Brian does Ridders flame eater

Discussion in 'A Work In Progress' started by Brian Rupnow, Feb 14, 2018.

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  1. Feb 14, 2018 #1

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    I ordered up the newest Jan Ridder flame-eater design, and have modeled it all this morning. I have changed metric plate and shaft sizes to the nearest imperial (inch") size that is available and commonly used. This involved juggling a few parts around to compensate for minor differences in dimensions. This is the new design using a stainless cylinder and graphite piston and internal valve. These flame eater engines are notoriously dirty due to soot in the flame being sucked into the cylinder and resulting condensation. I am not in any great hurry to make this engine, but I know how that has worked out in the past. The amount of time I spend in my machine shop is in direct proportion to how much "real" work I have in any given week. ---Brian
    [​IMG]
    [​IMG]
     
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  2. Feb 15, 2018 #2

    vederstein

    vederstein

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    Must do dumb things....

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    Oh come on Brian. You'll have this thing done in no time. When you start a project, you tackle it like a fly on stink. ;)

    ...Ved.
     
  3. Feb 15, 2018 #3

    Journeyman

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    Brian, I did one of these a few years ago. It works but was very tempremental to get going. If I can do it I'm sure yours will be up and running in no time. Good luck with the build. My effort ***HERE*** a rather poor video I'm afraid...
    John
     
    Last edited: Feb 15, 2018
  4. Feb 15, 2018 #4

    rlukens

    rlukens

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    John, I see you used brass for the internal valve. What material for the piston?

    Brian... same question.

    Russ
     
  5. Feb 15, 2018 #5

    Journeyman

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    Started off with cast iron for both valve and piston but with all the condensation it quickly rusted/gummed up. Changed both the valve and piston to brass which is an improvement. Jan reccomends graphite but I never tried this. The cylinder is stainless (no idea what grade I happened to have a bit the right size!) machined quite well though, I managed to make the flame hole too long, confused end and centre measurements, probably another reason for it being tempremental. This is the early version, the later one has a larger bore.
    John
     
  6. Feb 15, 2018 #6

    Brian Rupnow

    Brian Rupnow

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    I will be using graphite for piston and valve, 316 stainless for cylinder.---Brian
     
  7. Feb 15, 2018 #7

    Brian Rupnow

    Brian Rupnow

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    One surprising thing about this engine is how few parts it actually has. I have never worked with machineable graphite, in fact right at the moment I don't even know where to get it, but like everything else, I will find out as I go along.
    [​IMG]
     
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  8. Feb 15, 2018 #8

    rlukens

    rlukens

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    For what it's worth, I just ordered a 1.250 X 12 inch bar of JC3 graphite from this outfit: http://beckergraphite.com/stock-graphite-rods/
    $16.00 plus shipping... You have to place order by phone.
    Russ
     
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  9. Feb 15, 2018 #9

    Brian Rupnow

    Brian Rupnow

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    Thank you Russ--I may give them a call.--Brian
     
  10. Feb 15, 2018 #10

    Brian Rupnow

    Brian Rupnow

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    I have enough brass left over from the power cylinder on the Stirling engine to make a flywheel for the flame eater engine. I picked up 6" of 1 1/2" 316 s.s. for $14 this morning. I also picked up some "real" work today, so now I get to do the great balancing act.
    [​IMG]
     
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  11. Feb 15, 2018 #11

    el gringo

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    I find graphite @ Amazon in 1 foot lengths...machines nicely with standard tooling...I'm using carbide index cutting .
    Ray M
     
  12. Feb 15, 2018 #12

    Brian Rupnow

    Brian Rupnow

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    Thanks guys--Remember, I am in Ontario, Canada and if I shop out of USA I pay killer shipping charges and dollar differential.
     
  13. Feb 16, 2018 #13

    el gringo

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  14. Feb 16, 2018 #14

    CFLBob

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    Brian, your drawings are great!

    Can I ask what software you drew then in?


    Bob
     
  15. Feb 16, 2018 #15

    Brian Rupnow

    Brian Rupnow

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    Solidworks
     
  16. Feb 17, 2018 #16

    Brian Rupnow

    Brian Rupnow

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    I called my bearing supplier today to check and make sure that the metric bearings were available. They were, so I ordered them--there is about a 5 day delivery because of heading into the long weekend here. I also changed the exterior shape of the cylinder. The way Jan had it shown would require a form tool to make the V shaped cooling fins, so I changed them to conventional cooling fins that can be made with a parting off tool. I have my lump of flywheel brass up in the lathe, and will probably finish the flywheel tomorrow.
    [​IMG]
     
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  17. Feb 17, 2018 #17

    Cogsy

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    I have a couple of thoughts from when I built this engine if you want them Brian - no charge at all. Now bear in mind this was my first ever engine so I might have created my own problems, but the 3mm valve rod hole gave me fits. I didn't have a long enough bit to do the whole length of the hole at once so I had to come in from each end, resulting in a bit of misalignment and lots of hassle getting the rod to move smoothly. Perhaps now, even with access to longer bits, I'd think about drilling the hole a little larger and bushing each end to reduce dreaded friction.

    The other thing I thought about was the travel of the valve. If you let it move down the bore any further than what it needs to achieve a seal, you're wasting precious vacuum, plus power to drive it back open. If I was making it again I'd make sure the valve moved the absolute minimum amount to achieve seal for maximum power.

    I could write a whole story about machining the graphite but I'm thinking most of the issues there were lack of experience which won't be a problem for you. Good luck with the build, I'm sure you'll have less problem with it than I did.
     
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  18. Feb 17, 2018 #18

    Journeyman

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    I had similar problem, on mine the hole had to go through all the fins and drifted off-line. I made the hole larger and did indeed put a small brass bush at either end, much less friction.

    John
     
  19. Feb 17, 2018 #19

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    Thank you gentlemen. I shall take this all into account.---Brian
     
  20. Feb 17, 2018 #20

    Brian Rupnow

    Brian Rupnow

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    This mornings work yields a pretty little brass flywheel. The best thing about it was that the material was "left over" from the Stirling engine. I try and salvage every little short left over piece of material that I can.
    [​IMG]
     
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