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  1. #1

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    Super Tigre ST 3000 Gas Conversion

    Hi everybody.Today I started my converted ST 3000 equiped with Walbro 28 size WA99B (Stihl Chainsaw) ,RCEXL ignition,rimfire spark plug.Oil to Gas ratio 12:1,temperature outside 5 celsius.
    With Menz 19X8 7200 rpm,18X10 7450 rpm,canister muffler,about 200cc volume,12mm exhaust diameter.
    My questions to you all my friends:
    I can hold a steady 1600 rpm idle,but after a prolonged WOT engine stops.If I set idle to 2000 rpm,no more problems.Any Fixes?
    After 4 hours of running at various rpm,I inspected inside the engine,it is shiny clean and no traces of anything.VERY oily everything.Can I lower the oil content to about 16:1 ?Oil used is common chain saw type,nothing expensive synth oil.
    I did following modifications:On upper side of connecting rod i made 2 more oil holes 1.2mm diameter 30 degrees left and right of existing one,on big end I made 4 holes 1,2mm spaced equally left and right of existing hole.Advance timing is critical:32 degrees.3-4 degrees more or less are very significant in top end rpm gain or loss.
    I forgot,the engine is old and used,but still good compression.

  2. #2
    Moderator w8ye's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    When it quits it must be too lean

    Everyone runs 16:1 when using gas on these.
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
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  3. #3

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    RE: Super Tigre ST 3000 Gas Conversion

    Tnx for reply,I must to tell you that I found the sweet spot on L setting and the idle speed I set with butterfly screw only.Quite smokey,does not seem to be lean.Has same performance as DLE 30.DLE 30 also quits if idle is set under aprox.2000 rpm,all this at good L setting.
    YO8SSD

  4. #4

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    RE: Super Tigre ST 3000 Gas Conversion

    Today i made new tests.Here is a video.
    http://www.youtube.com/watch?v=mj9D7B1ylms

  5. #5
    KenLambert's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    I run mine at 50:1 ratio with out any problems
    website
    www.lambertsrc.com
    Super Tiger conversions
    thanks Kenneth

  6. #6

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    RE: Super Tigre ST 3000 Gas Conversion

    Well sir,I understand that,but I still have Bronze bushing in connecting rod.Otherwise the engine is absolutely clean inside and does not overheat excesively.I wish I have your maschining facilities,but we are living in a country where such machines are hard to find.I apreciate your work which inspired me a lot.Please keep going...

  7. #7
    Moderator w8ye's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    The engine sounded pretty good after you set the needle

    Post some more videos when you run it more
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
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  8. #8

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    RE: Super Tigre ST 3000 Gas Conversion


  9. #9
    PlaneKrazee's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    Nice job!
    a never-ending battle for truth, justice and the American way

  10. #10
    Maximiliano Galvez's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    Congratulations Nice Job

    I tested Rinfire, SAito AND mine "Rcexl" Spark plugs
    Really, not because is my brand but i get 200 rpm more than rimfire and saito spark plugs and a easy starting

    http://www.youtube.com/alephterranova#p/u/4/uXlvWZjEr9o

    Regards
    MAx
    Special Tuned Engines (STengines)

  11. #11

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    RE: Super Tigre ST 3000 Gas Conversion

    I see 3 things I would change. Try a real muffler, put a stack on the carburator, this will stop the blow-by out of the carburator and the engine will be more consistent. Raise the fuel tank to the centerline of the engine. You are trying to draw the fuel up way too far.

  12. #12
    av8tor1977's Avatar
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    RE: Super Tigre ST 3000 Gas Conversion

    Fuel tank level has little to no effect on Walbro or Zama pumped carbs.

    AV8TOR
    If it is not SCARY, it is NO WHERE NEAR powerful enough!!
    All R/C planes have expiration dates---> It's just not printed on them anywhere!


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