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  1. #26
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max


    ORIGINAL: rcnats

    ST Engines out of Mexico has new glow to gas conversion and I got one for the BGX-1. Here's what's in the kit.
    Here's the original engine.
    Here's how it's done.
    1. Remove the hub and carb. Keep the''O'' ring for the Walbro carb.
    2. Remove the glow plug. Kit uses a 1/4-32 spark plug.
    3. Remove back plate, drill 1/8 hole and tap for the supplied pressure fitting for the Walbro carb.
    4. Install the carb adapter, carb and sensor ring. The instructions show the correct location.
    5. Connect the RCEXL ignition.
    6. Connect you battery, add prop, gas, and enjoy!
    7. I used a Zinger 18x6-10 prop. Here's the proff!
    How has this conversion worked out for you? Any up-dates?
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  2. #27

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Thus far, I haven't had time to set my engine up, and run it in. I am eager to get it up and running!
    The "kit" I received looks very well laid out. I am waiting for a CDI test unit, and a timing rig, before I
    proceed.

  3. #28
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Check this out.
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    Club Saito member #715
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  4. #29

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Do you have any details?

  5. #30
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    It's the connecting rod from the OS 33 GT engine. Apparently the BGX and the 33GT share the same wrist pin part number. I don't have a 33GT so I can't measure the crank pin but its half way there.

    The stroke between the two engines is .015" different. Could be the bump in compression between the two engines, the BGX having a couple points less.

    Interesting to say the least...
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  6. #31

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I'd be curious to see if the crankcase, and the cylinder head, had the clearance to fit the 33GT rod. I dast believe some serious study
    is called for.

  7. #32
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Wouldn't it be nice if it was a drop-in replacement....
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  8. #33

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    It'd be nice, but highly doubtful.

  9. #34
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I'm guessing that the crankshaft on the glow engine is not hard enough to accept a roller bearing. We would need to get data on the Rockwell harness of the material the crank was made from.

  10. #35
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    ORIGINAL: irocbsa

    I'm guessing that the crankshaft on the glow engine is not hard enough to accept a roller bearing. We would need to get data on the Rockwell harness of the material the crank was made from.
    The shaft hardness must be Rockwell C59 minimum and a maximum roughness of 15 microinch AA.

    http://www.maintenanceresources.com/...ings/rbshf.htm

    If you had to change the crank pin....A good machinist and a gage pin the size you needed would do the trick.
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  11. #36
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I just got my kit in for the BGX-1.

    It looks quite nice.

    Questions:

    What should I use for an oil to gas mix ratio?

    Where can I purchase more plugs?


    The package from Max took almost three weeks to arrive, so if you order one just be patient.
    The trip through customs seems to slow things down greatly.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  12. #37
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Also I received NO instructions. Can anyone point me to the instructions?

    Thanks.
    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  13. #38
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    First off, DO NOT run less than 16:1 gas/oil ratio. Ask me how I found out the hard way....

    Instructions (with pictures!) are on the first page of this thread.

  14. #39
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I've been fooling around with mine. I made a Walbro adapter out of Delrin and lapped both sides flat. I need to run a pulse line from the rear end of the radial mount to a pulse fitting on the front of the carburetor.

    It's a Walbro WT-499 so I'm going to run it on glow and see how it works out. If it runs good, I'll add ignition and see about using FAI no-nitro fuel.
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  15. #40
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Very nice job.

    What material you use for adapter?? is not aluminum

    If you let me I can suggest a biguer venturi walbro

    I can sugest too test 20X10 prop using 30:1 5w20 synthetich oil


    my best regards

    max
    Special Tuned Engines (STengines)

  16. #41
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    It's made from Delrin.

    http://www2.dupont.com/Plastics/en_U...in/Delrin.html

    It's pretty tough stuff, it holds threads well.
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  17. #42

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I believe he is using the 499 because it works better with alki fuels (larger porting, for the venturi size). Also, from my experience, having a slightly smaller venturi will make more torque.

  18. #43
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max


    ORIGINAL: challenger_i

    I believe he is using the 499 because it works better with alki fuels (larger porting, for the venturi size). Also, from my experience, having a slightly smaller venturi will make more torque.
    Yep, if I can run a 20" WWI type propeller on it using FAI glow fuel I'll be happy. I've run it on the bench and it's a very smooth running engine.

    It looks like Bisson is making a new muffler for this engine as well. It appears to have more volume than the first one they made.
    Club Saito member #715
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  19. #44

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Do you have any drag racing activity in your area? If so, methanol will be available, and pretty inexpensive. If you are using strate meth, and oil (castor/synth blend), it'll be cheaper to "roll your own".

  20. #45
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Yea, There's a drag strip in Bithlo not far from me. I'm thinking along the same lines. I've got 4 gallons of Blendzall green label. It should last me a while.
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  21. #46
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    To anyone who is using Max's kit...

    How is the sensor ring supposed to be mounted?

    My sensor ring does not look like the one in the instructions Max e-mailed me.

    Worst still if I orient the ring as per the instructions with the "adjustment screw" facing straight up in relation to the head, then the ring is restricted by the carb mount...

    See attached picture.
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    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  22. #47
    Broken Wings's Avatar
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max


    ORIGINAL: opjose

    To anyone who is using Max's kit...

    How is the sensor ring supposed to be mounted?

    My sensor ring does not look like the one in the instructions Max e-mailed me.

    Worst still if I orient the ring as per the instructions with the ''adjustment screw'' facing straight up in relation to the head, then the ring is restricted by the carb mount...

    See attached picture.
    You've got it about 90 degrees off....

    orient the ring as per the instructions with the ''adjustment screw'' facing straight up in relation to the head

    Adjustment screw straight up and down like the way the piston travels.
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  23. #48

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    I bet THAT would have had a bit of "kick-back" when propped!

  24. #49
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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    ORIGINAL: Broken Wings


    You've got it about 90 degrees off....

    orient the ring as per the instructions with the ''adjustment screw'' facing straight up in relation to the head

    Adjustment screw straight up and down like the way the piston travels.
    That's just it.... I don't have an "adjustment screw" like that in the instructions.

    Instead I have a tangential tightening screw that is much like a hose clamp screw.

    I can't position it straight up, as then the tightening arm is blocked by the carb mount.

    Click on the picture I posted and you'll see the problem.

    Also note the position of the sensor when the screw is straight up.



    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  25. #50

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    RE: OS BGX-1 Glow to Gas Conversion (Yeah!) Thanks Max

    Orient the pick-up ring such that the screw is in the vertical plane. Not the tab it runs through.


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