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Thread: Senft "Poppin" ENGINE

  1. #1
    Join Date
    Mar 2008
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    Barrie, Ontario, Canada
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    8,441

    Default Senft "Poppin" ENGINE

    I just finished building the latest flame-licker engine designed by Jan Ridder, and my results were not what I hoped for. I did get it to run--long enough to get a video of it running.--But barely. I found it to be an easy build but a very temperamental and difficult engine to run. I don't think this was a result of my workmanship, as I have 25 other self built engines which all run quite well. It may have been my choice of 316 stainless steel for the cylinder. I tried it with a cast iron piston and valve and with a machinable graphite piston and valve, but the performance was no better with either material. I still want a flame licker engine which starts and runs repeatably, and after doing a fair bit of research have decided to build a "Poppin" engine from plans by Dr. J.R. Senft. I will attempt to post my progress and pictures of this engine as it is built.
    Brian Rupnow

  2. #2
    Join Date
    Dec 2006
    Location
    iowa
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    439

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    I built the same Jan Ridder engine and never got it running. My Poppin'went on the second attempt.
    https://youtu.be/f1rv3nTnOck
    Last edited by Bmyers; 03-11-2018 at 09:23 PM.

  3. #3
    Join Date
    Jan 2009
    Location
    Nordland, WA
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    819

    Default

    I'm watching, Brian! This whole thing has been extremely educational... I know what not to do. Maybe if I give one a try I might stand a chance.

    Thank you for your excellent postings.

    Pete
    1973 SB 10K .
    BenchMaster mill.

  4. #4
    Join Date
    Mar 2013
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    1,335

    Default

    Quote Originally Posted by Bmyers View Post
    I built the same Jan Ridder engine and never got it running. My Poppin'went on the second attempt.
    https://youtu.be/f1rv3nTnOck
    What is the operating principal here? Is it internal combustion by sucking in gases from the flame?

  5. #5
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    Mar 2008
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    If you really squint hard, and use your imagination, you can see the frame of this engine layed out on a piece of 2" x 1" aluminum bar.--Everything has to start somewhere.
    Brian Rupnow

  6. #6
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    Mar 2008
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    Gary--Operational principal is that when you spin the engine over by hand, it sucks an external flame from an alcohol burner into the cylinder. Then the valve closes and the flame inside goes out, thus rapidly cooling and creating a vacuum. The vacuum pulls the piston back to top dead center, and just as it gets there the valve opens and sucks in another flame.--The operation then hopefully continues to repeat itself.
    Brian Rupnow

  7. #7
    Join Date
    Apr 2005
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    1,213

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    Use thermal diffusivity in selection of material for the cylinder.

    Aluminum-silicon alloy is exceptional; machinability, hardness/ wear resistance, thermal diffusivity.

    7075, 6061 would be other options in aluminum alloys
    Last edited by bob_s; 03-12-2018 at 01:00 PM. Reason: Typo in alloy

  8. #8
    Join Date
    Jul 2005
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    130

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    I am a rank amateur. I built the one you picture with ci cylinder and piston. After a bit of fiddling it ran well and would run as long as there was flame.

  9. #9
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    Well jeez, Louise--How many set-ups did you think there were going to be?

    Brian Rupnow

  10. #10
    Join Date
    Mar 2008
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    Barrie, Ontario, Canada
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    And some more---

    Brian Rupnow

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