Help with 46 evolution by hanger 9
 

<span class="Apple-style-span" style="font-family: Verdana, Arial; font-size: 13px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; ">My newest rc- an edge 540 with an evolution .46 engine- is having some trouble starting. i bought the plane used and when i try to start it, either one of two things happen.

1. The plane runs for about 30 seconds on idle and then stutters and slows to a stop.
2. When i try to rev up the engine, about half throttle, the engine stops OR i get to full throttle and the engine starts to stutter, and when i let down on the throttle, it stutters to a stop.

I havetriedto adjust the high speed and low speed needle valves, but the problem stillexistsin the (not so long) long run. When i finally thought i had fixed it, i gave the plane some cool down time. Then i came out to run it again (because i like the sweet sound of the engine) and the priorfailuresoccurredagain! Since the manual says nothing about this, i need some help. Thank You!

P.S. the fuel i am using is 15%.

Other Info:
<span class="Apple-style-span" style="font-family: Arial, Verdana, sans-serif; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; font-size: 12px; ">the edge 540 is made by seagull models. the plane can be found on the following link:Click to find the edge. The glow plug i use is the one that comes with the engine...in other words, it is the stock version. The fuel i am using is Omega Pink fuel(15%). As for the run time, i do not know, but the man i bought it from said he last ran it about 3 months ago. I hope that my questions can be answered soon; flying season is almost here!

-Cookieworks
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RE: Help with 46 evolution by hanger 9
 

you should try with the factory settings on the needle valve (2 1/2 turns I believe).  did you remove the stoppers? that's the first thing to do with evolution engines</p>

RE: Help with 46 evolution by hanger 9
 

Stoppers? what stoppers? Well, whatever they are, they should be removed from a used engine.

RE: Help with 46 evolution by hanger 9
 

<span style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-fareast-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ES; mso-bidi-language: AR-SA" lang="EN-US">the limiters on the needle valves. you should close the high needle valve completely and then open it 2 ½ turns </span>

RE: Help with 46 evolution by hanger 9
 

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RE: Help with 46 evolution by hanger 9
 

checked the limiters. they are removed. The factory settings don't seem to help at all; the engine still cuts out at about half throttle. That is the highest i can go before it cuts out.

RE: Help with 46 evolution by hanger 9
 

<span style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-ansi-language: EN-US" lang="EN-US"><span style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-fareast-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ES; mso-bidi-language: AR-SA" lang="EN-US">

<span style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-ansi-language: EN-US" lang="EN-US">That’s normal; fuel always goes back when you stop flipping the prop

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RE: Help with 46 evolution by hanger 9
 

Welcome to the world of EVO engines.

RE: Help with 46 evolution by hanger 9
 

check your fuel tank for a kinked or plugged up pick up line.check fuel lines for pin holes or kinks anywhere in system.inspect glow plug element for deformation...if so replace it,ensure copper ring seal is under glow plug.ensure you have proper sized prop installed.ensure head screws are tight as well as backplate screws.main needle should be turned out two and one half to three turns out.fire up engine.if problem persists after these steps....check to see if carb spraybar is blocked by removing needle,hook up clean fuel line and blow through it gently,spay bar should pass air,if in doubt remove carb from engine and soak in alcohal for a couple of days to loosen gunk in spraybar and try to clear it out.reinstall eng and fire it up as directed above.happy flying.

RE: Help with 46 evolution by hanger 9
 

by the way...ensure fuel tank longitudal centerline is relativly level with carb spray bar..if not adjust to get it close to level.

RE: Help with 46 evolution by hanger 9
 

Have you watched the fuel line while the engine is running? Is it getting gas, bubbles in the fuel, etc. Have you checked to make sure that there are no cracks or holes in the fuel lines? Remove the fuel line and exhaust line; blow through one while holding your finger over the other to see if the lines and tank will hold the pressure. If you continuously have to blow in the line; you have a leak somewhere. If that is the case; replace your fuel lines and make sure that the tank is not leaking at the stopper or if there is a hole in the tank.

RE: Help with 46 evolution by hanger 9
 

I'm going to second ********nut's advice. 90% of all "engine problems" generally trace back to fuel tank and/or fuel line problems. I had problems with my Tiger Stick a few years ago similar to what is described here. I would start it and it would run fine up to about half throttle. Once I moved the throttle past half way, the engine would rev up then start to sputter and die.

I took the plane home and checked the fuel lines and tank. It turned out that the clunk line inside the tank split. The engine could draw enough fuel up to about half throttle, but anything over that was too much pressure for the split fuel line and it would open up and not draw enough fuel to accelerate.

No amount of messing with the high and low needles will fix something like this. You bought the plane used and you have no way of knowing how old the tank and lines really are. The plane could be fairly new, but the owner might have re-used a tank of fuel lines from an older project. If you can't test the tank and lines completely to your satisfaction, it will only cost you about $8.00 to put in a new fuel tank and fuel lines.

If you get the same issues with a new fuel tank and fresh fuel lines, we can go from there.

RE: Help with 46 evolution by hanger 9
 

If the engine starts, idles for a while and dies out, assuming you have not moved the throttle... then the LOW SPEED needle is set too rich. Turn it in about 1/2 a turn and try again.

If the engine idles, but cuts out as you run it up SLOWLY once it hits about 1/2 throttle or above, then the HIGH SPEED needle is too lean. Open it about 1/2 a turn and try again.


