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  1. #1
    1QwkSport2.5r's Avatar
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    SuperTigre S90K

    I ran this engine a couple weeks ago and forgot to post my findings.. I haven't seen any other tach readings for this engine on this forum, and I searched all 34 some pages.

    72°F air temp, 75% humidity
    Italian SuperTigre S90K with stock "swing" muffler, clamped the farthest away from the cylinder, and stock ST carb with flat spraybar.
    APC props
    McCoy MC59 glow plug
    5% nitro 20% castor

    13x6 = 12,700rpm slightly rich of peak
    13x4W = 13,400rpm slightly rich of peak as well (This prop had some major balance problems, so I will retest with a different 13x4W prop)

    I have a mousse can for this engine that I'd like to try but need a header for it.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  2. #2

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    RE: SuperTigre S90K

    AMA # 126183
    Fly light, fly fast and fly low.

  3. #3
    1QwkSport2.5r's Avatar
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    RE: SuperTigre S90K

    Macs has a header for $40.. For that price, I'm better off getting a Jettstream for twice the cost and 1/4 the work.. A bigger carb is good for a 1000rpm gain, and the exhaust could see 1000rpm gain.. I guess 15k isnt out of the ballpark for this engine on a 13x6 APC.



    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  4. #4

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    RE: SuperTigre S90K

    A ST 90 turning high rpm like that it will use some serious fuel. Please post your findings.

  5. #5
    1QwkSport2.5r's Avatar
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    RE: SuperTigre S90K


    ORIGINAL: codycarlisle25

    A ST 90 turning high rpm like that it will use some serious fuel. Please post your findings.
    I get about 15 minutes run time on a 16oz tank running on my airboat. I run 5%nitro 20%castor. Break in used about 2oz/min. I will try testing this engine over the weekend again if I have time.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  6. #6

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    RE: SuperTigre S90K

    12x10 APC 12,200 on muffler with minor mods
    AMA # 126183
    Fly light, fly fast and fly low.

  7. #7
    1QwkSport2.5r's Avatar
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    RE: SuperTigre S90K

    I wonder if it could do that with a mousse can and a bigger carb. I've heard swapping in an ASP 108 carb is good for a 1k increase, as is a mousse can of the right size being good for another 1k gain. I have it bolted to the stand, I just have to get around to running it.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  8. #8

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    RE: SuperTigre S90K

    not sure on the OS carb. I just open up the stock carb. Some of the stock carbs can be opened up a lot others cant. If i get another one i will try another carb just to see what the carb swap will offer but to me a 1,000 seems like a very large gain but the engine is a torqer so the small carb may play in to that.
    AMA # 126183
    Fly light, fly fast and fly low.

  9. #9
    1QwkSport2.5r's Avatar
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    RE: SuperTigre S90K


    ORIGINAL: airraptor

    not sure on the OS carb. I just open up the stock carb. Some of the stock carbs can be opened up a lot others cant. If i get another one i will try another carb just to see what the carb swap will offer but to me a 1,000 seems like a very large gain but the engine is a torqer so the small carb may play in to that.
    The Italian mag carb is roughly 9.3mm and the ASP 108 carb is about 11mm. The G90's gain 1k on the 108 carb, so the S90 should do that or better. The S90 is stronger than the G90's from all I've read.

    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  10. #10

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    RE: SuperTigre S90K

    I will look at mine tonight I dont know which one i have. I got the engine in a large batch of engines from chip hyde. It says made in Italy. its pretty old but has great compression.
    AMA # 126183
    Fly light, fly fast and fly low.

  11. #11
    1QwkSport2.5r's Avatar
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    RE: SuperTigre S90K

    I went through and rebalanced all of my props, blades and hub. I decided to re-run them on the engine and see what it felt like turning today.

    71°F / 42% humidity
    5/20 fuel, MC59 plug, APC sport props, stock Mag V carb w/ spraybar "straight in".
    12x7 - 2100 lowest idle rpm / 12,810rpm
    13x6 - 1950rpm / 12,700rpm
    13x7 - 2000rpm / 12,330rpm
    13x8 - 1890rpm / 11,300rpm

    Much less vibration than the last time it ran and the throttle transition is superb.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  12. #12
    1QwkSport2.5r's Avatar
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    Added a Jettstream muffler to the S90, and new bearings. The flogging follows.
    5% nitro 20% castor fuel, McCoy MC59 plug, APC props.

    69*F and 64% humidity
    11x8 13,800/2,500
    11x9 13,650/2,500
    12x6 13,900/2,250
    12x7 13,300/2,200
    13x6 13,300/2,200
    13x7 12,600/2,200
    13x8 11,800/2,200
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.



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