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Thunder Power RC . Mikado Modellhubschrauber . GrandRC

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Engines Plugs Mufflers Fuel > What The Heck Would Cause This???? (Hyper 50)
 
 
TAZZY
Veteran
Location: Westfield,MA

i was running my hyper over the weekend, i got a couple good flights in, then, i decided i want to do one more before it got too windy. i tried starting the hyper, realized it blew a plug, i replaced. i tried starting it again and it would only start at about half throttle, any less, it would quit. so, i left it at 1/2 throttle and brought it to the flight line, spooled it up and it runs great, giving me the power it always used to have before, then, i bring it down just past 1/2 stick and it quits. after playing around with the low speed mixture control, i was getting no where. i dropped the motor and completely disassembled it, and i noticed this, what would cause this????? and there was nothing floating around in the head, and bearings are in good condition, not falling apart.
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GDay
03-21-2006 Over year old.
HOMEPAGE  
 
 
Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

Looks like the engine has been run too hot, and something metal has given up like the rear bearing. I would take the engine apart and inspect every item, my guess is that the engine's toast.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
Trex 500, Mini Titan, Gaui EP200
03-21-2006 Over year old.
 
 
Props-n-blades
Senior Heliman
Location: Aalst, Belgium

You were very lucky !

I had the same happen to my 50 Hyper, only the part of the piston ring that broke off went into the crankcase (bad luck).
Probably, the parts of the piston and piston-ring you lost are still floating around in your muffler. I recommend that you clean it before further use (to make sure none of the parts get into your engine).

I had this after flying on a cold winter day (landing in snow). Not on that day itself but at the next start-up. Maybe the moist of melted snow got sucked in and oxidised the piston-ring, or maybe the temperature differences were too high which made the piston ring grip in the piston. Not sure what it could have been, but I'm also interested to know for sure.
03-21-2006 Over year old.
 
 
Kokamo
Senior Heliman
Location: Liberty Hill Tx

Tazzy

The very first thing that comes to mind for me, is you may have had a peice of trash in your high speed needle. Therefore it would not want to run very good if any at all at an idle. From what you described, it sounds like it ran waaaay too lean for just a little too long. I would assume that somwhow it got the trash in it closer to the end of your last flight and you ended up catching it on the next (the last) flight.

I'd clean it all up, put a new piston/ring and sleeve in it and call it repaired. Also, even after you had cleaned out your muffler AND your fuel tank, you might want to think about putting a fuel filter on the pressure line from the muffler to the tank.....just to be safe.

Good luck man,

Joe
03-21-2006 Over year old.
 
 
TAZZY
Veteran
Location: Westfield,MA

i'm thinking i just ran it too lean.
i've already got the new piston, ring, and bearings to go in it, the sleeve is fine.
thanx

GDay
03-21-2006 Over year old.
HOMEPAGE  
 
 
mylee
Senior Heliman
Location: Rochester, UK

Exactly the same thing happened to mine recently. Nothing in your engine, like you said it's been run to lean. The damage occurs by the exhaust port because this is one of the hottest and stressed parts of the motor. Luckily the top of my piston and the broken ring went straight out the exhaust port and into the muffler. No damage to the liner or other engine parts. I replaced the piston and ring and it's now running fine again.


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03-21-2006 Over year old.
 
 
TAZZY
Veteran
Location: Westfield,MA

couldn't have said it better, i think that's exactly what happened, but since i have it all apart, i'm changing the bearings as well.

GDay
03-22-2006 Over year old.
HOMEPAGE  
 
 
hellflyer
Senior Heliman
Location: Staten Island NY

It looks Lean Or Over heated

The first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
03-22-2006 Over year old.
HOMEPAGE  
 
 
Suki
Heliman
Location: Buenos Aires, Argentina

I had the same problem like TAZZY on my os hyper, I wrote this note to os product support:

I have a OS 50 HYPER engine in a SCEADU EVO, Muscle
pipe 2, fuel 10% nitro, 18% oil blend.
The engine always works properly, rich fuel mix but i
had two incidents, every 6 months suddenly my piston
and ring are destroyed on the exhaust port side.
Could you tell me why this happen, is it a lean
setting or over speed problems in 3d maneuvers, fuel,
etc.?
I donīt know why this happened, the engine back plate
is always cool (high needle 1 1/4 turn)this happened
after 3 minutes inverted fly.

Answer:
If it's scoring on the exhaust port side then it's running lean at some
point. You may want to try going to 23% oil content. Try checking the
temp on the backside of the exhaust port. This would be a better
indicator of what's going.

