Evolution engine dies when running full throttle

by Hadi
(Dubai, UAE)


I have Evolution Trainer Power System .46 engine that dies when running at full throttle.


Well actually, my first problem is that most of time this engine starts in reverse. And my recent problem is that the engine die at full throttle.

After running engine for a few minutes, then advancing the throttle from idle to full throttle, the engine does not response quickly. Then it runs for a little while at full RPM's and then just dies...


Matt's Reply: Using an electric starter?

Hello Hadi, It is common for an engine to start and run backwards. This happens more often when starting by hand or chicken stick. Are you using an electric starter? If not, I highly recommend purchasing one.

If this is happening even with an electric starter, it may be because the engine is flooded with fuel. In other words, it was primed too much.

If this is the case, just close the throttle or remove the fuel line and let the engine burn all the fuel out of the engine while running backwards, then try to start it again.

It sounds like your high end needle may be set too lean. Once you give it full throttle try the pinch test. If the engine dies right away, it's too lean and you need to open the high speed a bit.

If the RPM's rise briefly before the engine quits, then it's too rich and you need to close the high speed need a bit.

Good luck, let us know how it turns out.

Comments for Evolution engine dies when running full throttle

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Pinch test
by: Hadi

Hi,

Thanx for your reply.
I have a problem with Pinch test.

When i advance the throttle to full, the engine die and i do not have any time for pinch test.

Also at the idle time, it is not working good!
It has a vibration and i think i should solve this problem first.


I'm using an electric starter.


Thanx,
Hadi

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try startiing over with factory settings
by: Anonymous

Your first post said the engine would run a little while at full throttle before quitting. Now it's quitting right away when you advanced the throttle?

Is this a new engine or used?


Is the engine vibrating badly at idle, or is the engine just running really rough? Like coughing and sputtering?

I would suggest putting both the high speed and low speed needles back to the factory settings. The manual should tell you how. I would also install a new glow plug.

If you still can't get her lined out, see if there is a local club in the area. Those guys would be glad to check it out for you.

Good luck!

Al




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Same Problem
by: Anonymous

I'm having the same problem with my evolution trainer power system. The engine die when I advance the throttle. I tried to adjust both needle and restart many times, but same result.

When I advance the throttle, it seems like there aren't enough fuel going into the engine. I cannot even get the engine to full throttle. Even at half throttle the engine slowly die and stall. It is also hot. This is a new engine.

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same problem-again
by: Anonymous

I tried to use a syring and pump fuel into the engine while its running. I advance the throttle and press the syring even harder. Then I advance to full throttle, and I can see fuel coming out of the muffler. but I stop pressing and the engine immediately die.

I figure not enough fuel into the engine is my problem. And try to adjust the high and low speed needle, but no result. fuel is still not going into the engine enough for full throttle. so it dies.

I need help with the fuel.

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Fuel tank pressure test
by: Haidar

Hi everybody,

When you increase the throttle and before your engine going to die, clog the exhaust instantaneously and see whether the engine dies (repeat this process as many times as needed to prevent engine turns off).

If when you clog the exhaust engine speed temporarily goes up, there is problem with you fuel pressure line, or even the height of your fuel tank needs adjustment. (I presume that you have followed the manufacturers valve setting recommendations).

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reach full power then die after 2 or 3 seconds
by: Rico97

I have got nearly the same issue. I am running an ABC sc46 on a trainer aircraft but I struggle with the full power. Idle is very stable, it reaches full power very well (good transition) but it cannot remain at full power for more than 2 or 3 seconds.

I checked my fuel tank (for fuel line, air pressure), I used 4 different plugs (F5 to F8), I also used different fuel (5% and 16%) and sadly still the same issue.

I tried the pinch test but everything checked out OK. Also I see some fuel going out the exhaust.
It is like if there is not enough fuel supplying into the engine but now I don't know what else I could do.

Please does someone can help me (I spent months on this issue)?

Thanks in advance.

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OS 55AX
by: Dave

Get rid of the EVO, its cheap for a reason.
As the saying goes, "you get what you pay for"!

By an OS 55AX. Will fit anywhere the EVO46 fits.

The OS 55AX will give you trouble free flying and give your airplane a whole new dimension.

I've had lots of EVO Engines. .46 .52 .61 and the 100. They are the dead stick kings of engines. They are finicky and unreliable due to loading up.
The .52 Im still running is the only decent one of the bunch, but Im still leary of it because of the other EVO's.

As far as 2 strokes go. If you want reliability, OS is it. Quality is a bit pricier but reliability is cheaper in the long run.

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Same problem
by: Dan

I have the same problem except when the engine dies the fuel drains back into the tank and losses its prime. Had 6 guys at the feild looking at it for 5 hours. checked everything. took it back to the hobby shop. they looked at it and were sure was the fuel lines. they changed them and still same problem. plane is currently at the hobbyshop as they are stummped!

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tuning problems
by: john

I purchased an Evolution 60 NX right after Christmas last year. After an extensive and probably excessive amount of research, due to this being my first RC engine, I feel like I should have had more success with this engine. As far as the power goes, it did everything that I had expected it to do.

The strange part was, my high speed needle valve was out 4 3/4 turns, and the engine kept running even faster as I advanced it out farther. But my airplane and myself were getting soaked with fuel and oil. When I had tried to slow it down it just died.

Any thoughts? I don't feel like the amount of fuel or oil coming out was "normal". I also shut it down for fear of damaging the engine before messing with any other settings.

