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  1. #1
    seanychen's Avatar
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    Moki 1.8 performance

    I ran my Moki 1.8 w/ 5% nitro Sig fuel (10% castor 10% synthetic), OS #8 plug, and have rpm and thrust reading.

    APC 18x6W: 9400, 19.1 lb thrust
    Pro Zinger 18x8: 8500, 17 lb thrust

    I measured the thrust with a digital force gauge by hooking the hook no the gauge to my tail wheel vertical axle.

    My plane is Kange Cap 120, weighing 13.5 lb w/ the Moki. A little heavy I feel. But I have a WM female pilot w/ hair, 3 1/4" wheels, 3/16" axle, wheel pants, large volumn BCM Pitts muffler. Could get down to 13 lb if I go ugly.
    E_Total = M*G*H + 1/2 M*V^2
    When H=0, all of airplane\'s velocity becomes crash energy!

  2. #2
    Shortman's Avatar
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    RE: Moki 1.8 performance

    Hmmm...

    I am running my Moki 180 on a Bambula 18 x 8 wood propeller and homebrewed FAI fuel with 18% oil content. Have yet to tach it or do any thrust readings but it pulls my Hanger 9 Edge 540 around like no tommorow.

    Steven
    Steven Carroll
    AMA# 738035
    www.cafreestyle.com
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    \"The more you know, the more you know you don\'t know.\"

  3. #3

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    RE: Moki 1.8 performance

    Moki 1.80 with mezjlik 18x8 running on home-brewed FAI fuel with 18% oil, 9000 rpm max and 8700 rpm for flying.
    TD

  4. #4
    Cheech's Avatar
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    RE: Moki 1.8 performance

    Mejzlic 19X8 propeller. Spins at a solid 7700 RPM.

  5. #5
    seanychen's Avatar
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    RE: Moki 1.8 performance

    I pinched one of the BCM Pitts muffler's exhaust stack to give more back pressure. I ran it again today with Wildcat 5% fuel. Peaked at 8700 rpm w/ Pro Zinger 18x8.
    E_Total = M*G*H + 1/2 M*V^2
    When H=0, all of airplane\'s velocity becomes crash energy!

  6. #6
    JoeAirPort's Avatar
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    RE: Moki 1.8 performance

    I get 8400 on a Bambula 18x8. It peaks out at 8700 then I richen it up.

    That's Morgan FAI fuel, K&B 1L plug.
    Joe AP

  7. #7
    seanychen's Avatar
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    RE: Moki 1.8 performance


    ORIGINAL: JoeAirPort

    I get 8400 on a Bambula 18x8. It peaks out at 8700 then I richen it up.

    That's Morgan FAI fuel, K&B 1L plug.
    Looks like the Bambula 18x8 is the same load as Pro Zinger 18x8. I shall give it a try.

    By the way, I tached the Moki 1.8 w/ Pro Zinger 18x6 on 5% Wildcat fuel, peaked @ 9200 rpm.
    E_Total = M*G*H + 1/2 M*V^2
    When H=0, all of airplane\'s velocity becomes crash energy!

  8. #8
    RCAddiction's Avatar
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    RE: Moki 1.8 performance

    Homebrew:
    Racing Methanol
    0% Nitro
    22% oil, consisting of 75% Klotz synthetic/25% SIG Castor

    Glow Plug - K&B 1L
    Muffler - Bisson Pitts - both pipes fully open, using muffler pressure
    Engine completely broken in

    Peak Readings - TNC Tach
    19x8 MenzS - 8800 rpm
    18x8 Zinger standard (not Pro) - 8900 rpm
    Lee

  9. #9

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    RE: Moki 1.8 performance

    Brand new Moki 1.8 using FAI fuel (80% meth + 20% BeNol) spinning a Bolly 19x8 CF prop delivers a solid 8100rpm and peaked to 8400-8500 rpm on the bench after 2Lt break-in. Wow this engine delivers some thrust and it's so easy to start on a back flip provided that Moki plug has to be cranked up to about 4amps. On the bench it's a dream, we'll see how it goes in the plane (GSP/CMP Katana 72") this weekend.

  10. #10

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    RE: Moki 1.8 performance

    Anybody ever notice a sucking noise when priming their Moki? I have a 210, and two friends have 180s. They all seem to do it. Either gone or much less when hot.....sucking air through front bearing? One of the 180s has new bearings in it, still does it.
    thanks,
    jp

  11. #11

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    RE: Moki 1.8 performance

    Yes I noticed that noise and the unhealthy looking dribble of fuel that flows from the front bearing when the engine is too wet. It doesn't seem to adversely affect the engine's performance. The Moki is one of the best (ease of starting, power, idle, transition) engines I have ever had the pleasure of using. I guess that we just put up with a little mess and that sucking sound from the front bearing.

