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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Os 50 Hyper what would be the cause
04-24-2009 02:15 PM  9 years agoPost 1
datidun

rrElite Veteran

N Ireland

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hi after weeks trying to get this os 50 hyper tuned ,leaning it out and making it richer ,the on off pitch sound would not go away ,all was changed rear bearing tubing plugs etc ,today i had another go and a large click sound the heli quite ,had enough and took the engine out and was shocked to see the piston beaten up in the front ,a piece of the ring has gone aswell,including the damage is the inside of the blue head ,im not sure if i can use the head ,please give me your opionion on what you think caused this ,thanx check the photo,s.
fastphoto/36838/os_001.jpg fastphoto/36838/os_002.jpg

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04-24-2009 02:18 PM  9 years agoPost 2
steve 01

rrProfessor

Grand Rapids MI

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It looks like the rod clip holding the piston pin may have come out

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04-24-2009 02:19 PM  9 years agoPost 3
Vance

rrVeteran

York ,PA

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The marks on the piston look exactly like one of the balls from a bearing.
Regardless- you can't use it.
Prolly cheaper to get a new motor.
At the very least you'll need a new liner, piston, ring, head, & bearings.
The rod may have gotten beat up also.
I'd go with a new motor myself.
Vince D

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04-24-2009 02:19 PM  9 years agoPost 4
steve 01

rrProfessor

Grand Rapids MI

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What did the glow plug look like by the way ?and did you clean the engine and pipe before putting the new bearing in ?

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04-24-2009 02:33 PM  9 years agoPost 5
datidun

rrElite Veteran

N Ireland

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thanx for the replies i have had at least 15 flights with the new bearing ,the plug enya 3 has had 4 flights the coil in the plug has been pushed over to one side ,slightly damaged, engine was clean ,muscle pipe was ok aswell

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04-24-2009 03:34 PM  9 years agoPost 6
bbaxter

rrApprentice

Central Illinois

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A deformed glow plug element can mean several things:

1) Engine was run too lean and was detonating
2) Engine was over-revving
3) Engine had foreign objects banging upon it (usually that actually removes the element)

Lean runs and detonation can be caused by: dirt in fuel, a too-lean mixture setting, a too-short tuned pipe system for the RPM, a too-hot fuel for the glow plug used, compression too high for the nitro content in the fuel, trying to run the engine at too high a load (lugging the engine with too much pitch/too-high gear ratio, and of course, air leaks in the engine or fuel system, and vibrating that agitates air into the fuel tank, causing the mixture to go too lean.

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04-24-2009 03:40 PM  9 years agoPost 7
Dwntyme

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U.S.A.

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a lean condition caused the Ring land to break(melt)and got on top of the piston. I've seen this many times with cars that had nitros system in them..

Love a Twitchy Heli.... :) and Remmington Model 700

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04-24-2009 03:45 PM  9 years agoPost 8
baddynergy

rrElite Veteran

sierra madre, ca- usa

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Definetly lean and the rear bearing came apart. The indentions in the piston look just like the ball from the bearing. IMHO, I would salvage what I could for spares and buy a new engine.

**Unattended children will be givin a shot of espresso and a puppy**

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04-24-2009 04:29 PM  9 years agoPost 9
datidun

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N Ireland

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the rear bearing is fine ,idle needle was almost at factory setting ,main needle 1 full turn and a quarter ,back plate was cool ,could keep my finger on it ,fuel tubing new ,carb was clean and flushed out ,fuel filter was new ,clunks were all fine

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04-24-2009 04:36 PM  9 years agoPost 10
rexxigpilot

rrProfessor

Florida

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Ring land broke! No doubt about it.

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04-24-2009 04:39 PM  9 years agoPost 11
holzback

rrKey Veteran

noblesville IN United States

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it does not look like a lean condition, i would think i would see more of a white-grey color, on the piston and head if it was to lean.

is the whole ring there, is the wrist pin still there? go through the whole thing and tell us what is missing, or damaged. example, the front bearing and its condition, the wrist pin, the ring....ect

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04-24-2009 04:50 PM  9 years agoPost 12
baddynergy

rrElite Veteran

sierra madre, ca- usa

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rear bearing is fine
WOW, the dents look just like bearing dents. I would still just get a new engine.

**Unattended children will be givin a shot of espresso and a puppy**

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04-24-2009 05:09 PM  9 years agoPost 13
datidun

rrElite Veteran

N Ireland

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thanx i just took the rear bearing out ,all the balls are there ,i took the rest of the engine to somebody who knows a bit ,it appears to be the piston ring that broke,the little pin that holds the ring in place is still there ,the only thing so far missing is a piece of the ring ,if you look closely at the photo a piece is missing ,he also confirms no sighn of overheating

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04-24-2009 05:13 PM  9 years agoPost 14
tasmanian devil

rrApprentice

DeSoto,Tx.

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Definitely replace engine.It for sure ingested something,does'nt really matter what it was.The fact remains the engine is trashed.

I do'nt crash,I just rearrange parts.

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04-24-2009 05:25 PM  9 years agoPost 15
Tail_BoomStrike

rrKey Veteran

N.A.

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If you're running 30%, you've probably overleaned..... Causing detonation, which busted a peice of the piston, which got may have jammed between the cylinder ports that caused the ring to break as well, for a few cycles, those peices ramained in the the combustioned chamber, got punded several time, before it finally found its way to the exhaust port...... End result, is what you see on that piston and cylinder head...... but then again, that's just my hypothesis.....

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04-24-2009 05:25 PM  9 years agoPost 16
VooDooX

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San Francisco Bay Area CA, US (San Mateo)

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looks like a piece of the ring broke off and bounced around like a ping pong ball inside cratering everything it hit then eventually finding its way out the exhaust i wouldn't be surprised if it was in the pipe you should shake the pipe and see if you hear anything inside

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-24-2009 05:48 PM  9 years agoPost 17
datidun

rrElite Veteran

N Ireland

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piston sleeve is ok ,running 20 percent rapicon fuel ,, when it broke was only at 1600 ,what would make the piston ring break besides heat ,or maybe is it wear and tear old

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04-24-2009 05:51 PM  9 years agoPost 18
VooDooX

rrElite Veteran

San Francisco Bay Area CA, US (San Mateo)

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or a bad ring with a micro fracture or something

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-24-2009 06:08 PM  9 years agoPost 19
VinceY

rrApprentice

Newnan GA

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Any chance you didn't get the ring seated correctly when you replaced the rear bearing?

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04-24-2009 06:44 PM  9 years agoPost 20
Futura57

rrApprentice

UK

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Interesting Rapicon fuel was mentioned. I'm a long term Magnum 20% user, but I ran 4 tanks of Rapicon 20% through my 50 Hyper a couple of weeks back (Pantera 50 + 4 blade head) and the power dropped markedly by the 4th tank. The engine seemed more laboured, but was not overheating. I turned the needle both ways from its long term setting but had trouble tuning it. Maybe it was coincidence and the main bearing and ring needed replacing, I did this as a precaution. To be fair the bearing definitely needed changing. I will go back to using Magnum to make sure it stills runs right, then try the Rapicon again under closer scrutiny, just to be sure. I will also check the clutch liner in case that was on its way out.

Hardware eventually fails - Software eventually works!

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