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New Evolution Engines!! 15GX, 20GX, 33GX

Old 06-17-2013, 05:55 PM
  #101  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

anybody know why evolution does not want you to use Amsoil in there motors
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Old 06-18-2013, 03:38 AM
  #102  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I've now run all four of the GX series, 10-33 and like them all. The two smaller are good offerings in a small field of players whereas the two larger have a strong field to compete with where any engine must first run well and then have some edge and for the 20 & 33 it might be that they offer gas power without the bark.
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Old 06-20-2013, 04:12 PM
  #103  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I could use some help tuning the 15GX

I set the high speed needle out 1.25 turns as stated in the break-in procedure and started the engine. Ran a tank through the engine as stated switching from 1/2 throttle to idle. at 1.25 turns out the engine runs... however it runs pretty poorly. After the first tank I followed instructions for step 2 which was to set the needle so that you get your top rpm. at 1.25 turns out the rpms are around 5000 at full throttle and very very rich... I don't start getting good rpms until my high speed needle is turned all the way in, at which point I'm getting around 9500 rpm with the break in prop. Its still quite obviously very rich, but I'm not sure what to do from here. The instructions from what I've seen don't mention the default settings for the low speed needle so I have no idea if that is what is off...

After tank 2 I've stopped, since I obviously need some "pro" direction on where to go here. The engine starts easily and seems to run well... but I can't seem to get the high speed set correctly and don't want to damage anything.

Advice?
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Old 06-21-2013, 01:26 AM
  #104  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

If it runs with the needle closed you have an air leak. Contact Horizon, they have excellent customer service.
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Old 06-21-2013, 03:09 AM
  #105  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

About to mount a 33GX on my 1/4 scale super cub. anyone tried hi8s yet. Looks like I have to move the engine forward or fabricate a different muffler.
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Old 06-21-2013, 05:07 AM
  #106  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

+1 on the service.....ive had great response from them...

So...air leak....meaning around the high speed needle valve? I can try to seal that with some tubing and see if that makes a difference.....
ORIGINAL: Lifer

If it runs with the needle closed you have an air leak. Contact Horizon, they have excellent customer service.
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Old 06-21-2013, 06:56 AM
  #107  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

Frank... yes, the muffler requires a sharp break of the fire wall not far below the mount. Take the plane to the band saw... ye-haw.
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Old 06-21-2013, 11:28 AM
  #108  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

tried tubing, same results.
ORIGINAL: mattnew

+1 on the service.....ive had great response from them...

So...air leak....meaning around the high speed needle valve? I can try to seal that with some tubing and see if that makes a difference.....
ORIGINAL: Lifer

If it runs with the needle closed you have an air leak. Contact Horizon, they have excellent customer service.
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Old 06-21-2013, 11:51 AM
  #109  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

If it runs with the needle closed, the problem would not be an air leak but rather trash at the needle holding it from closing all around. Remove the needle and flush and inspect for any debris.
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Old 06-21-2013, 07:06 PM
  #110  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX


ORIGINAL: mattnew

I could use some help tuning the 15GX

I set the high speed needle out 1.25 turns as stated in the break-in procedure and started the engine. Ran a tank through the engine as stated switching from 1/2 throttle to idle. at 1.25 turns out the engine runs... however it runs pretty poorly. After the first tank I followed instructions for step 2 which was to set the needle so that you get your top rpm. at 1.25 turns out the rpms are around 5000 at full throttle and very very rich... I don't start getting good rpms until my high speed needle is turned all the way in, at which point I'm getting around 9500 rpm with the break in prop. Its still quite obviously very rich, but I'm not sure what to do from here. The instructions from what I've seen don't mention the default settings for the low speed needle so I have no idea if that is what is off...

After tank 2 I've stopped, since I obviously need some ''pro'' direction on where to go here. The engine starts easily and seems to run well... but I can't seem to get the high speed set correctly and don't want to damage anything.

Advice?
Set the low speed needle the low speed needle will effect the high speed needle setting.If you had a air leak engine should go lean not rich.Lean low seed untill engine stumbles and wont take throttle then back out untill engine will take throttle.You may have to open high speed needle
after setting low speed .The engine may be to lean where you have it set now.Learn how to tune you carbs.Many posts on RCU on how to set Walbro tyoe carbs. Throw the book away.
BCCHI. Used to be C&H ,AMA 2500
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Old 06-22-2013, 10:22 AM
  #111  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

@bcchi

my problem here was the manual gives 0 indication of what a good starting point for the low speed needle was, so I had no idea if I was in the ballpark, that coupled with a line in the manual that says " the engine will run regardless of if the low speed needle is set correctly or not... meaning you can be extremely far off and still have the engine run, albeit poorly. So I was looking for some defaults as a starting point to make sure it wasn't just set incorrectly at the factory. 

that being said.. I did figure things out and get it running, and running well...

