RunRyder RC
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2073 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 0s 55 head bolts
02-05-2010 04:39 PM  8 years agoPost 21
brcg123

rrKey Veteran

Wagoner OK USA

My Posts: All  Forum  Topic

once the head loses seal you get an instant lean condition and the piston can get holed very easy in this case. Common problem IF a head comes loose to hole a piston.
and you have had this happen to your engine too? I have never seen this happen from loose head bolts. what makes it burn a hole in it? Its not sucking air into the head, its blowing the air out, which makes it a "rich" condition, not a lean condition, right? It would make it die, from too much fuel trying to burn through the head, not melt down. Im confused on this fact.

Isnt there a lot of pressure (compression) in the head when the engine is running at 17000rpm? and, if you suddenly open the top of the head, your thinking that there will be this sudden gust of air blowing into the head area? come on...the only thing its gonna do is lose compression and die, think about it.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

PM  EMAIL  GALLERY  Attn:RR  Quote
02-06-2010 01:52 PM  8 years agoPost 22
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

I have seen this happen on a friends motor, and heard about it plenty.

the problem is that head loses seal and it's not a problem on the "compression" stroke as it's blowing out air and fuel. The problem is just after top dead center the piston starts to travel down. It then briefly reseals the head ie think suction now, and the remaining air fuel ignite in which is NOW a lean condition. I really don't know how a head can get that loose where it practically falls off the motor but can still seal on the intake stroke, but my buddy told me about an OS50 Hyper he had that started to run wierd, he landed, carried it to the table, the head fell out of the fan shroud No reason not to believe him. He holed his piston that day too. Of course, I've seen him hole a piston running borederline lean, then running too far into his header tank doing autos and then after teh auto flipping out of TH and going wide open throttle and hitting air bubbles at the last of the header too. OS pistons don't take that much punishment before they can get holed. I've also seen exhaust port ring lands chip away pretty easy with very very brief lean runs. YS pistons seem a bit more robust to getting holes or chipping away, but they will melt pretty easy on lean runs and consequently can score liners if the lean condition isn't addressed quickly.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-19-2010 06:05 PM  8 years agoPost 23
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

Os took partail blame. 75 for them to rebuild it. Just in case anyone cares.

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-19-2010 06:09 PM  8 years agoPost 24
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

how "gracious" of them.

What did they tell you? You should have known better than to fly a motor w/out trusting the factory assembled it right?

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-19-2010 06:36 PM  8 years agoPost 25
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

not in that many words but yes

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-19-2010 11:53 PM  8 years agoPost 26
Thumpernator

rrKey Veteran

Senoia, Georgia, USA

My Posts: All  Forum  Topic

And no where in the Engine Manual does it mention to check those bolts.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

PM  EMAIL  GALLERY  Attn:RR  Quote
02-20-2010 01:02 AM  8 years agoPost 27
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

in the Hobbico subsection written in invisible ink that says
We will try to deny any warranty whenever and whereever possible. Thx for supporting our ability to rape and pillage the US customers.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-20-2010 01:52 AM  8 years agoPost 28
fastflyer20

rrKey Veteran

N. Tonawanda, NY

My Posts: All  Forum  Topic

It seems everytime someone sends in an engine to OS, they say operator error and charge $75. That is not a warranty.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-20-2010 02:07 AM  8 years agoPost 29
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

no no

They start at it's totally your fault. $300 to repair

customer... I didn't do it

Hobbico...well out of customer concern we will lower it to $200 or $150

customer... but I don't think I did anything wrong

Hobbico... Best I can do is $75

customer...sweating... They have $300 in the motor that is taco'd. $75 sucks, but I want to have something to show for my $.
Ok fix it.

Hobbico... after hanging up.. chuckles and says to co-workers. Another sucker paying for us to fix a warranty item.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-20-2010 02:47 AM  8 years agoPost 30
Nalizan

rrApprentice

Coppell, TX 75019

My Posts: All  Forum  Topic

ya you need to check them on a new motor. My first hyper 50 I did not check, and a bolt backed out. Engine went lean and it died. Luckily it did not blow a hole in my piston like that. Sorry to hear about your motor.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-20-2010 01:50 PM  8 years agoPost 31
1275mini

rrKey Veteran

Wirral North West U.K.

My Posts: All  Forum  Topic

think i will stick with my TT53 !

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-21-2010 06:55 AM  8 years agoPost 32
Nalizan

rrApprentice

Coppell, TX 75019

My Posts: All  Forum  Topic

think i will stick with my TT53 !
because it's too much work to stick a wrench in 6 bolt holes and twist to verify they are tight? It's a good idea with any motor you buy.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-21-2010 01:26 PM  8 years agoPost 33
1275mini

rrKey Veteran

Wirral North West U.K.

My Posts: All  Forum  Topic

Tight

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-21-2010 05:56 PM  8 years agoPost 34
arfwrecker

rrNovice

modesto cal u.s.

My Posts: All  Forum  Topic

head loose meltdown
It is the nature and beauty of the way a 2 stroke works that makes this happen, any open orrofice be it backplate, loose unsealed carb or cyl head orrofice becomes a carburetor piston goes down intakes air and at bdc piston downstroke loads cyl with the regulated fuel charge and the sucked in air forom the unsealed head. Lean condition at this point the leak becomes a uncontrolled carburetor and motor can run away and lean becomes a like a torch orrofice usually at the point of the leak and it is over like cutting with a torch once you get your matierial hot if you stop the accetylene and leave the o2 your puddle will burn on the o2 and cut without flame. i have had many an os with loose bolts, ck when new run and tourqe when hot is usually the cure.

arfwrecker.

electrons , auto when you want to not have to, love the clean up. Heliproz team pilot

PM  EMAIL  GALLERY  Attn:RR  Quote
02-21-2010 06:09 PM  8 years agoPost 35
lightningrc

rrElite Veteran

UK

My Posts: All  Forum  Topic

OS are known for doing this , when the first C spec 90 came out about 10 years ago that happend to me .

Since then on all my OS bolts I always locktite them and snug them up nice.

I noticed when I went to do this on my Novarossi engines the bolts were already very tight but they also dont use locktite.

Some will say the locktite will break down under the heat but I promise you it will help if its there.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2073 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 0s 55 head bolts
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Sunday, November 18 - 10:33 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online