Soes the fuel start to separate if it gets to cold? I believe it was around -8 degrees C. If so, this may explain the odd running.

Also, I'm running omega 15% nitro, 17%castor/synthetic blend. I'm using the stock plug(which will likely be changed very soon).

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suggestion
by: Dan

I generally use 10% nitro. Higher nitro will make engine run cooler. I have also been flying with tinfoil around top end of engine but not on the head.

High speed should only be out 2 21/2ish turns. The low speed needle is an absolute pain to set.

I also changed all carb and needle seals and o-rings. I got rid of 3 blade prop and knocked the flywheel off of the prop driver.

Try to keep the 3 blade propeller untill you can land though. The extra blade slows your airplane down quite a bit on landing. But your airplane will fly much faster with a standard 2 blade prop.

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engine tuning
by: john

As far as the propeller is concerned, I currently have an 11x7 on it and I'm 100% sure that I had hit at very least 13000rpm. This particular engine didn't come with a flywheel.

As far as the engine temperature, it was too hot to touch within moments of running. I was holding the exhaust pipe for starting it but had to let go within seconds of it starting up due to heat.

I think the lower nitro may be a good starting point. I'm also gonna have a second look at all the fuel lines just to make sure they are connected properly with no leaks.

Also, why was it that you felt the O rings and needle valve gaskets needed to be replaced? It may just be best to wait till warmer weather comes around to.

I know the way this engine is built, the cylinder is actually tapered towards the top, and since it is really cold outside the parts may be fitting together tighter than intended which may have an adverse effect.

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call evo.
by: Dan

I suggest you call Evolution Engines. I called them and I was on hold for a bit but I was able to get the recommended r.p.m. at full throttle and the engine temp at this r.p.m.

As for the seals and gaskets I changed. I just had a engine that was doing really strange things.


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problem solved, for the most part
by: Anonymous

i figured out what was wrong. It wasn't my fuel or plug or anything. My low speed needle was set so far in that it was restricting the overall flow of fuel. This is why the high speed was out so far.

It would also sort of run low speed with the high speed needle in where it was supposed to be(approx. 2 turns out) but not both at the same time.

I backed the low speed out as far as it would go within its range and now it is working a lot better. It's just a matter of trying to dial it in a bit. No more dieing at high speed or low speed depending on how I set my high speed needle.

As far as why there is so much oil coming out, I think I may just need to find a fuel that doesn't have 17% oil. That seems far higher than it should need to be.

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Fix
by: Dan Wheeler

I have seen this o,n the ego trainer engines. Try removing the exhaust baffle. I know this sounds counter intuitive, but I discovered the pipe was resonating, something probably not designed in, but true. The pressure to the fuel tank runs out at high rpm due to this resonation but works much better without the baffle. A believe it or not moment

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EVOLUTION ENGINES
by: Anonymous

thats the only thing about the preset low and high side needles i see that is a problem with them.take the stops out so that you can check to make sure they are set in the correct spot..i think evolution have good engines,but these stops can cause problems because there have been several set wrong from factory...

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evo rngines
by: Anonymous

A glow plug with an idle (splash) bar may help with the engine when it does not remaining running at idle. This was the solution to my Evo 61 trainer engine.

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Thank you
by: Sam

Hey guys this site is awesome youve really helped me out here with all of your tips and i am sure to come back and visit in the future.

Thank you very much
Sam

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Thanks
by: Matt

Thanks Sam, I'm glad you found the site helpful!

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What size engine has an a on the head .
by: Lynn

Just got a used Glo Evolution engine appears to be about 40 to a 50 size but just has a small a on the cylinder head and crankcase. Do any of you know what size it is? Thanks, Lynn from Belle Plaine, Kansas

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evolution .46
by: steven

I have a .46 and it runs good except at idle will shut off at idle, Tried everything except changing fuels it is in a CMP spitfire so it is mounted upside down i keep the throttle so high that the plane will not come to a complete stop if i turn it down any further it dies any help would be great

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trim
by: Anonymous

set your throttle trim higher. this will probably help you

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evolution evo 100 dies
by: Francois xt

All named coments and methods can be used. This eng runs to ritch from 1/4 to 1/2 throttle. Remove the low speed needle stopper and tune the idle mixer. Advance to 1/3 throttle and set the low end needle. Note about 1/2 a turn leaner should do. Bottom this needle and mark it. Remove needle and sand thick end of the needle until it bottoms 1/2 a turn later. Do not damage the thin end of the needle tip!

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Evo cuts out
by: Getter

Fuel lines going into gas tank were kinked. Unkinked the lines and all is well again with engine running at higher setting. Engine constantly cut out after pushing the limits past half throttle. Now re-mapped all lines to and from gas tank. Works really well. Tanks a bunch!

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Evolution engine dies when running at full throttle
by: Frank O

Same problem,dies, runs on prime only. Problem: piece of crud in the muffler blocking the vent hole used for pressurizing fuel tank, solution: remove crud.Baffle not a problem. Removed purple idle adjuster for easier access to adjusting screw. Startiing from fully closed, opened idle screw 2 turns, high speed 2 and 1/2, start, adjust high speed needle, then idle.

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Cuts out past half throttle
by: LovemyMarilu

Completely changed gas tank and fuel lines. Before replacing all balsa wood and covering I did a trial run to see if that improved anything. The results of the test were excellent. Engine worked beautifully and there were absolutely no more issues with it running past half throttle once new lines were replaced. Used Du-Bro gas tank and junked Sullivan tank.

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