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Cuyuna

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d-m-hague(at)comcast.net
Guest

Posted: Tue Apr 03, 2007 5:43 pm Post subject: Cuyuna

I hear a lot of comments pro and con about the Cuyuna engines (as used on 

my Ultrastar).  They have a bad reputation, but is it really 

deserved?  Certainly any high revving 2-stroke isn't going to be as 

reliable as a 4-stroke, but were the Cuyunas really any worse than, say, 

the Rotax 2-strokes?  Or was it comparison with 4 strokes, 2-strokes being 

uncommon in aircraft at that time?



				-Dana

--

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The citizens of the United States are getting the government they deserve. 

The problem is that I'm also getting the government they deserve.

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Tue Apr 03, 2007 6:22 pm Post subject: Re: Cuyuna

Yes, Yes, and No  



But dont feel bad, the single cylender dual carb 12 HP crysler engine I had on my first ultralight had a much worse reputation, and I flew it anyways !   If I had your ultrastar with the Cuyuna, I would definately fly it.  The Ultrastar will land really slow,  and should be able to land just about anywhere.   Just practice power off approaches and landings, get your landing skills down pat so that you will be ready when it happens, and try not to fly over unlandable terrain.  There will always be times when flying where you will just be plain screwed if the engine quites, but I try to keep that to a minimum.



JettPilot

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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

d-m-hague(at)comcast.net
Guest

Posted: Wed Apr 04, 2007 3:07 am Post subject: Cuyuna

At 10:22 PM 4/3/2007, JetPilot wrote:

 	  Quote: 	
		  



...If I had your ultrastar with the Cuyuna, I would definately fly 

it.  The Ultrastar will land really slow,  and should be able to land just 

about anywhere...


	


Oh, I've got no problem with flying it, I'm just trying to make sense of 

what to expect.  I had engine failures a couple of times in my T-Craft, 

too, and that had a "real" airplane engine.



                                 -Dana

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--

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The problem is that I'm also getting the government they deserve.

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Apr 04, 2007 3:55 am Post subject: Cuyuna

| Oh, I've got no problem with flying it, I'm just trying to make 

sense of

| what to expect.  I had engine failures a couple of times in my 

T-Craft,

| too, and that had a "real" airplane engine.

|

|                                 -Dana

Dana:



I'd fly under the condition to expect any engine to fail, and without 

warning.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

worrybear(at)verizon.net
Guest

Posted: Wed Apr 04, 2007 4:36 am Post subject: Cuyuna

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GeoR38

Joined: 25 Jan 2006
Posts: 60
Location: The Villages, fl

Posted: Sat Apr 07, 2007 1:11 pm Post subject: Cuyuna

In a message dated 4/4/2007 8:36:35 A.M. Eastern Daylight Time,  worrybear(at)verizon.net writes:

  	  Quote: 	
		  

Dana, In my opinion, the Cayuna with the single Mikuni carb is    very

sensitive to jetting, Once you get the jetting matched to the seasons    and

airplane you should be able to get away with three main jet changes a    year.

You need to pay close attention to the EGT's, too low and you will    foul the

plugs and too high and you will sieze.  If you  don't    have a manual for the

cayuna and mikuni you should get one.



Dan    Walter

Palmyra, PA

Ultrastar, UL202

	


 

 Dana I had a Cuyuna on my pterodactyl and it failed several times and  usually I did not know why, but now I think I do. I had no EGT on the plane and  if I had I would have learned not to let the temps exceed a certain amount based  on the positioning of the EGT probe at the exhaust stack. It almost always  "froze" before bombing me with silence, but as a glider pilot I just flew it in.  Caused me to think of the engine as merely an assist.... a way to bore a hole in  the sky without an extra plane attached.Of course that is the reason why I never  did develop cross country  skills though. 

  

 As Dan says, I think they would have been reliable if the EGT were a part  of the engine. In those '80s almost no one had EGTS.



See what's free at AOL.com. 

  [quote][b]

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_________________
George Randolph
Firestar driver, The Villages, fl

Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sat Apr 07, 2007 1:52 pm Post subject: Cuyuna

My buddy with the FSII/582 in the  hangar next door used to have a Hummer with a Zenoah 250 on it, and a  Mikuni pumper carb. The "main jet" was a needle you turned in and out, ala weed  eater carb. We took some 1/4" vinyl tubing and slipped it over the high  speed needle, stuck the tubing into a 1/4" dowel, more tubing, another dowel,  supported the whole rig with some little brackets, and ran the dowels  forward to just behind the seat, put a knob on the end, where he could reach  back and turn it one way or the other. By watching his egt, he could adjust the  carb so that little Zenoah was always around 1050. It ran like a top. He never  had any trouble out of it at all.

  

 Richard Pike

 MKIII N420P (420ldPoops)

 do not archive

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

d-m-hague(at)comcast.net
Guest

Posted: Sat Apr 07, 2007 4:57 pm Post subject: Cuyuna

At 05:10 PM 4/7/2007, GeoR38(at)aol.com wrote:



  	  Quote: 	
		  Dana I had a Cuyuna on my pterodactyl and it failed several times and usually I did not know why, but now I think I do. I had no EGT... 	


 Friend of mine had a 'dac with a Cuyuna, never had a failure.  My US has both EGT and CHT (on the rear cylinder) and you can be sure I will keep an eye on them.



                                 -Dana

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 The citizens of the United States are getting the government they deserve. The problem is that I'm also getting the government they deserve.    [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Apr 07, 2007 5:15 pm Post subject: Cuyuna

| Friend of mine had a 'dac with a Cuyuna, never had a failure.  My 

US has

| both EGT and CHT (on the rear cylinder) and you can be sure I will 

keep an

| eye on them.

|

|                                 -Dana

Dana:



Hope you have a very quick eye.



Don't recall an EGT or CHT preventing a two stroke failure.  Usually, 

when it happens, it happens so quick the last thing you will think of 

looking at will be the instruments.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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