Primus No 4

Discussion in 'Primus No:4' started by Admin, Nov 17, 2009.

  1. Admin

    Admin Courtesy of Iani

    Offline
    Joined:
    Aug 22, 2008
    Messages:
    1,350
    Hi all

    This arrived this morning, an undated Primus No 4, and looking at the catalogues possibly 1907.
    It is missing its top plate.
    A cracking addition to the No 4's that I am custodian of.

    Cost of £5.00 courtesy of the auction site.

    Will add more pictures on at a later date.

    Regards
    Ian

    1258484456-Primus_No_4_001.jpg
     
  2. Wim

    Wim Subscriber

    Offline
    Joined:
    May 12, 2009
    Messages:
    4,414
    Location:
    Dendermonde, Belgium
    Hi Ian, congrats on your "new" stove! It looks to be in a very good condition for its age, looking forward to see it work!

    Regards,

    Wim
     
  3. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Ian, Part #223, brass outer cap for No.4 stove at £5, from Base Camp will allow you to complete your very nice No.4 stove.

    They also have excellent "Con" branded steel outer caps for No.4 stoves at the low price of £1.50 each.

    http://www.base-camp.co.uk/Optimus.html

    Best Regards,
    Kerophile.
     
    Last edited by a moderator: Jul 1, 2015
  4. Matukat

    Matukat Subscriber

    Offline
    Joined:
    Jan 7, 2008
    Messages:
    4,716
    Location:
    Pueblo West, Colorado, U. S.
    NICE deal!
     
  5. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Ian, most of your Primus No.4 might be pre-1911, but the burner seems to be later as it has separate inner and outer detachable caps.
    Check out this earlier post from New Zealand:

    https://classiccampstoves.com/posts/30464

    Best Regards,
    Kerophile
     
    Last edited by a moderator: Jul 1, 2015
  6. Wim

    Wim Subscriber

    Offline
    Joined:
    May 12, 2009
    Messages:
    4,414
    Location:
    Dendermonde, Belgium
    Hi George, I had another look at the photo of the stove, after reading your post and it looks to me it is the burner with the fixed "burner wall with the holes in it" (sorry for this weard way of describing :oops: but I can't put it in better English :roll: ) only missing the "upper" cap or hat. Also the burner cup has no holes in it, so I think it is indeed an old type of burner. Feel free to correct me if I'm wrong! (a close-up of the burner might help ;) )

    Regards,

    Wim
     
  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Wim, I just put my glasses on and had another look. I think you are correct and that Ian might have the earlier form of silent burner, and might only lack a top-plate ( a bit like the back of an old pocket-watch)
    Best Regards,
    Kerophile.
     
  8. Admin

    Admin Courtesy of Iani

    Offline
    Joined:
    Aug 22, 2008
    Messages:
    1,350
    Hi Kerophile and Wim

    It is a bit like the pocket watch thingy. I was looking at Kerophiles French catalogue, and the part number seems to be 4066 from that catalogue.
    BC doesn't have any of these smaller caps.

    Oh well, she will have to have a conventional burner head.

    https://classiccampstoves.com/threads/11195

    Regards
    Ian
     
    Last edited by a moderator: Jul 2, 2015
  9. Wim

    Wim Subscriber

    Offline
    Joined:
    May 12, 2009
    Messages:
    4,414
    Location:
    Dendermonde, Belgium
    Hi Ian,
    you could make one yourself from a conventional outer cap (like I did for an early N°5, same type of burner but yours is smaller I think), I've posted this in the fettling section. Fitting a later burner would not do justice to this Grand Old Lady! ;)

    Regards,

    Wim
     
  10. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Ian, what is the diameter of the burner part with the holes?
    It may be that a conventional No.4 outer cap could be cut down to provide a top-piece.
    Best Regards,
    Kerophile.
     
  11. Admin

    Admin Courtesy of Iani

    Offline
    Joined:
    Aug 22, 2008
    Messages:
    1,350
    Hi Kerophile

    The burner part with the holes, is the same diameter as the conventional No 4 outer cap.

    I'll try it later in the week sometime.

    I know it works as I have got the same type of burner head on my Monitor No 5.

    I would like to put three little lugs on the inside of the cap that I have cut down to make it more stable, would it in anyway impede the flow of gases out of the burner head.

    Kind regards
    Ian
     
  12. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Ian, Check out this post on a Primus No.100 damper. Slightly different size from your No.4 burner, but the same principle:

    https://classiccampstoves.com/posts/29706

    Lugs on the cap will obstruct gas flow, so you need to keep them thin and perhaps use 3 rather than 4, if you must have them. If the cap is made a tight press-fit, you might get away without needing them.

    Good Luck with your fettle.

    Best Regards,
    Kerophile.
     
    Last edited by a moderator: Jul 1, 2015
  13. Admin

    Admin Courtesy of Iani

    Offline
    Joined:
    Aug 22, 2008
    Messages:
    1,350
    Hi Kerophile

    I have tried the flat cap jobby, but it didn't work. It is not the right size for the burner head.

    Anyway I came across a spare No 4 burner head, and I fired it up earlier this evening.

    Kind regards
    Ian

    1258672094-Primus_No_4_002.jpg
     
  14. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    12,465
    Location:
    Far North of Scotland
    Hi Ian, lovely flame pattern!
    These No.4 burners are rather special, aren't they? I think it is the deep bowl of the burner.
    Don't give up on the early model, you should be able to make a top-plate for it.

    Best Regards,
    Kerophile.