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  1. #1
    sodbuster 1's Avatar
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    Hot rodding a Zenoah GT80??

    Can it be done ? If so is there any horsepower gain?
    Is it worth it?

    My dillema is this.
    Looking to buy a plane that is fitted with one but want a little more power than the 80 provides.
    Looked at a few 100 c.c. twins and they won't fit in the cowl.
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  2. #2
    Whistling Death's Avatar
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    RE: Hot rodding a Zenoah GT80??

    This is a Ralph Cunningham specialty. He builds racing engines from GT80's and I am sure he will weight in on it soon.
    Blake

  3. #3
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??

    I had a feeling that might be the case.
    Was hoping he would.
    I lost his contact info....
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  4. #4

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    RE: Hot rodding a Zenoah GT80??

    Ralph would be the man for sure. FYI, the BME 116 is sized not all that much larger than the GT 80, and weighs the same or less.
    Never lie, and never minimize or gloss. Tell it like it is and let the pieces fall where they may. The truth always wins.

  5. #5
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??


    ORIGINAL: Tired Old Man

    FYI, the BME 116 is sized not all that much larger than the GT 80, and weighs the same or less.

    But at 1.5 times the price. Not realy worth it in this ship.'Specially since it already comes with the Zenoah.
    Do you guys know if there's a thread detailing what kind of gains are gotten from Ralphs mods?
    Didn't have much luck on my own finding anything on the threads.
    OR do you know Ralphs current contact info on here?
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  6. #6
    av8tor1977's Avatar
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    RE: Hot rodding a Zenoah GT80??

    He goes by Antique here in the forum. Sometimes he is away at races and such if you don't get an answer.

    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!

  7. #7
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??

    Thanks
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  8. #8

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    RE: Hot rodding a Zenoah GT80??

    Slap one, or two, tuned pipes on your GT-80. That really wakes it up.
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline

  9. #9
    Antique's Avatar
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    RE: Hot rodding a Zenoah GT80??

    GT80s are made to run at LEAST 7000 on the ground so they can get into the torque band..Check out the Toni Clark website for the reason there is no power at lower speeds, the engines are made that way....Our stock GT80 race engines turn 7500 on the ground and about 9000 in the air....28 lb GR7 and other Reno style formula one airplanes, 140+ mph...No mufflers, just short stacks...The prop is a special 2 blade APC.....
    RC Ignition

  10. #10

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    RE: Hot rodding a Zenoah GT80??

    yeah, but wait and see what happens if you fit a tuned pipe to each of them stacks, and tune for sweet spot  between 9,000 and 10,000 rpm! Power in a good setup almost doubles!
    Pe, (www.mvvs.nl), MVVS, MOKImotor, RCexl, MTW, Xoar, Mejzlik.
    Blessing in ignorance? There is sanctuary in analysis.

  11. #11

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    RE: Hot rodding a Zenoah GT80??

    The Toni Clark web site has information on various combinations of the the GT80 www.toni-clark.com/index_en.htm.
    I changed my carb to a Walbro SDC 80, added electronic ingnition, cut the rear crankshaft stub off, & converted to CM6 plugs. I don't expect much performance improvement but it will do what I want it to do. If you're looking for 3D performance, better look elsewhere.This engine makes it power above 7000 rpm. Looks like I'm typing too slow!!!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Tony Hallo

  12. #12
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??

    not looking for 3D performance, but it's powering a 33 lb warbird that only has ground clearance for a 23" prop.
    plane at best does a loop with no umph at the top
    no room for a 100c.c. size motor in the cowl so was hoping I might be able to gain enough performance to at least drive a 23"
    3 blade in the mid 7,000's

    any thoughts?

    trying to decide whether to bother buying this plane or not
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  13. #13
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??


    ORIGINAL: Tony Hallo

    The Toni Clark web site has information on various combinations of the the GT80 www.toni-clark.com/index_en.htm.
    I changed my carb to a Walbro SDC 80, added electronic ingnition, cut the rear crankshaft stub off, & converted to CM6 plugs.* I don't expect much performance improvement but it will do what I want it to do.* If you're looking for 3D performance, better look elsewhere.**This engine makes it power above 7000 rpm.* Looks like I'm typing too slow!!!!

    all I could see is that they sell both the magneto and electronic versions.
    You can buy all kinds of exhaust options and a different intake it seems but that's about all I saw relating to performance.Am I missing something?
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  14. #14
    Antique's Avatar
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    RE: Hot rodding a Zenoah GT80??

