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Thread: Evolution 91NX


  1. #1
    Dealspeed's Avatar
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    Evolution 91NX

    So I bought a 91nx recently because there supposed to be amazingly light, according to Horizon Hobby they weigh in at 20 ounces with muffler.
    This is a lie! This motor tips the scales at 26 ounces with muffler! Now I have heard horizon has a tendency to stretch the facts but I didn't think it was true.
    Anybody else out there ever owned one of these motors? I know there runners, and the one I bought is in dam good condition and I only paid $90 for it, great compression, bearings look great and the piston has very little carbon on it.Click image for larger version. 

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    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  2. #2
    Moderator blw's Avatar
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    They are supposed to be fairly good engines from what I've read here on RCU.
    The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

    "It's a new day for Auburn" - Gus Malzahn

  3. #3
    Dealspeed's Avatar
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    I watched a video of a guy flying a mojo 60 I think with the 91nx on the nose, it ran very nicely and hucked that plane around with plenty of authority
    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  4. #4

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    My Evo 46 turns 300 more RPMS than my other 46 engines on the same prop and fuel ( ST45-OS46SF ASP46 )
    These engines are overlooked and cheep to aquire
    I have an EVO 53 that has great power bought it new real cheep
    They have true chrome linners
    i am sure the 91 will be a good performer from my experience with other engines in the brand
    Not sure how they would hold up for the long run as that is the true test of the great engines but with a true chrome linner they should hold up real well

    Enjoy
    \" The power and performance glo fuel , 15 % Morgan Omega \"

  5. #5
    Dealspeed's Avatar
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    I've learned the trick with evolution is to get rid of the needle adjustment limiter, the limiters are there to prevent less experienced pilots from messing up the needle adjustments, at the same time it limits those of us with the experience needed to fine tune a engine to run perfectly, once you get rid of those limiters these engines are gems that should last a very long time with that true chrome liner, I expect my 46nt and 91nx to outlast any of my OS engines that aren't ringed.
    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  6. #6
    Moderator blw's Avatar
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    I've been around most of the Evolution 2 strokes and they all need hot plugs like the A3. OS 8 plugs are too cold.
    The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

    "It's a new day for Auburn" - Gus Malzahn

  7. #7
    Dealspeed's Avatar
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    Hmm that's good to know, sometimes my evo 46 is a little timid
    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  8. #8
    1QwkSport2.5r's Avatar
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    .....
    Last edited by 1QwkSport2.5r; 02-17-2017 at 04:02 AM.
    GlowHead Brotherhood #3
    Real engines use glow plugs.
    R.i.P Jacob Wetterling #11 10/22/1989


  9. #9

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    Do you dislike the cardboard box that OS send there engines in Tim ? Maybe the ink is too bright !
    Cheers the pope

  10. #10
    Dealspeed's Avatar
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    Quote Originally Posted by the pope View Post
    Do you dislike the cardboard box that OS send there engines in Tim ? Maybe the ink is too bright !
    Pope don't get him going man, as entertaining as it is
    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  11. #11
    1QwkSport2.5r's Avatar
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    Last edited by 1QwkSport2.5r; 02-17-2017 at 04:02 AM.
    GlowHead Brotherhood #3
    Real engines use glow plugs.
    R.i.P Jacob Wetterling #11 10/22/1989


  12. #12
    1QwkSport2.5r's Avatar
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    Last edited by 1QwkSport2.5r; 02-17-2017 at 04:03 AM.
    GlowHead Brotherhood #3
    Real engines use glow plugs.
    R.i.P Jacob Wetterling #11 10/22/1989


  13. #13
    Dealspeed's Avatar
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    You stand by your opinion and there is absolutely nothing wrong with that, I agree with you on a lot concerning OS, there is very little chance I'll buy a brand new OS ever again unless it's a ringed motor, I've torn down so many of there engines the last few months, so far I've seen peeling in 4 out of 10 engines.

    as far as glow plugs are concerned, I've never experimented much with different brands, I'm quite ignorant when it comes to them.
    Last edited by Dealspeed; 02-16-2017 at 06:13 PM.
    Flyaholick #1 Glowhead brotherhood #98
    Never enough planes to feed my addiction
    Highly addicted to aviation
    Glow will always reign supreme

  14. #14
    1QwkSport2.5r's Avatar
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    Last edited by 1QwkSport2.5r; 02-17-2017 at 04:03 AM.
    GlowHead Brotherhood #3
    Real engines use glow plugs.
    R.i.P Jacob Wetterling #11 10/22/1989


  15. #15

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    Thats the second time in 3 posts that u said u wont post anymore . With kiddies on the way your gonna need more self control !!
    Cheers the pope

  16. #16

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    Quote Originally Posted by 1QwkSport2.5r View Post
    Nah.. Anytime anyone badmouths the almighty OS (or even Saito), some folks' panties get all bunched up and they whine about the guys condemning their gold standard. Wah wah wah. I'll stay out. It's better that way.
    No panties in a bunch here . I dont wear any . Get that picture out of your head !
    Cheers the pope

  17. #17
    Moderator blw's Avatar
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    The only OS that I ever liked was the 50SX. It ran well and was ringed. I had a good friend who bought a couple of them.
    The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

    "It's a new day for Auburn" - Gus Malzahn

  18. #18

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    not another one ! its like a tag team wrestling match
    Cheers the pope


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