where the burner feed tube enters the tank. So I unscrewed the burner from the tank.
    IMG_2684.jpg

    The wick and the mesh were fine. I replaced the burner with a drop of Loctite (medium strength). IMG_2702.jpg

    IMG_2705.jpg

    IMG_2712.jpg
    IMG_2729.jpg

    I made a spill tray for the bottom of the tin (under the burner)
    IMG_2721.jpg


    All up a fine stove!


    The late Bryan Miller proposed a a tentative sequence for "pre-PTC" Optimus 8 and 8R stoves, here:

    PRE PTC OPTIMUS 8s & 8Rs

    Subsequent to Bryan's post there has been much additional information and discussion posted here by a number of Members.

    In this thread of Duane's, OMC produces a list of Primus No. 8 types. My stove is similar to this stove of BernieDawg. That would put it somewhere near the 3/4 mark in the sequential variations of the Optimus No. 8.



    Cheers

    Tony
     
  2. Harder D. Soerensen

    Harder D. Soerensen Denmark Subscriber

    Online
    Joined:
    Oct 24, 2017
    Messages:
    936
    Location:
    Denmark
    Looks great @Tony Press

    You cleaned it up and presented it much better, than I would be able to!

    I miss the older arrangement under the burner on the more modern 8R.
    This old design doesn’t transfer nearly as much heat, as when the spiritcup rests directly on the tin bottom.

    I think we did a swap with two winners :-)
     
  3. MrAlexxx

    MrAlexxx Subscriber

    Offline
    Joined:
    Oct 21, 2015
    Messages:
    952
    Very nice! On my MUST GET ONE list!

    Alex :)
     
  4. hornillo

    Offline
    Joined:
    Sep 7, 2010
    Messages:
    7
    Location:
    tarragona
    good flame, I have one but the bronze tank, I dare not touch it, the previous owner already tried it, left a mark on the tube and folded it a bit. It's more beautiful live :-)
    regards
     
  5. ROBBO55

    ROBBO55 Subscriber

    Offline
    Joined:
    Oct 27, 2014
    Messages:
    898
    Location:
    Somersby, New South Wales, Australia
    G'day Tony, it's running well and you have cleaned it up nicely. :clap:
    A good post as usual. :thumbup:
     
  6. Tony Press

    Tony Press Australia Subscriber

    Offline
    Joined:
    Jun 8, 2013
    Messages:
    5,804
    Location:
    Stinkpot Bay, Howden, Tasmania, Australia
    I noticed I made a mistake above.

    Correction here:


    In this thread of Duane's, OMC produces a list of [Primus should read] Optimus No. 8 types. My stove is similar to this stove of BernieDawg. That would put it somewhere near the 3/4 mark in the sequential variations of the Optimus No. 8.

    Cheers

    Tony