    Click on power curve on the left had side.....
    RC Ignition

  15. #15
    All Day Dan's Avatar
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    RE: Hot rodding a Zenoah GT80??

    Tony, I sent you a PM. Dan.
    Dan

  16. #16
    Moderator w8ye's Avatar
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    RE: Hot rodding a Zenoah GT80??

    The GT80 Manual from Zenoah of Japan
    Attached Files Attached Files
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
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  17. #17
    sodbuster 1's Avatar
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    RE: Hot rodding a Zenoah GT80??


    ORIGINAL: Antique

    Click on power curve on the left had side.....
    Ralph,
    Please help me out.
    What does this mean?
    I'm a total layman as far as this chart goes.
    PLUS I don't understand German!
    Are you still doing any work on these?
    Once you go Yak, you never go back......
    EX Club Saito member # 610

  18. #18
    Moderator w8ye's Avatar
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    RE: Hot rodding a Zenoah GT80??

    The same power graph is in the Zenoah catalog. Scroll down to where the GT-80 is to see the graph. If you zoom in on the graph, you can read the numbers in English.

    http://www.husqvarna.com/files/Zenoa...bby_Engine.pdf
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  19. #19

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    RE: Hot rodding a Zenoah GT80??

    My friend has 32 pound Iron Bay Texan, the G62 is more than it needs. He's spinning a 22-10. I would tend to believe the GT 80 would easly fly a 35 pound warbird in stock form.
    Tony Hallo

  20. #20

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    RE: Hot rodding a Zenoah GT80??

    Hi,

    I have a fleet of research planes which have a takeoff wt of 45 lbs and they are powered with a 3W-50 single using a 22 x 8 bolly. At 45 lbs, they will loop continuously (large loops). They are also equipped with very draggy samplers. These planes have flown hundreds of hours.

    I agree that a 35 lb warbird would be overpowed with a zt-80. Prop the engine as Ralph says and you will be fine.

    Elson
    Using this Hobby for Science (aerobiology)

  21. #21

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    RE: Hot rodding a Zenoah GT80??

    What kind of warbird are you talking about. 23" clearance is way to little for any warbird with a gt80. Sounds like you are way under propping the engine. I would expect that engine to use at least a 24X10 or 26X8 prop. I have seen 45lb warbirds fly quite well with the gt80 swinging big props.
    Larry

  22. #22

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    RE: Hot rodding a Zenoah GT80??

    a 3-blade prop in the mid 7000 rpm range needs at least 8 hp to spin. I would dare say that the 80 is no way underpropped. It will have a hard time obtaining these rpm. A two-blade would be OK though, and have no problem with a 33 lbs warbird that needs energy management to loop.
    Pe, (www.mvvs.nl), MVVS, MOKImotor, RCexl, MTW, Xoar, Mejzlik.
    Blessing in ignorance? There is sanctuary in analysis.

  23. #23
    AraTidwell's Avatar
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    RE: Hot rodding a Zenoah GT80??

    That engine is HEAVY! Sell it and get something else!
    THIS PILOT OBEYS THE LAWS OF PHYSICS
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    Science saved my soul
    http://www.youtube.com/watch?v=r6w2M50_Xdk

  24. #24
    Whistling Death's Avatar
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    RE: Hot rodding a Zenoah GT80??


    ORIGINAL: AraTidwell

    That engine is HEAVY! Sell it and get something else!
    Yea that is real good advice, put a lighter engine in a warbird so you will just have to go back and add 2 lbs to get back the weight you needed in the first place. Brilliant.....
    Blake

  25. #25
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    RE: Hot rodding a Zenoah GT80??

    ORIGINAL: Whistling Death


    ORIGINAL: AraTidwell

    That engine is HEAVY! Sell it and get something else!
    Yea that is real good advice, put a lighter engine in a warbird so you will just have to go back and add 2 lbs to get back the weight you needed in the first place. Brilliant.....
    Not to mention a cheap-sh*t clone that weighs less, costs less but also lasts less
    Once that engine is dead, the block of lead will still be there as a reminder of the brilliant decision but the other guy's GT80 will still be running for many years.......


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