OS50SX with a new MP2QL, won't idle or throttle up

[ImRich]

Ok, I must be an idiot! :?

My R50V2 with the OS50SX is running ok with the stock R50V2 muffler.

I purchased the MP2QL (the version for the low gear ratio 8.5-9.0 heli) and placed it on my R50V2.

I fire it up.... all seems ok....

I pull the glow ignitor off... set the heli down to get ready to spin up the blades. Poof.. the engine quits! :(

I did this about 5 times....

Then I left the ignitor on, yes it spools up ok!

I opened a fresh bottle of fuel (just in case)... same problem!

I changed to a new Enya #3 glow plug... same problem.

The only thing I changed with the new pipe was the pipe, and I had to add new fuel tubing for the pressure tap. So I checked the tubing, it was ok. The system will hold pressure with no leaks if I blow into the tubing.

I checked to be sure that the pressure tap wasn't blocked somehow.

What am I missing?

Yes, I rechecked my idle and main needle valve settings. I started where I left off with the raptor muffler. Then I tried 1.5 turns on the main.. then I tried way too rich and way too lean on the idle circuit. I tried higher and lower idle speed.

This thing was flying just fine just 3 days ago with the Raptor muffler.

I have a business trip coming up so it may be a week before I can try this again. The first thing will be to strap on the Rappy muffler again to confirm that all runs well with that muffler as it did before I changed it.

How could the MusclePipe 2 QL to cause my OS50SX to not run?

The engine quits about 1 to 3 seconds after removing the ignitor.

I was running Coolpower 30%.

Any ideas?

[WillJames]

My OS 32 did this same thing when I put the MP2-30 on it. Shannon helped withthe mixture and fixed it. It is your bottom end mixture Rich. I think we had to richen mine a good bit but it was a long time ago, and I don't remember. I never have been a great engine tuner, thank goodness I got help from people who are, really made the hobby more fun for me.

[ImRich]

I tried all the way rich to all the way lean.. and back again.

I would have thought that the engine was too rich, but when lean it didn't help.

I may put on the stock muffler again to see if something else went wrong.

Perhaps the engine ingested some of the RTV I used to seal the pipe to the engine?

If it does the same thing with the stock muffler, I'll quickly know it. That will mean I'll have to take the engine out to inspect every bit.

[Redman]

Pinch the fuel line while it is idleing.
How long before the engine speeds up dies.
If it is immediate, the engine is lean.
2-3 seconds is good
Longer and it is rich

[ImRich]

I did the pinch test yes. it slowly picked up speed (2 or 3 seconds).

Thanks for the suggestion, please keep sending them.

When If ind the cause, I'll let everyone know.

Unfortunately, after today I'll be to busy to work on this until a week later. I hope I'll be able to sleep at night until I solve this.

[ImRich]

Well... :oops: I may be an hidiot! :wall2 (That's a Heli Idiot)

I took off the MP2 and installed my stock R50V2 mufler and had the same problem with the engine dying.

So I decided to try yet another glow plug. I had one of my old favorites around (A K&B 1L) and put that in the engine. Now it started to run just fine!

So now I have to go and reinstall the MP2 and confirm that somehow I had two bad glow plugs in a row. What's the chance of that happening when you're trying to debug something? :roll:

I'll report my findings when I'm done.

[ImRich]

Ok, this confirms it. I had a two bad glow plugs in a row :arggg: (yes, out of a new package). Or I just need a different glow plug as the final plug I grabbed was a K&B 1L. I love those plugs, I don't know if they make them anymore.

I took off the stock R50V2 muffler and replaced it with the MP2 again.

The engine ran just fine. I didn't have room to fly in my front yard, but I hovered out 2 tanks for fuel.

It's working just like I expected it should have in the first place.

By the way, this is the new MP2 50Q LR.

The sound level is about the same as my stock R50V2 muffler during hovering at least. I didn't notice a big difference in sound, but I didn't get out my SPL meter to check it.

