alright guys let me start with this, last sunday I fly a bird with the engine on her and she was sputtering during flight and then called for a mayday landing which resulted in a blown bird " fixed already." I thought it was the glow plug so I changed her out and tonight I can get it up to 1/2 throttle and she dies hummmm??? I removed the auto restricter on the needle valve and to no luck will it run correctly so i'm at a loss for words. ANY AND ALL ADVICE WELCOME !!!!!! evolution .46 nx never will I buy another 1 nothing but problems mind you the engine has had appx 3 tanks throught it and the engine seems to get kinda hot "ER" than normal

still no resposes yet must not be a popular engine or no knowledge with it

13 views hahahah and no luck yet darn my luck come on guys the weekend is right around the corner and i wanna fly this bird it is a nexstar with 46 nx evolution stock muffler with a 11/6 or 11/7 prop < 1 or the other " wood '' can't get past half throttle with out dying

I would check to make sure fuel lines have no cracks of splits and there are no blockages,
and the tank isn't leaking, then set all the needles back to the factory settings and proceed
with the tuning instructions on http://www.gettingairborne.com/engines.html

ok from the people i have talked to evo engines are far from the best.
i dont own one. you want a response so im giving one, take it w/ a grain of salt
check your idle, to lean?
also you may be either to rich or to lean on the HS needle. set it way rich then transition to WOT. at the same time start leaning it out.
i have a magnum .40 that would do the same thing your stating. did the above to find the actual HS position.
also that prop may be a little big for that engine, try a 10x7 to keep it running cooler when breaking in

you have to go though the troubleshooting of any engine. Some of my student had these and they work ok.
1) check the tank fittings, cracks and pin holes in fuel line.
2) is the fuel tank nipple even with the center of the carb?
3) pull and clean the carb. remove rubber o rings and clean with carb cleaner shootin through all ports.
4)check for air leaks around carb attach point, can seal with high temp rtv, I've had to do this with every tower motor I've gotten.
5) what plug did you use, you need to have a plug in the right temp range. 10-15% nitro would be a med temp plug. 5% a cold plug and 20+ a hot plug.
6)start the engine, lean out the high end needle, if i still doesn't go the full. reduce to idle and pinch the fuel line. if it dies right away richen the low end needle, the flat head screw in the center of the barrel. If it speeds up and dies it's too rich and need to be leaned out. 1/4 turn at a time. With a good pinch for 3-4 seconds it should start to slow down and slowly die. try the high end again.

ok good advice guys keep it coming im willing to try just about anything but taking that motor off, it was a act of god to get it mounted on the nexstar the needle valve set way too far back against the firewall and could not get an allen wrench on it confusing none the less but try to put a evolution on a nexstar plane and mount and you'll know what i mean

permanently mount an Allen wrench and poke it through the side of the fuse. Until you get into scale you don't really get what a hard engine install is

i've done mounted a scale engine i took out the 270 deg motor mount blinds an moved them to 90deg along with figuring out all the etc stuff that was nothing comparded to mounting an evolution engine on a nexstar

this has nothing to do with my original ? just to that smart remark

I fly evolution engines and they fly well once you have them set up. On some engines you can move the needle valve to the carburetor itself. Just take off the back plate, unscrew the cap on the carb and screw in the needle valve. I will check if you can do this with that one.
The biggest problem I have had with these engines is the tuning limiters: small, metal rods that prevent you from tuning past a certain point. Take a pliers and yank them out then tune as you would any other engine.
Start with the high end needle opened 2 turns and pinch test until you have it right.
Oh, and replace the evolution glow plug with an OS no 8. Just works much better.
You can fly these engines very reliably if you set them up right in the beginning.

I had an evolutionwhich lasted about 2 yrs, not many flights maybe around 1gallon.... Inside bearings went and the engine started spitting out metal pieces... Kept running making weird sounds until it decided to die... Also my first and last Evolution... Stupid limiters, low on power and bearings are crap.... I even had an ASP/Magnum/etc which was tons better and had incredible power.... If you want an easy engine get a OS, they run reliably and can take some abuse on settings(needles, plugs)... Wen ou know hat you doing get the cheaper range of engines, same as OS but cheaper and with a little more challenge on tuning... When you think you know about everything in engines get a Super Tigre and start learning again !!!!

I have 2 Super Tigres G90 and after making them run good, any other engine is just kids play....