    On a different topic, are people using the Moki gold plug that comes with the motor? I found that it requires a lot of current (4amps) to get the engine to fire - not a bad thing just an observation. Probably because the actual element is quite a bit thicker than my usual OS#8. The Moki plug is giving me very reliable long idle periods (tested to 5 mins) with instant transition to full throttle, plus good RPMs (over 8400 on Bolly 19x8) on 0% nitro. I hear so many people prefer the OS FS plug - why?

  12. #12

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    RE: Moki 1.8 performance

    Moki 1.8 /bisson pitts with exits 12 mm diameter and no nitro. apc 17/12 7900

  13. #13

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    RE: Moki 1.8 performance

    1.8/ bisson pitts 12mm exits meijnik 18/8 8600 no nitro

  14. #14

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    RE: Moki 1.8 performance

    What plugs do you guys use?

    OS F Plug?
    Gold Plug?
    OS 4 Plug?

  15. #15

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    RE: Moki 1.8 performance

    k&b1 plug. I have found this plug to give me better idle and about 3 more rpm on the top end.

  16. #16

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    RE: Moki 1.8 performance

    k&b1 plug is that the gold plug? does anyone know what plug is the one that comes with the engine?

  17. #17

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    RE: Moki 1.8 performance

    OS "F" and no nitro

  18. #18

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    RE: Moki 1.8 performance

    I use OS#8, straight fuel, oil edl 18%, Zinger 20 x 8, 7600 rpm.

  19. #19
    BOLTMAN's Avatar
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    RE: Moki 1.8 performance

    Moki 1.8, OS #8, 15% Coolpower, 5% nitro, Bolly 20x8 Prop.

    No tacho to take readings, but I find this setup spot on for hauling warbirds from 19lb up to 25lb.

    Cheers
    I don't have a flying problem, I can quit flying anytime I like.................

  20. #20

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    RE: Moki 1.8 performance

    Hey guys,

    Not sure if this thread is still going..... but i need some help, Just running in my Moki 180 with a 20x10 wooden prop, its to big and i am going to an 18x8 (seems to be popular)
    I was wondering - does a mezjlik 18x8 have the right size hole to fit onto a Koki shaft - or does it need to be reamed out?

    Cheers

    RJ

  21. #21
    allied's Avatar
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    RE: Moki 1.8 performance

    O.K. quick question, anyone have an opinion or experience on mounting orientation w/the 1.8. Upright, horizontal, or inverted. I need it inverted on the plane but horizontal could work with a little cowl cutting.
    Thanks
    Dean
    If your scared to break it then go home!

  22. #22

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    RE: Moki 1.8 performance

    The only operational difference is in starting the engine. It is easy to prime when the engine is mounted from upright to laying on its side. Inverted mounts are impossible to get primed for a simple bump start, if a starter is used then it makes no difference.

  23. #23
    allied's Avatar
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    RE: Moki 1.8 performance

    Thanks, I wasn't sure, I hve had ASP's that would almost refuse to tune in an inverted configuration and just wanted to ask someone who had a Moki if they were like that.
    If your scared to break it then go home!

  24. #24
    JoeAirPort's Avatar
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    RE: Moki 1.8 performance

    It needs a 10 mm through-hole with a 12 mm ream at the rear of the prop, 5 mm deep. Or you could just ream it 12 mm all the way, I didn't like doing that so it could fit other engines. Standard bore on almost all large props is 10mm.

    The Mezjlik will fit fine but you will need a 12 mm reamer to make it fit the aft part of the prop bolt. You want about 8400 RPM's with that engine. I used a Bambula 18x8 and it really pulled the plane hard in verticals. The Mezjlik will likely turn around 9000 since the paddle area is a lot less than the Bambula. Not a bad prop. You could save a bunch of money and just get a wood Airwild NX, Menz, or JFX 18x8 prop. They all would run well on that engine and are much lighter than the CF.

    ORIGINAL: kainisrj

    Hey guys,

    Not sure if this thread is still going..... but i need some help, Just running in my Moki 180 with a 20x10 wooden prop, its to big and i am going to an 18x8 (seems to be popular)
    I was wondering - does a mezjlik 18x8 have the right size hole to fit onto a Koki shaft - or does it need to be reamed out?

    Cheers

    RJ
    Joe AP

  25. #25
    JET FX's Avatar
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    RE: Moki 1.8 performance

    Hi guys, Just looking for some feed back.... I have just been running a Moki 1.8 for the first time (for me) the engine came with a nice 1/5 scale Spitfire model I purchased second hand with plenty of flights already logged. Anyway after running up Moki to check performance all seems just fine and ready for flight, But I just noticed some for/aft play in the crank, I would say approx .5mm approx maybe a fraction more play, there does not appear to be any lateral play at all just slight for aft play with prop and spinner on correctly and tight enough...... does this indicate a bearing is worn out??? any advice welcomed.

    Cheers- Marty


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