@AA5BY

You hit the nail on the head... pulled off the needle valve and found machine shavings that prevented the needle from seating. Cleaned them out and reset the High speed needle and everything runs great now. Now I'm currently 1/2 a turn out from fully closed and getting right around 10k rpm, decent transition.. took my plane flying and had 5 great flights today. 




The Engine runs well and pulls hard. I have it in a .60 sized UltraSport that weighs 7lbs ready to fly and I'm getting much better performance than I used to get with an O.S. 91 Four Stroke. The one hangup I've found so far is the same issue that others had with the 10GX and the muffler loosening in flight. I need to get some copper sealant on it... I did try tightening everything hot but it still appears to loosen up in flight. Not a big deal for me...
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Old 07-02-2013, 07:36 PM
  #112  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I flew the 33GX again today and am beginning to conclude that the best course for at least the 20 and 33 GX is to rely on a starter. While they sometimes can be hand started with ease, too often they will burn off a choked mixture and not find a condition they are happy enough with to fire up. I've not made the change yet from the 20:1 to a 32:1 mix, which might ease starting difficulties.

They start easily with a starter albeit the 33GX benefits from a Dynatron.
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Old 07-17-2013, 01:45 PM
  #113  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

My Evolution 20GX gas engine powered GP Stuka is almost complete. I am looking forward to the engine break-in and maiden flight.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

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Old 07-17-2013, 04:02 PM
  #114  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

Heli, that Stuka is gorgeous!

Let me ask you all about the Evo ignition units. Do they appear to be advantagous over the RC Exel or other ignition units in any way? Weight? Voltage requirements, advance curve, or? Just wondering if they would be a good replacement ignition for other engines.
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Old 07-17-2013, 04:15 PM
  #115  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

The ignitions are a more compact version of RCexl.
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Old 07-17-2013, 04:27 PM
  #116  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

Well this is a very good thing. What is the input voltage?
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Old 07-17-2013, 04:48 PM
  #117  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

4.8 - 8v
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Old 07-17-2013, 05:04 PM
  #118  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

Well heck, I like these Evo ign. units already. Anyone checked a price on them?
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Old 07-17-2013, 05:31 PM
  #119  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

http://www.horizonhobby.com/products...ne-EVOE10GX#t4

Looks like $70
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Old 07-17-2013, 05:45 PM
  #120  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I put one on my satio FG 20 with the C&H conversion. Very happy with the results.
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Old 07-18-2013, 01:35 PM
  #121  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I completed the odds and ends on the GP Stuka today and the plane is ready for the first engine break-in run. I plan to run the Evolution 20GX gas engine tomorrow.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

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Old 07-20-2013, 06:01 AM
  #122  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I performed the ground break-in run yesterday on the Evolution 20GX gas engine powered Great Planes Stuka. A short clip from the break-in run is shown in the video below. Sorry for the poor quality but I had to shoot the video alone with a cell phone.

http://www.youtube.com/watch?v=0Exj5DvbuF0

Best wishes and good safe flying.

Heli- NuBee (AKA Roger the radial rabbit)
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Old 07-21-2013, 11:10 AM
  #123  
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Default RE: New Evolution Engines!! 15GX, 20GX, 33GX

I had the maiden flight of my Evolution 20GX gas engine powered Great Planes Stuka today. I had two good flights and things went very well. The plane flies quite well and the engine perfomed perfectly. The engine has plenty of power and most of the flights were at about half throttle. So far, I am very impressed with the engine. Sorry but, no video, I just have not been able to find someone locally that can video a flight without all blue sky and sound only.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

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Old 09-18-2013, 10:48 PM
  #124  
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Hey fellas,

I was wondering if anyone had thought/or has jammed the 33GX into the Hangar 9 Taylorcraft. I have the Zenoah G26ei installed currently, but would like a little more oomph so to speak. Plus the 33GX is a tad lighter.
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Old 09-19-2013, 03:06 AM
  #125  
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It is a couple of tads more powerful... but not as easy to hand start. Ought to work well.
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