Converting a knackered silent burner into a regulated silent burner

Discussion in 'Fettlers Master Class' started by Twoberth, Apr 10, 2021.

  1. Twoberth

    Twoberth United Kingdom Subscriber

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    This Primus silent burner was knackered: the tubes were blocked and the nipple seat threads were stripped. But other than that the burner was in decent condition.
    2021-04-10 002 001.JPG
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    So I decided to cut it open and unblock it, and then convert it into a regulated burner with a new jet.
    This is how I did it.

    First I cut and unblocked the burner, cutting the tubes just above the jet seat

    2021-04-10 002 003.JPG 2021-04-10 002 004.JPG

    Then I inserted a regulator barrel that I devised from measurements taken from an Optimus 111 burner (details further down).

    2021-04-10 002 006.JPG

    The barrel has a drilled and threaded inside, and takes a normal Optimus 111 spindle, packing and fittings - except that the pinion teeth are ground off the spindle so the gas can pass easily from the inlet tube to the nipple



    2021-04-10 002 008.JPG

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    2021-04-09 001 009.JPG

    There is only one inlet for the gas into the regulator barrel, this feed come from the left hand tube in the photos. The right hand tube is redundant, and is used for support only.

    Next the barrel (without nipple and fittings) was brazed in place using Silverflo 55 braze alloy and Easyflo flux.

    2021-04-10 002 009.JPG

    and the fittings and nipple are fitted

    2021-04-10 001 016.JPG

    2021-04-10 002 010.JPG

    2021-04-10 002 011.JPG

    New washer from @Spiritburner, and the burner is fitted on an old SVEA tank and works as it should from full throttle to simmer.

    2021-04-10 002 021.JPG

    2021-04-10 002 022.JPG
    So, from scrap burner to regulated burner in an afternoon. I am very happy with this recycling project.

    Regulator barrel internal details. The outside of the barrel has flats ground in a vee (visible in photo 6) so that it is cradled securely between the two long tubes. There is also a small flat ground on top of the nipple hole so that the nipple makes a gas tight seal.

    2021-04-10 003 001.JPG
    I now have made three of these regulated burners. The two silents were from knackered burners.
    The roarer burner was made completely from scratch and will be posted separately.

    2021-04-10 002 023.JPG
     
  2. Ian

    Ian Subscriber

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    Excellent stuff! :clap:
     
  3. The Warrior

    The Warrior United States Subscriber

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    Fantastic work.
     
  4. CRAZY CRAB

    CRAZY CRAB United States Subscriber

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    now that is one good idea
     
  5. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Twoberth Well done Duncan and bravo to whoever nominated your post to go into the Fettlers’ Master Class.

    John
     
  6. Twoberth

    Twoberth United Kingdom Subscriber

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    Thanks everyone.
     
  7. Harder D. Soerensen

    Harder D. Soerensen Denmark Subscriber

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    Definately a worthy Master Class example.
    Well done @Twoberth
     
  8. Optimust

    Optimust United Kingdom Subscriber

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    @Twoberth.

    We must thank You for shareing your
    very good idea;s with us all, very well
    described & illustrated. Best to you.
    Optimust. :clap:
     
  9. CRAZY CRAB

    CRAZY CRAB United States Subscriber

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    if i sent you one of me spear burners, how much to convert it, please
     
  10. Big Si

    Big Si Subscriber

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    Amazing work there.

    Si
     
  11. Twoberth

    Twoberth United Kingdom Subscriber

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    @CRAZY CRAB Thanks for your request, but I don't intend to convert other peoples burners as I have too many other house and hobby projects to do. The conversion is not as hard as you may think. You don't need a lathe if you start with 1/2 inch brass bar, only normal workshop tools and the correct taps.
     
  12. CRAZY CRAB

    CRAZY CRAB United States Subscriber

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    many thanks, no probs, :)
     
  13. Twoberth

    Twoberth United Kingdom Subscriber

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    Thanks Harder, Big Si and Optimus.
     
  14. Rangie

    Rangie Subscriber

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    Excellent fettle, well done :thumbup::thumbup:
    Has given me inspiration to try it on the biggest Liberty silent, will report back.... :mrgreen:

    Alec.
     
  15. Twoberth

    Twoberth United Kingdom Subscriber

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    Thanks Rangie. I look forward to your results.