Primus 1320 up and running.

Discussion in '1320' started by Harder Sorensen, Jul 16, 2023.

  1. Harder Sorensen

    Harder Sorensen Subscriber

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    71120963649__3CB56F47-F0C8-493A-B575-DE83C1BEBE99.jpeg IMG_2448.jpeg IMG_2449.jpeg IMG_2452.jpeg Got this 1320 up and running on pure alcohol (as supposed to).
    No date code at all underneath the fount??
    (Wish I could find/swap a Primus Globe for it in 122mm x 122mm)
     
  2. presscall

    presscall Denmark Subscriber

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    @Harder Sorensen
    A handsome lamp Harder, and a tolerable self-portrait in the last shot.

    John
     
  3. Harder Sorensen

    Harder Sorensen Subscriber

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    @presscall
    Thank you - At least I was dressed :lol:
     
  4. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    A fine example and it's working well.:thumbup::thumbup:
     
  5. Hanzo

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    What a beautiful lantern, best kind to burn.
     
  6. Fireexit1 United Kingdom

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    Very nice ! :thumbup: well worth preserving
     
  7. presscall

    presscall Denmark Subscriber

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    @Harder Sorensen
    A question about fuel consumption, Harder.

    Is it noticeably worse using alcohol because of the larger jet orifice, maybe requiring more frequent re-pressurising during a session as the fuel depletes more quickly than with kero?

    John
     
  8. Harder Sorensen

    Harder Sorensen Subscriber

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    @presscall
    In my opinion - yes.
    I recall last time, when I had a 1320 - I was surprised how fast it would spend fuel compared to its brother - the 1020.
    Pump-wise - a bit more often as the 1020, but that is my best guess, as a comparison would demand a test with the 1020 being pumped the same amount of strokes and the same amount of fuel i both founts - which I haven’t done - yet…
     
  9. presscall

    presscall Denmark Subscriber

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    I suppose it illustrates - historically speaking - that it scored over its kerosene stablemate when alcohol was more readily available than kero.
     
  10. Nils Stephenson

    Nils Stephenson Founder Member

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    @presscall
    The fuel consumption is noticeably higher with the alcohol version. There is still enough for a good night of burning, but it needs to be filled up each day.

    This all relates to the size of the jets. For a 1020, the jet is about 0.2 mm. This gives an area of 0.31 mm^2. For the 1320 the jet is 0.3 mm, giving an area of 0.71 mm^2. At the same pressure, this should give more than twice the consumption. The advantage is that alcohol usually doesn't need as high a pressure. At best, I have had up to 2/3 burn time with alcohol.
     
  11. presscall

    presscall Denmark Subscriber

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    I’ve only had experience of alcohol-fuelled pressure stoves, where even with the larger jet orifice compared to the kerosene-fuelled equivalent, not only is the fuel consumption greater but the burner puts out less heat because of the lower calorific value of the fuel. Whereas extended boiling times for a stove fuelled on alcohol are noticeable compared with a kerosene-fuelled burner of the same type at a given tank pressure, the illumination of a mantle evidently isn’t when tank pressure is reduced. Makes sense, given the nature on mantle incandescence.
     

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