If the engine idles, and runs at high throttle when you bring it up slowly, but then seems to die when you take it back down, and run it up again quickly, then the engine is not transitioning properly.

Usually this is because there is not enough fuel available through the mid-range. When this happens richen (out) the LOW SPEED needle about 1/8th to one quarter of a turn until the engine transitions properly.



Note that transition and idle problems can also be caused by lack of muffer pressure into the fuel tank.

The Evolutions are notorious for developing a grey "goo" or gunk that WILL clog the muffler pressure nipple.

Make a habit of cleaning the nipple out at the start of each flying session. Insert a small hex key that will fit into the opening and move it about to dislodge the crud that forms.

RE: Help with 46 evolution by hanger 9
 

I''m still a rookie at the glow engine tuning, but with this engine being used, might it be a bad glow plug?

RE: Help with 46 evolution by hanger 9
 

Doubtful, but possible.

He was able to get an idle for 30 seconds.

It would be best to tune the engine up and then look at the glow plug AFTER it is running and idling.

Once an engine is getting fairly close to being properly tuned, I'll let it idle with the ignitor installed.

After about a minute of continuous steady idle, I'll remove the glow plug ignitor.

If there is an audioble DROP in RPM's then I'll lean the engine again, re-install the ignitor and try again.

If I can get to the point that removing the ignitor causes almost NO drop in RPM's after this repeated testing, I - KNOW - the glow plug is just fine.

However if there seems to be absolutely no way to keep the same RPM's when the ignitor is removed, after repeated adjustments, then I know that there may be a problem with the glow plug.

That is not necessarily to say the glow plug is bad ( the engine IS running after all!!! ) but it may not be in the correct heat range for the fuel being used.

RE: Help with 46 evolution by hanger 9
 

I had a similar problem with the Evolution 46 trainer engine that was in my Alpha 40. I bought it used and the engine had not been run in a few years. When I talked to the techs at Horizon Hobby they said it was bad berings. I sent them the engine and they replaced the berings and sent it back in a week. I don't remember the cost, but it was cheaper than a new engine and I haven't had any problems since. They sent the old berings when they sent back the engine, and you could cleary see I needed the new berings.

RE: Help with 46 evolution by hanger 9
 

Again, he WAS able to crank the engine over and get it to start to run.

It is unlikely a bearing problem is at play.

RE: Help with 46 evolution by hanger 9
 

opjose,
I understand he was able to get the engine to start and run. I had the exact same symptoms with my Evo 46, the engine would start and run, but would only idle for a short time, and the engine would stop if I tried to increase the throttle. The problem as diagnosed and repaired by horizxon was a bad rear bering. Once the bering was replaced, the engine ran great and continues to run great 3 years later. I was just suggesting maybe a call to the Horizon Hobby techs would be helpful.

RE: Help with 46 evolution by hanger 9
 

I took the plane home and checked the fuel lines and tank. It turned out that the clunk line inside the tank split. The engine could draw enough fuel up to about half throttle, but anything over that was too much pressure for the split fuel line and it would open up and not draw enough fuel to accelerate.


I'm glad bigedmustafa mentioned that. If you do simply take the fuel and exhaust lines off and blow through them as I mentioned; it will not show that there is a problem with the clunk line. The only way that I know to check the clunk line is to take the stopper and clunk out of the tank to inspect. Takes a little time, but could save you a lot of time in the end trying to fix a problem that's not really the problem. My son had the same engine on a Pulse PNP version that was rock solid. Once broke in and tuned correctly; it was unreal (to me). That engine could idle for 5 minutes and still transition from idle to wide open with no hesitation. Usually the 2 strokes will "load up" while idling for longer periods of time and will not transition as smoothly as this one did.

RE: Help with 46 evolution by hanger 9
 

A bad bearing would prevent the engine from turning over properly, introduce all sorts of vibration, etc.

It is likely that Horizon fixed the real problem during the exchange of the bearings, not the other way around.

e.g. a bad seal, carb fitting, etc.

I bet I could have fixed your engine without replacing any bearings.

RE: Help with 46 evolution by hanger 9
 

More information...<div>Hey, guys. Thanks for all of the tips. I have taken into consideration the clunk line being busted. However, I ran the engine earlier today and experimented with the glow igniter. The engine runs fine with the igniter in and i can idle the plane now until the tank runs out of gas (without the igniter). But after taking out the igniter, the engine returns to it's former self. If it is a common problem with EVO's, then there is a way to fix it......right?</div><div>
</div><div>     -Cookieworks</div>

RE: Help with 46 evolution by hanger 9
 

That sounds like a bad glow plug then. Possibly buy an OS A3?

The issues I had with my .46 EVO (six years ago now) was a bunch of crud in the carb. I had to take it all apart to find it and there were some pieces of plastic tubing and UUC (unidentified unwanted cr@p).

RE: Help with 46 evolution by hanger 9
 

If you think you have a clog in the carb, try connecting your fuel pump to the carb inlet and crank a turn or two through the carb, be sure to keep your eyes away from the throat of the carb.

Gary

RE: Help with 46 evolution by hanger 9
 

If the engine runs fine with the glow igniter attached but won't run reliably without it, this is the classic indicator of a bad glow plug. The plug can't maintain enough heat on its own to maintain combustion.

A fresh O.S. A3 plug may be all you need to get your .46 NX running like a champ.

RE: Help with 46 evolution by hanger 9
 

Okay, with that information, i know where i have to go fairly soon.

To the hobby shop for glow plugs! -Cookieworks