Anyone,

I have a P-51 Mustang PTS with an Evolution Trainer Power System (EVOE100) .40. I recently had to put on a new body [:@] as well as replace the Remote NV Assy 61NT. Now when I fly it the engine will quit while airborne. I have found that when I hold the A/C nose high at full power like it is in a steep to vertical climb the engine quits in about 30-60 seconds. I found the clunk okay and the tank appears to be air tight. As the engine fails I think I see air bubbles goin through the lines. From what I can tell from reading this and other forums it is either:

To Lean
the needle is not seated airtight

Anyother ideas??

Thanks,

Mike

Well mdfogg probably not the sort of idea you like but if it was me I would attach the engine to a fishing line about a foot and a half above the hook and use it as a sinker. Have seen a few of these engines and they have been nothing but trouble. There are plenty of people on the forums who will howl me down but I would go buy an OS or Thunder Tiger equivalent and replace the engine.

The list of things to check, start with all your fuel lines both inside and outside the tank you should not have any bubbles in the fuel line. It is possible that there is a pin hole size leak in the line and you have not found it. Make sure that your tank is secure and not moving about or vibrating and wrap it in foam if necessary to avoid fuel foaming in the tank. Make sure that the tank is sealed properly and no air is finding itsway in and breaking the seal

If non of these work wind the high speed screw out and richen up the fuel mix and see if that helps, if it doesn't find the low speed idle screw and open that up a little (just a bit at a time maybe 1/8th of a turn. If non of these suggestions sort out the problem go back to 1st paragraph and get another motor.

Bleh...

These engines run just fine once you take off the limiters.

Don't believe those who tell you otherwise when they don't EVEN own one... sheez.


mdfogg:

It's obviously leaning out when nose up.

So the first question is does it do the same at full power when level?

If the answer is no, then EITHER the high end is too lean OR when it is pointed nose up something ( plumbing ) is causing the engine to lean out...

DO remove the limiters not just the "pins" but the whole aluminum collar and screw if you still have them on.

Try pointing the nose up, with about 1/2 tank of fuel in the plane, with the engine running... then CAREFULLY adjust the HS needle richer until you hear the engine slow down just a touch... leave it this way and keep holding nose up for another 60 seconds... It must NOT cut out...

You should NOT get any bubbles until the tank is very low or you point the plane nose down!

Bubbles either indicate an air leak or vibration is introducing air bubbles into the clunk. Did you wrap the tank in foam?
Have you tried one of tho Dubro anti-foaming/bubble clunks which help a lot.

op,

i agree 100% these engines run very well and strong, people say the same thing about magnum and i have 4 that never need need tuning while others at the field have to fiddle with there top of the line big name engines


MDFOGG, you said you had to replace the BODY ? is that the body of the plane or engine ? was it in a crash ? if so you might also have dirt in the needle valves. need a little more info to give better help.

if it hasnt been crashed then check all your fuel lines for nicks, cracks, holes and so on. as was stated turn the HS valve out about 21/2 turns and start from there.




bassman

Mdfogg,

I worked with several Evolution engines and have found no problems with them. My Evolution .61 is one of the strongest running .61’s I’ve ever run. Don’t listen to anybody who says they are boat anchors – they haven’t worked with any of the new Evolution engines.

I too don’t understand what you mean by “new body�. And did you replace the original needle valve assembly with the one for the NT .61? If so, you really should use the correct one for the .45 (the PTS engine is a .45, not .40).

I’m flying a .45 on our club trainer and it’s been chugging along with no real issues all season. I have no idea how much time is on it since it was a used plane that was donated to us, but its enough that it is starting to loose compression and the bearings are starting to make some noise. Several students of mine also have this engine and it’s a great runner – none have had any problems.

If you have bubbles in the line, this is an indication of vibrations getting to the fuel tank. The best remedy for this is to pack the fuel tank in foam rubber and make sure it has as little contact with any structure as possible.

Hogflyer

If the bubbles are between the NV and the Carb, but NOT between the tank and the NV then there is an air leak at the NV or in the line from the NV to the carb (It could be a pinhole that is too small to see, so replace the line since it is the easiest thing to do)

If the bubbles start before the NV, there is either an air leak in the plumbing or you're getting fuel foaming.

If you replaced the entire NV assembly with one from a 61 you will be ok, but if you only replaced the needle itself, that may be a problem.

You can also use one of these as your clunk, it will filter the fuel and not pick up the bubbles nearly as much.

http://www3.towerhobbies.com/cgi-bin...?&I=LXD741&P=7

I agree with last two posts.
I also remember that Clarence Lee posted at former RCM magazine a similar problem. When you see bubbles between the HSNV and carburetor the most probable cause could be vibration (when we certainly know that there is not any air leaks).
Then I certainly would check if there is any air leakage, by replacing the old lines, if the problem persists, even if the engine is effectively tuned, then I would isolate the engine from extreme vibration and even if it is possible, detaching the HSNV from the engine and placing it at the firewall.
Other possible solution could be placing a fuel filter in the line between the HSNV and the carb.

Regards

Alfred.

Gentleman,

Thanks one and all. I will try the different items you are suggesting. And I meant the A/C body. Tried to land the wrong way during a bad wind day. Flipped at 15ft during a nasty gust and it went straight in. Lesson learned. At any rate it appears I need to:

rap the tank
replace all tubing - just to be safe
then mess with the pins if needed.

Hopefully these will do

Thanks again,

Mike

Be sure to replace all tubing inside the tank as well.

One more thing to check that I didn't see but may have already been said is to make sure your nipple in the muffler to pressure your tank isn't plugged. And yes the Evolution is a very good engine, I have 6 of them & thay all run great.

My brother is running 3 Evo. .46 motors. 2 NT's and one PTS version and they all run superb. I had an Evo. .46 PTS and it ran great also but traded it for a .40 Rossi. If you are getting tiny bubbles in your fuel lines and can't find an air leak, you can put a couple teaspoons of Armourall/gal of fuel and no more bubbles. You could also put a fuel filter between the tank and the motor to help eliminate the bubbles also.

Cheers

Curt

Also make sure your prop is balanced.

I've had nothing but trouble with the EVO's I've owned and got rid of them. That includes their .46, 61, and 100NX engines. Some love them. I hated mine. They are gone in favor of OS engines. Sorry, but that's my experience.

Here he goes again Moderator's, This has nothing to do with helping with the problem & This is always his answer (If it's anything but a OS - Bla, Bla, Bla).

And they are not EVO's, That is a total differen't engine. They are Evolution.

The one on the left is Evolution.
The one on the right is Evo.


AMA 191557 - Always Ready

Well, I'll take 'em off his hands, I love them!! Great engines in my opinion