By your explanation, your engine is lean, at around half throttle its starts needing more fuel and the high speed is not opened enough, it then dies... Also explains why it dies when flying, when the engine unloads on flight it usually goes a little faster, needs more gas and dies.... Try opening half turn, testing and then when it runs full power lift the nose up to 90 degrees and see if it remains constant.... Don't fly until you do that test, because usually when plane lifts from ground the angle is positive and that causes a lean engine to shut off just after takeoff...

I don't usually do pinch test, I first set high needle so it runs well in full throttle, if it sputters its rich, if it dies its lean.... Then after that I set low needle by checking engine reaction when you throttle up fast, if it takes its time to rev its rich, if its too fast or just dies its lean.... Set it around a confortable point where it takes a little to get to full revs....

Gotta go.... and good luck !!

LOL!

So true.

Once you do get them dialed in they are great however.

-

The Evolution .46's run fairly well once broken in.

I haven't seen problems with the bearings, so I can't speak to that, but the limiters are indeed a POS.

I can't say they are low on power though. I've swapped them in to replace an O.S. AX .46, and when using the same prop, I've seen almost no difference in performance.


As you've stated the O.S. ( non-bleed carb ) engines are one of the easiest 2C engines to set up out of the box.

Novices tend to do well with them as a result.




A good idea is also to do a nose up pinch test.

With the plane nose up at full throttle the engine should speed up, but a quick pinch should NOT cause it to shut off. It may briefly slow down though. If so you have it about right.

I had one of the NTs a while back, was horrible and cost me a plane. Vowed to never have one again, well bought one for a trainer for my buddy. Got er used, ran like a bat outta heck[>:]. Got a Evo .52 NX in my great planes cherokee, my lord does she move.... I think that you may have a dud like I first had. Really, I wouldnt suggest giving up, sometimes engines are a ***** to tune,[:'(] nto sure why. Treat em like a woman, some of them youll never even come close to understanding....or was that all of them. Contact horizon and see if they would replace it, you might be supprised.

was just going to say i must have gotten the only good one they made....lmao
been in 3 planes.....currently resides in a 4star-40 11x7x3 prop....flies faster than i care to think.
personaly would set the needles back to factory spec and start over.....
sounds like its way lean

Check to make sure the clunk in the tank didn't fold up in the tank, causing a restriction.

A lot of times it can be a problem with the plane (not a bird, don't know how to get a engine mounted to a bird) . tank location and a little more info can bring in some help, if they see something we know about, its like if I have that plane I may have had a similar problem.

I have a Evol .46 and it runs great, I have heard they are hard to set the carb. I will see if I can get the info and get back.

sticks

i removed the metal clip and gave it a few more clicks to add more fuel and it seems to run better now.  more tests before i fly it

just got back, this is how I was told to adj. the carb.

mine is still running great, have not tryed this yet.



Remove the blue collar

Open the carb barrel 1mm

Close the low end needle, then open it one and one fifth (1 & 1/5) turns

Replace the blue collar so the adjustment lever is centered.

sticks

What Stick 40 said above comes straight from the factory. This is how they are SUPPOSED to be set at the factory, but sometimes they slip through QA with improper settings.

Anyone who has an Evo that is running poorly should do that check first.

I reviewed this engine when it first came out and mine was set wrong. After fussing with it for a few hours, I contacted the MFGR and he told me to do exactly what sticks said.

From that point on, the engine ran GREAT!

    I have 2  evo 46 engines, 11/6 on one and a 12.25/3.75 on the other, both run great. But I also had problms when they were new, Many dead sticks, till I removed the low and high speed limiters, and adjusted the carb like any other 2 stroke.</p>

Throw that junk evo in the trash before it is the cause of a major plane crash. Several of us at our club have tried evolution engines in the past and have found nothing but misery.



I would not take one if you just gave it to me.

Fine, send them to me.

I have several, and if you're willing to take the time to tune them instead of immediately giving up on them and bad-mouthing them, they run great!

For your information...... someone in our club had an evo 100. Almost every one in our club tried to tune this motor over the entire summer last year. This junk motor caused the crashes of 3 diffrent airplanes before he threw it away.</p>

     Then another member had an evo .60 on a trainer that we could not keep running.</p>

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This year a member put a brand new evo 100 in a dragon lady and the plane is now garbage because of the deadsticks.  We found that it had no o-ring under the carb and it came from the factory that way.</p>

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   Ill say it again you could not give any of us one of these engines. i like my airplanes to much to even try a free engine.</p>

This whole thread is about the Evo 46.</p>

There have been some known problems with the 100 so why bring that up here?</p>

Ford made the Pinto, Chevy made the Vega, does that make all Fords and Chevys bad?</p>

Please don't come in here bad mouthing one engine when we are discussing another. Thank you</p>