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04-07-2012 01:39 AM  9 years ago
Topic Vote0Post 1
tgoodwi2

rrNovice

Port Richey, FL

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OS 55hz blew up
These pictures are from an OS 55hz that just finished its 4th gallon of rotor rage 30%. Looks like the piston ring broke off and tore up the piston and head. Has anyone had this happen? Any other hypothesis of what could be the cause?

Here's hoping that OS will cover this under warranty.

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04-07-2012 02:10 AM  9 years ago
GMPheli

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W. Bridgewater, MA USA

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I would say that has been run a touch on the lean side I doubt it on the warranty
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04-07-2012 02:19 AM  9 years ago
Santiago P

rrProfessor

Dayton

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What plug and how many shims where you running on the head?

If the answer is not OS8 or colder and all the shims that came with the engine...

you did it all on your own.

Is called preignition/detonation gallore.

One good lean run will do the same. Being there.
Looks like you found the perfect needle, and leaned it another turn.

When the ring breaks it does not produces all the golden burned marks you have. Is more catastrophic and clean.
You are showing lots of detonation pitting which eventually causes the piston to cave in. The particles will sieze the ring and cause it to fail.
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04-07-2012 04:04 AM  9 years ago
Jerry K

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Houston Area

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Sorry no warranty for you. How much expirence do you have with nitro motors? I see you are still green, as in 59 days ago.
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04-07-2012 12:12 PM  9 years ago
tgoodwi2

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Port Richey, FL

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Is it the consensus of the group that I had the needles too lean and it overheated? Is that what the brown staining on the piston indicates? If so, then it certainly wouldn't be anything that I could blame os for.

I am new to helis but have been flying nitro planes for years. I am thankful to have found a great group of guys at a club and LHS that have helped me along.
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04-07-2012 12:26 PM  9 years ago
gotnoclue

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sydney

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yeah, way to lean. looks like my 91 SZ piston after the high speed needle backed out, only i blew a hole through that one!

the warrenty that the engines come with is not worth the paper it is written on, the second you crank that motor over they will not cover it. some people go the the extent to take a new motor apart just to check everything first.
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04-07-2012 04:14 PM  9 years ago
Santiago P

rrProfessor

Dayton

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tgoodwi2

The good aand bad thing about the new engines is that they can operate making really good power, being a little rich, dead on needle, or a little lean and sustain that performance for a while, but slowly deteriorating.
The last is what happens to you. This is what one must keep an eye on engine temperature.

Through the years I learned to give a way a bit of fuel and run on the rich side.

Sorry for the loss.
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04-08-2012 02:57 AM  9 years ago
wifeorheli

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reno, nevada usa

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ive had this happen to two motors and it wasnt lean. I had a new main gear on and it sucked some of the break-in dust into the carb and it chipped the piston. I now run pantyhose over the inletNovarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"
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04-12-2012 06:51 PM  9 years ago
CoronaL

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Winnebago IL

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lean run, looks like head became loose around one of head bolts. See crankcase near one headbolt and put that next to the head gasket that shows leak. That will cause lean run FAST, as in good tune one sec, then after leak catastrophic lean condition withing seconds to minute. They will probably not warranty it though.

see my post in other forum explaining better.
Randy!!! I am the liquor
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04-13-2012 03:41 AM  9 years ago
tgoodwi2

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Port Richey, FL

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CoronaL, I can't find the post you are talking about. Will you please post a link.

Thank you for your comments.
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04-13-2012 03:42 AM  9 years ago
CoronaL

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Winnebago IL

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I use a different name in other forum.Randy!!! I am the liquor
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04-14-2012 07:20 PM  9 years ago
corvettercr

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erick oklahoma usa

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had this happen to me with newly rebuilt o.s. 91 hz yesterday, one head bolt loosend up and even with plenty of smoke it went pop. i know what happened even during the auto down. i took the engine apart and chunked it in the trash. this is the second os 91 that has done this to me. i have sence ditched all and now im running the ys engines. yes it could happen tho them aswell but they have better quality imho. ive never destrioed the ys engines. im also running the nv.57 and they rock. killer engine and very powerfull.

anyways back on topic. that was def. caused by a lean run. and yes i think one of your head bolts backed out or in my case stripped out and it sucked clean cool air then went pop.
synergy n9, trex 250,450,600,700
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04-18-2012 08:15 AM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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Is the crank case good still? Is it for sale? PM me if it is good and you want to sell it.

Do the 55 crank cases have sleeves in them that can be swapped out? How hard is it to swap if so?
Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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04-18-2012 01:04 PM  9 years ago
tgoodwi2

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Port Richey, FL

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I rebuilt the engine and it's running great again.
The crankshaft is one piece and does not have a sleeve or liner.
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04-26-2012 10:09 AM  9 years ago
datidun

rrElite Veteran

N Ireland

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Good topic.question is how does one figure out what temp these engines will seize at,with my own experience on a OS hyper 50 with reasonable power from 170f to 200f your safe,about two years ago i had something sucked through the Carb inlet on a Hyper and the Max temp was 230 f on the head,the Piston had a small dent forming,so that was game over.Research shows some of the Pros fly around 220 f on the head,also flew around like that for a while with good power,then when it was time to change the bearings discovering the piston had slight scoring and the Ring starting to go silver in colour indicating a little lean,im thinking 200f max on the head is the deadline.
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04-29-2012 07:31 AM  9 years ago
Cra-Z-1

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Washington,UT-USA

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190 to 200 is what I aim for on my 55HZ.
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04-29-2012 06:04 PM  9 years ago
mickeybling

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dudley wmid england UK

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seems like a lean run from a leaking exhaust sealmickeybling
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04-29-2012 06:18 PM  9 years ago
TMoore

rrMaster

Cookeville, TN

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The OS55 in this case was run very lean for long enough to cook the engine. When you see engines really putting out the power and running like scalded dogs, there are two things that you can infer.

1. The user has an unlimited access to engines and spares.
2. The user really doesn't care how often they have to rebuild their engine.

If you want your engines to last the enduser will have to learn how to adjust the carb needles to a rich level and learn to manage the power available.

I'm not sure that a case can be made that YS is a better engine than an OS. OS makes 50 engines to every 1 that YS builds. The surface finish alone on an OS is considerably better than on a YS but neither engine will run well if mishandled. I've got both and the OS wins the build quality race every time.

I'll say it once more, at a minimum, take the backplate and head off of any new engine and check the internals for swarf, casting flash and debris before you put it into service. Learn to properly torque the heads and back plate and you will be rewarded with an engine that will run well as long as you learn how to tune it. None of them will respond well to mishandling. If you don't know how to wrench on these small engines you will pay the price. Model engines can tolerate a lot but there are limits as you will see. Look at all of the "why did my engine blow up threads" on RR. Do a search and put together the list. It's extensive. Considering the sheer number of OS engines out there, its easy to see why; it's almost 100% due to the "nut at the end of the stick".

TM
Part 107.
The only ZERO flight hour certificate in the world.
It's like getting a driver's license without the driver's test.
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04-30-2012 01:29 AM  9 years ago
Cra-Z-1

rrApprentice

Washington,UT-USA

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Speaking of head bolt torque--I started torquing my head bolts, and was concerned that it was too tight. Where does one find the torque values needed for the head bolts on an HZ55?
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04-30-2012 02:00 PM  9 years ago
reddragon

rrElite Veteran

Brooklyn, N.Y.

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Excellent post Mr. Moore.
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