PD: what is exactly the backside of the exhaust port part and what do you think about this failure??
03-25-2006 Over year old.
 
 
mdm
Senior Heliman
Location: PVD

deja vu

The same thing happened to a friend of mine. While he was flying we heard a loud hissing sound, like the air breaks being released on a truck but the engine continued to run until the metal started to enter the glow plug and kill it. After a few plugs he discovered the same damage. I was amazed the engine ran at all.

he who ha, ha who he.
03-25-2006 Over year old.
 
 
rcadd1ct
Elite Veteran
Location: Richardson, Texas

What did you use to tighten the fan on the crank?

-RCA .......... Making Cuisinarts Fly!!!!!!!
03-25-2006 Over year old.
 
 
mdm
Senior Heliman
Location: PVD

tool

I used a crank locking tool

he who ha, ha who he.
03-26-2006 Over year old.
 
 
rcadd1ct
Elite Veteran
Location: Richardson, Texas

OK.

The reason I ask is that I was asked to look at an engine at the field a while back.

It looked similar to yours.

They used a popsicle stick in the exhaust port to tighten the fan.......bad idea.

Good luck with it.

-RCA .......... Making Cuisinarts Fly!!!!!!!
03-27-2006 Over year old.
 
 
TAZZY
Veteran
Location: Westfield,MA

i take a toothbrush and wedge it between the case and the cranckshaft in the rear of the motor.

GDay
03-27-2006 Over year old.
HOMEPAGE  
 
 
Suki
Heliman
Location: Buenos Aires, Argentina

scored piston and ring failure OS 50 Hyper

Today is the 3°piston and ring broken on the exhaust port side when the engine was at middle range(medium rpm). Two of them in my first engine, the last one in my new os 50 hyper with 10 gallons.
I am using fuel 10% nitro, 18% oil blend plus castor oil (adding castor oil by myself, total oil content 20%)I usualy like to use a rich setting (high needle 1 1/2 turn), you can put your finger on the back plate for ever.
The mixture control screw was 20° to the right lean side
I donīt know was this happen again, I am using the same helicopter, the same pipe MP2, but a new engine and extra castor oil.
I asked to engine support and they said me: It could be that your rings are just wearing to the point of failure. If you are consistently wearing through rings after 10 gallons, you may want to start inspecting them for excessive wear when you get to 8 or 9 gallons and replace if necessary.
I think they are right, because in my first engine I broke the second piston after 10 gallons too.
What do you think about this, same ideas??

01-18-2008 01:38 AM
 
 
captb
Senior Heliman
Location: Arizona Desert

Try adding a extra head shim, might reduce heat and possible deonation.

If it's gonna happen it'll happen up there!
01-18-2008 05:00 AM
 
 
wrobijns
Senior Heliman
Location: Swalmen, the Netherlands

Did you lock the piston thought the exhaust post to screw on the fan?
It looks like you did that and bent something that causes to scratch the piston.
The Piston drops up and down 15.000 times per minute.
The slightest thing wrong can cause disaster.

I did this with my first engine I took apart, a TT70.
It quit on me in flight and it was a mess in there.

Walter Robijns, 3D rules !!!
01-18-2008 08:04 AM
HOMEPAGE  
 
 
Suki
Heliman
Location: Buenos Aires, Argentina

I always use the crankshaft clamp to screw on the fan.
I hope this not happen again, after 8 gallons I am going to check the ring wear....
01-18-2008 12:59 PM
 
 
JEEPWORLD2002
Key Veteran
Location: BLUEBELL PA USA

I think you are adding oit to you fuel and it is causding a lean due to more oil then fuel in the chamber. also try using 20% nitro to keep the temp down with 20 oil try yamaha lube syn oit. 7 or 8 a qt at a dirtbike shop. I would not use the tooth brush I would use a crank lock and also check your fuel line u may have a pin hole in the clunk line that get exposed in mid flight leaning it out. Hod do the con rod bushing look ? are they worn at all. maybe some slop and its allowing the piston to hit the head ???

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
01-18-2008 02:23 PM
 
 
airdodger
Elite Veteran
Location: Johnston USA

It does not matter where the needle is set, that is running too lean period. The best way to tighten the fan is make a tool to keep the fan from turning when you tighten the nut. It does not matter how much oil you have if you exceed the temperature, at which the oil starts to burn. Turn the piston over and take a pic of the inside and post it.

Chris
01-18-2008 07:38 PM
 
 
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Engines Plugs Mufflers Fuel > What The Heck Would Cause This???? (Hyper 50)
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