Sorry for the false alarm. :oops:

My years of experience would have told me "bad glow plug", and in fact, this is the first thing I changed when the issue first happened. However when a brand new out of the package glow plug reacted the exact same way as the previous plug, it threw me for a loop. Especially since I did not have much time to continue to debug this at the field. Rushing leads to mistakes in judgement!

Now I have to wait a week before I can fly it (just my busy schedule), but at least I'll be able to sleep soundly during the nights instead of wondering what would have sovled this!

[Kinger]

Hey Rich,

Glad to hear you got everything worked out. Please keep us posted as to the performance of the new muffler vs. the standard TT. I've been wrestling with whether or not to purchase a new MP2 for my OS50 on my backup Evo. Something keeps telling me to let more people get time on them before plunking down the cash.

[ImRich]

Kinger,

Thanks! I feel so much better too! It was driving me nuts!

I'll let you know how if flies. I can't try it for a week. :(

[ImRich]

An update on this.

I finally got a moment to get the heli with the MP2 in the air for a test flight. It was only a short flight as I was running out of daylight.

The engine ran fine! I didn't have time to totally tweak the needles yet so I was running rich, but the engine had plenty of power on the MP2 and seemed to transition just fine.

More to follow as I get time to get it tweaked right.

At this point I see no reason to be afraid of a MP2Q

[Matthew]

ImRich

I've had bad glow plugs before. Makes you want to pull your hair out. Two enya #3's were bad out of the package. I'd like to try a K&B plug. is the one your using the one with the idle bar on it?

Matthew

[ImRich]

Hi Matthew,

No, A K&B 1L does not have an idle bar! I also had a bad OS#8.

Right now I'm still flying the K&B 1L, I don't know if they make them anymore. I hope so! After this one wears out, my stock will be gone. At that point I'll try another enya or an OS #8 which is what I was using before this all started.

[ImRich]

This MP2QL seems to fly very nice. It makes good power and is not too 'peaky' as other pipes can be at times.

The hover and idle is no problem.

I'm running 1550, 1750 and 1900 head speeds. The machine really sings at 1900 and is not too loud at all IMHO.

So far (about a gallon of flying) I have had no leaks or other issues with the MP2QL on my R50V2, so I'll give it a thumbs up at this point!

[capebob]

Right now I'm still flying the K&B 1L, I don't know if they make them anymore


Good news. They are still available.

http://www.modelengine.com/price.htm#gloprice

Bob

[ImRich]

Bob,

That is good news! I was at my LHS yesterday and picked up a few more! I noticed that they did not have a lot of them and asked if they were having a hard time getting them, but they said 'not that they know of'.

I guess they are just not as popular as others. But it sure seems like anytime I have a problem with a glow plug in an engine if I put in a K&B 1L, the problem goes away.

I don't know what's different about them, but they sure work for me.

[H2daB]

Two of the guys in our club changed over to the MP2QT and had similar troubles. The biggest problem seem to be leaning out in a decent which limits the 3D capability of the R50V2. This problem was fixed by adding a regulator and check valve. You will need to PM claysmith to get the details. I am still running the stock muffler on mine and it runs great, but has now where near the power of their present setup. Clay can put mine through some hard manuvers that bogs my engine down, where his will keep on screaming.

[ImRich]

HI,

No, I didn't need any regulator! I had a bad glow plug.

Now that I'm using a good glow plug, the MP2 50QL is running just fine! it works well, has good throttle response and has solve the too rich mid range problem which I was having with the stock muffler.

I might add that this is a stock OS 50SX, no mods or adjustments to the engine besides the main and idle needle valves.

[H2daB]

I'm sorry about the imput. I'll try not to do it again. :(

[ImRich]

No problem, it might help someone.

My feeling is that if you have to do something that desparate, than there is some other problem.

I'm very happy with my setup right now.