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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 1 tank of fuel OS 50 hyper blows 1/4 inch hole in top of piston
04-27-2009 12:15 AM  9 years agoPost 1
theflyingman2

rrApprentice

Winter Haven, FL USA

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Here is the story: Ive been running a TT redline .53 with a curtis MP5 sb pipe in my trex 600NSP. I just bought a brand new os 50 hyper friday evening, took it to the field saturday morning. I was running it with the curtis pipe also. On the second tank there was a verry loud poping noise and the engine died imediatly. I autoed from about 4 feet and landed. the engine was bariley warm, and wouldn't turn over. We took the backplate off at the field and it had ground up metal shavings all over everything. Apon taking it home and looking through the exhaust port i found a hole in the top of the piston about 1/4 inch in diameter. The glo plug (os 8 that came with it), the coil was messed up pretty bad. I called the hobby shop i bought it from and they said to send it to hobby services.

Has anyone else ever have a 12 hour old engine blow up in less than 2 tanks. My needle was set to the break in setting, this is my second hyper 50. Everone else at the field has hyper 50's with no problems.

Anyone have an idea of what could have happened?

Thanks in advance.

EDIT: I always use my locking tool that uses the connecting rod inside the back plate, I was running 30% RotorRage fuel.

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04-27-2009 12:32 AM  9 years agoPost 2
kraffty

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princess anne md.usa

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I had this happen to me also. Running rich and pop, auto down no problem. The mistake I made was putting clutch on with piston locking tool putting a dent and stressing the piston. I now go thru the backplate. At least thats what I figured it was. I have been running several others with no problems.

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04-27-2009 12:47 AM  9 years agoPost 3
theflyingman2

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Winter Haven, FL USA

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EDIT: I always use my locking tool that uses the connecting rod inside the back plate, I was running 30% RotorRage fuel.

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04-27-2009 01:06 AM  9 years agoPost 4
kraffty

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princess anne md.usa

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There was alot of discussion on this problem a month or so back. Several others had this problem but no real answer. Just alot of speculation.

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04-27-2009 01:14 AM  9 years agoPost 5
kraffty

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princess anne md.usa

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Go back 24 pages here and on 1-17-09 the same problem was discussed.

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04-27-2009 01:38 AM  9 years agoPost 6
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

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i had a redline lock up before even getting it started

MIKADO LOGO 600 TREX 550

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04-27-2009 01:43 AM  9 years agoPost 7
Gearhead

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Vt

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""but no real answer""

I will answer it,,, OS has lowered their standards !!

Jim
Buzz Buzz Buzz

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04-27-2009 01:48 AM  9 years agoPost 8
JuanRodriguez

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The Villages, Florida

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Has anyone else ever have a 12 hour old engine blow up in less than 2 tanks.
Yes..........

Pack up your motor, send it in for warranty service, along with your receipt, and Hobby Services will take care of it......

PS-- That sort of problem happens when your needle settings are too lean...... just thought you should be aware of that for future reference......

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04-27-2009 04:43 AM  9 years agoPost 9
dkshema

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Cedar Rapids, IA

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Everyone else at the field has hyper 50's with no problems.
Right -- maybe not blowing holes in pistons (been known to happen to the Hyper), but if your friends aren't having problems with rear bearings crapping out, you have a very unique set of friends indeed.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-27-2009 05:54 PM  9 years agoPost 10
theflyingman2

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Winter Haven, FL USA

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haha, your right dkshema, we all have those problems lol, i was just referring to problems out of the ordinary. Its funny what we get used to.

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04-29-2009 10:53 PM  9 years agoPost 11
bee power

rrNovice

mexico

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I HAVE SOME TIME YHE SAME PROBLEM BUT NOT IN 12 HRS, MY ENGINES BLOWUP IN JUST 2 MINUTES WITH THE SAME 1/4 HOLE IN THE PISTON AND RICH NEADLE MIXTURE, THE SEALER SEND ME BACK A NEW ONE AND TOLD ME IS A DEFECTIVE ONE ENGINE ..... FOR THAT REASON I'M USING A TT.53 IS BETTER AND MORE POWERFULL.

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04-30-2009 01:53 AM  9 years agoPost 12
AaronJohnson

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mason,MI

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but if your friends aren't having problems with rear bearings crapping out, you have a very unique set of friends indeed.
I have 12+ gallons thru my hyper and my bearings are original and doing just fine. I dont see what the problem is with these bearings. I dont run my headspeeds as high as most would I guess. I run mine at an engine rpm of 17400. I also run the engine dry at the end of every single flying day. store it with the muffler plugged also.

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04-30-2009 12:51 PM  9 years agoPost 13
rcnut

rrElite Veteran

Rockford, Illinois

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I have 12+ gallons thru my hyper and my bearings are original and doing just fine. I dont see what the problem is with these bearings.
At 12 gallons and 1 flight, my piston blew a hole in it as well, 1/4", almost square in shape.

After some conversations about these hyper motors....I replaced the bearings along with a new piston. So far, almost 2 gallons thru, motor is running great. I pulled it out and removed the head, the piston still looks brand new.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-30-2009 03:14 PM  9 years agoPost 14
hampilot

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Sparks, NV USA

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I had a hyper 50 do that. several of the head bolts came loose and I presume that air entered the top of the head causing it to run really lean, and burn a hole.. check the head bolts

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04-30-2009 07:08 PM  9 years agoPost 15
Crewdogg998

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Michigan

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Ham, I can't believe you couldn't fix that A little epoxy and a buffer and you'd be back in business..

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05-07-2009 01:12 PM  9 years agoPost 16
AlexSr

rrNovice

St.Petersburg, Russia

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After installing a new piston in the engine - has made two flights (hovering and simple flight. Rich mixture).
At the beginning of the third flight with increased load on the engine got this :

Never locking by the piston, by connecting rod only!

Sincerely, Alexander S.

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05-29-2009 04:06 PM  9 years agoPost 17
theflyingman2

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Winter Haven, FL USA

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Well, I sent the engine to hobby services. They couldn't figure out how it got lean but they said that it had been run with the needle way too lean. The clicker on the needle was still tight. The decided since they didn't have a clue how it happened they sent me a new one. Thanks Hobby Services. The new engine is rockin with 3 gallons through it so far.

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05-29-2009 09:30 PM  9 years agoPost 18
enahs

rrKey Veteran

Rapid City, SD

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Good to hear you got things squared away now. I would be judicious with checking for air leaks throughout the fuel system. Also, check the head bolts periodically to make sure they are tight. I blew a hole in a piston with the engine running fine prior. Wound up finding a leak in the fuel tank nipple that caused the lean run.

---------
Shane

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05-30-2009 09:16 PM  9 years agoPost 19
lightningrc

rrElite Veteran

UK

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Sorry AlexSr but u caused that blown piston , you can see by the burn marks on the pistion head that you fried that engine

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