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CanoMod . A Main Hobbies . Boca Bearings

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Engines Plugs Mufflers Fuel > My OS 50 Hyper got Really, Really Hot!!
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

Was just flying along yesterday and noticed a sound change in the engine, Landed and felt of the back plate and it burned the piss out of me right away. Started looking and the fuel hose from the muffler had broke off and was just dangling. Put it back on and cooled the engine down with a fan in the shop. Took it back up into a hover and 1 fff to recheck the temp. Was still to hot to touch. Could getting it that hot 1 time damage it so fast. Or is there something else im missing? One other thing, I figured the engine would not run with the hose disconnected like that and may have been disconnected all along because i did notice it was extremely hard to start when normally it fires right up. Any thoughts?

If it doesn't fly sell it!
05-06-2008 06:25 PM
 
 
RappyTappy
Elite Veteran
Location: Las Vegas, NV

Yes, one hot lean run can damage a engine. I would keep flying it and keep an eye on it, if you notice less power and it still runs hot or has any other problems you probably will want to rebuild it with new ring. Check the sleeve for any scoring, but using sleeves are pretty tough, its usually the ring and then piston that goes first on a lean run.

Chris
Rex 500
Burning them electrons :D

Forever Brothers
Mickey Tylo
05-06-2008 06:29 PM
HOMEPAGE  
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

With the hose disconnected, it will definately run a lot leaner because of the lack of pressure forcing the fuel into the carb. I have ran engines hot before, and for the most part they were ok afterward. You could take off your muffler and look into the exhaust port for scoring, which is a good indication that the piston and ring have been partitially toasted. You could be running hot now because the bearings got burnt on the hot run and are generating more heat now because they are not turning as free. Either way, probably time to do some maintenace...

Gas is Great
Quick OD 26
05-06-2008 06:30 PM
 
 
MHC
Heliman
Location: Willis, Tx.

Make sure your fuel tank tube is good and not cracked are broken off in the tank.
I had mine go south last weekend and it got hot quick. Replaced the line and all was well.

Mike
05-06-2008 06:31 PM
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

Thanks guys, Read your replies and decided to go have a look. Took the back plate off and all looked brand new. Then noticed the plug in the bottom of the muffler was gone. Put another in and fired her up, Running cool as a cucumber. Wonder how long the plug has been gone? Thinking back now it must have been goon for a few days because thats when i first noticed it was harder to tune. Purrrrrs like a kitten now. Im like sooooo happy now that I dont have to replace my hyper over something stupid I for got to check.

If it doesn't fly sell it!
05-06-2008 07:27 PM
 
 
MHC
Heliman
Location: Willis, Tx.

Glad you got her sorted out
05-06-2008 07:52 PM
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

Glad to hear that you got it sorted out without new parts.

Gas is Great
Quick OD 26
05-06-2008 08:18 PM
 
 
freakyreef
Veteran
Location: usa

Quote 
Then noticed the plug in the bottom of the muffler was gone
Let me guess, a mavrikk high performance pipe?? I just ruined (needs rebuild) a hyper with one. If it is, I would find a way to secure that screw plug better. I noticed their star-lock washer was a rather poor choice.

Evo 50 Hyper, 9CHPS, 9252, gy-401\9254,CSM RL-10
05-07-2008 03:19 AM
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

No, actually it was a century pipe. Never had it happen before but all screws will come loose if not looked after.

If it doesn't fly sell it!
05-07-2008 03:37 AM
 
 
freakyreef
Veteran
Location: usa

I guessed wrong.
I peeked in your gallery and it looked like one.

Evo 50 Hyper, 9CHPS, 9252, gy-401\9254,CSM RL-10
05-07-2008 04:24 AM
 
 
tchavei
rrProfessor
Location: Portugal

Well if its running it didn't get that hot.

I blew mine up at 384F on the head.. now thats hot

Nothing a new liner, piston, ring and o-ring set couldn't solve.

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-07-2008 08:56 AM
HOMEPAGE  
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

Hopefully no internal damage I cant see. I wonder if its better just to buy a new engine than try to rebuild a damaged one? In any event Ill just keep running this one, seems to be fine now.

If it doesn't fly sell it!
05-07-2008 01:43 PM
 
 
tadawson
Key Veteran
Location: Lewisville, TX

A properly rebuilt engine basically is equal to a new one, so I can't see any reason not to repair - it's not like the case wears or anything . . . .

- Tim
05-07-2008 02:02 PM
 
 
tchavei
rrProfessor
Location: Portugal

Oh I had the same question. Ordered a new one but then I was looking at the old one and it was kinda shame of throwing it away so I ordered the parts and rebuild it. Still going strong

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-07-2008 02:02 PM
HOMEPAGE  
 
 
SkateFreak
Key Veteran
Location: Cambs UK/Luton

Hey,
now I know this may seem a little counter-intuitive but when I was learning to tune (i was pretty lazy), I ended up with quiet a few very hot runs... my engine would keep quitting and start to lose power overall...
My brother insisted I re-break in my engine and the power would return and the engine ran great for 2 seasons (ran to lean at least 8-9 times..)

Maybe just richen her up and keep an eye on her i would suggest...

-Jvr
05-07-2008 05:30 PM
 
 
tchavei
rrProfessor
Location: Portugal

Depends on the damage.

Once you have a piston and liner like this, there is no way a re-break is going to fix it.





In this case, it wasn't a foreign object that entered the combustion chamber... the piston got so hot that it started to expand and compress against the liner.

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-07-2008 06:57 PM
HOMEPAGE  
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

Man that piston looks like it was used as a branding iron on cattle! Was that from 1 hot run?

If it doesn't fly sell it!
05-07-2008 09:22 PM
 
 
GMPheli
Veteran
Location: W. Bridgewater, MA USA

I think the piston got so hot that the oil broke down and stopped lubricating. The location is very strange as it is usually the hottest part of the motor, the downwind side of the exhaust port
05-07-2008 10:15 PM
 
 
tchavei
rrProfessor
Location: Portugal

Yes, only one lean run. Engine almost exploded lol

This is what happens when suddently your o-rings let go during 3D... I also have a logged graph of it happening... temperature chart looked like mount everest. It siezed at 194C.

Funny thing is that I managed to start it like that but only above 1/4 stick.

This is why I say that a lean run will kill your engine. One is enough.

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-07-2008 10:31 PM
HOMEPAGE  
 
 
Dilbeck
Veteran
Location: Springdale Arkansas

Well now that were still on the subject, What does it cost to rebuild an OS 50 Hyper, Rings/piston/bearings exc? A new engine is just under $200.00. And how much time is involved?

If it doesn't fly sell it!
05-07-2008 11:19 PM
 
 
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Engines Plugs Mufflers Fuel > My OS 50 Hyper got Really, Really Hot!!
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