Idle speed load-up on Evolution training system .46 engine.

by Dennis
(Kansas City, MO)

I have an Evolution training system .46 engine.

After landing at Idle and low power taxi, the engine comes up to about half RPM and dies due to loading up.

My mentor and his friends have tried adjusting the needle valves numerous times. I have upgraded from 10% nitro to 15% nitro which helped but no permanent solution.

I have installed a glow plug with an idle bar which again helped but no permanent solution.

I'm getting tired of landing dead stick and so are 2 other folks at my field running the same engine.

One of the guys has gotten fed up and ordered a different brand engine.

Any ideas?

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Idle speed load-up on Evolution training system .46 engine.

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idle issues
by: Anonymous

End all your engine problems. Use Super Tigres. Excellant bang for the buck. The ringed engines start easy transition well and have more than enough power for its size, whatever that may be. If I buy any new engines ST always gets the nod. Oh and by the way they run for what seems to be an eternity.

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reset low end and use O.S. #8 plug
by: Matt

Hi Dennis,

I have a couple of Evo engines myself. I like'em!

The low end needles is supposed to come set from the factory. Many people have discovered that they are not set correctly. Here is what to do.

Remove the blue collar.
Then close the barrel until it is 1mm open. Then close the low end needle all the way, then reopen 1 1/5 turns. See if that helps.

A few guys at my club as well as I have found that the evo 46 runs a lot better with an O.S. #8 plug instead of the factory Super Plug. You may want to give O.S. #8 plug a go and see if that helps also.

Are you doing the pinch test to check the high end? You definitely need to do that.

If you follow those steps and you should be good to go. Let us know how it turns out.

Good Luck!

Matt

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Thank you
by: Dennis

Thanks Mat, I'll try that. Yes I'm doing the pinch test and can get the high end set well but it seems to be a problem at the low end. I'll try your remedy and see how that goes.

Thanks again.

P.S. Before the engine was broke-in, it ran like a champ. After a few hours, this issue arrived.

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load up
by: Eric

I would also try taking off what I believe is called a prop drive or as some would say the thing that the prop gets pressed to on the back of the shaft. The one that comes with the engine is weighted and you might have trouble especially if you change to a two blade prop.

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Evo 46 load-up
by: Anonymous

Hi Dennis,

I have the same trouble with a .46 NT/NX. An O.S. #8 definately helped, but still loads up after idling a while (usually within the time it takes to taxi to/from the active runway). The low-speed needle seems super touchy. Me and about 4-5 different guys at the field fiddled with the low-speed needle for about an hour and a half before we got it running/transitioning comfortably enough to fly it. Seems like it's very difficult to adjust the low speed needle to the point you get a good transition without it loading up at low throttle settings.

In order to keep it running, I stopped several times during taxiing and applied full throttle to get rid of all of the junk building up in the engine. I didn't fly with anything less than 1/2 throttle until I was ready to land. I'm running 10% omega and the engine is mounted horizontally.

I'm stumped. I haven't yet tried a different carb on it to see if that helps.

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Bumping
by: Jesse

Hey, when taxiing try bumping the trottle to full for about a second to burn off the load up. Do this until your lined up and ready to roar!

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Original poster comments
by: Dennis

Thanks to everyone for all your comments and suggestions. I have tried almost all of the suggestions and was still having problems.

After some local research at 4 airfields I found that out of 11 Evolution training system .46 engines, 4 were replaced with other engines due to similar or worse problems, 2 had some problems but were dealing with them, and 5 just loved the engine and have never had a problem.

I guess it's just the luck of the draw. Personally I shelved mine and got an O.S. Max.

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Evolution deadstick
by: Anonymous

Do NOT us and o.s. #8 plug! The evolution has a longer plug. Use either the hangar 9 plug or McCoy #8. The shorter plug is recessed and fuel will pool up in there and put out the glow wire. I had the same problems.

Next spend some time adjusting the low speed needle valve. Once you get it adjusted right you shouldn't have any more dead stick landings. If you don't know how to adjust it get help or look on line.

Just make sure you adjust it when it isn't running and only move it slightly like no more than an 1/8 of a turn. Then lock the collar on it so you still get a 1/4 turn adjustment from your settings.

Also check for leaks at the remote valve, pinholes in the fuel line and loose exhaust can. About 4 of us at the club had the same issues.

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Evolution not !!!!
by: Anonymous

Mine is doing the same thing .
It's coming off and going to a swap meet.....

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Gave up and replaced
by: Anonymous

I have long since threw the Evo motor in the trash and replaced it with an O.S. 55 and I dearly love it. Just set it and forget it. Runs like a dream, or as some of my friends say, it runs like it should.

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