Go Back  RCU Forums > RC Airplanes > Questions and Answers
Reload this Page >

Sleeve has a yellow spot on it?

Notices
Questions and Answers If you have general RC questions or answers discuss it here.

Sleeve has a yellow spot on it?

Old 10-03-2010, 12:10 PM
  #1  
scooterinvegas
Senior Member
Thread Starter
My Feedback: (1)
 
scooterinvegas's Avatar
 
Join Date: Mar 2010
Location: Las Vegas, NV
Posts: 1,278
Likes: 0
Received 0 Likes on 0 Posts
Default Sleeve has a yellow spot on it?

Pulled my sleeve out of my OS 65 LA to take a look at it after running it a little warm last time I flew it. It was lean the first flight of the day, landed and gave it a couple more clicks. It flew fine 3 or 4 more flights, but the cylinder has a yellow goldish spot, and the top of the cylinder is blue. What am I looking at here??
Attached Thumbnails Click image for larger version

Name:	Fc90175.jpg
Views:	9
Size:	135.7 KB
ID:	1510242  
Old 10-03-2010, 04:51 PM
  #2  
d_bodary
Senior Member
My Feedback: (85)
 
Join Date: Apr 2004
Location: trenton, MI
Posts: 1,529
Likes: 0
Received 1 Like on 1 Post
Default RE: Sleeve has a yellow spot on it?


Looks like the nickel is coming off the sleeve








l
Old 10-03-2010, 06:55 PM
  #3  
da Rock
Senior Member
 
Join Date: Oct 2005
Location: Near Pfafftown NC
Posts: 11,511
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

Interesting looking sleeve.

Looks like baked on lube inside. It'll be from black to the gold, and the gold can be very pale and translucent. Look into your muffler and the inside of the exhaust stack. Same stuff only darker.

The areas on the top flange could be where the chrome plating didn't cover. It isn't critical up there and might have been machined off if the sleeve was deburred or finish milled after plating.

When plating fails in the combustion chamber you'd expect to see scoring and the piston would show matching scoring. OS says the sleeve is chrome plated and the piston is aluminum. You'd think the piston would have attracted your attention for sure.
Old 10-03-2010, 07:21 PM
  #4  
proptop
My Feedback: (8)
 
proptop's Avatar
 
Join Date: Oct 2002
Location: Rome, NY
Posts: 7,036
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

ORIGINAL: d_bodary


Looks like the nickel is coming off the sleeve









l
Yep...looks like "O.S. disease"...
Old 10-03-2010, 07:39 PM
  #5  
scooterinvegas
Senior Member
Thread Starter
My Feedback: (1)
 
scooterinvegas's Avatar
 
Join Date: Mar 2010
Location: Las Vegas, NV
Posts: 1,278
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

Its nice and smooth, no deep scratches. I did run it too lean with 10% Cruel Power. I was in the air 4-5 minutes and it started slowing down to maybe 5k rpm at wot. I pulled back the stick and landed it still idling. I let it cool down for a few min, fueled it back up and started it. At wot, it was 1-2 clicks past peak rpm. I retuned it at about 300-400 under max rpm and flew it for a couple of 15min tanks. It seemed to fly fine. Do I just keep flying it?? I dont think $68 to re-sleeve it is worth it. I'll just fly it as is and try and baby it..
Old 10-03-2010, 07:52 PM
  #6  
da Rock
Senior Member
 
Join Date: Oct 2005
Location: Near Pfafftown NC
Posts: 11,511
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

ORIGINAL: scooterinvegas

Its nice and smooth, no deep scratches. I did run it too lean with 10% Cruel Power. I was in the air 4-5 minutes and it started slowing down to maybe 5k rpm at wot. I pulled back the stick and landed it still idling. I let it cool down for a few min, fueled it back up and started it. At wot, it was 1-2 clicks past peak rpm. I retuned it at about 300-400 under max rpm and flew it for a couple of 15min tanks. It seemed to fly fine. Do I just keep flying it?? I dont think $68 to re-sleeve it is worth it. I'll just fly it as is and try and baby it..

"It seemed to fly fine."

And it is fine if that's true. And experience says that no doubt it is true.

You call it "Cruel Power", but you owe it an apology. It is the reason for the "nice and smooth" liner and piston. And of course your quick response to the slow down.
Old 10-03-2010, 08:04 PM
  #7  
scooterinvegas
Senior Member
Thread Starter
My Feedback: (1)
 
scooterinvegas's Avatar
 
Join Date: Mar 2010
Location: Las Vegas, NV
Posts: 1,278
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?


ORIGINAL: da Rock


''It seemed to fly fine.''

And experience says that no doubt it is true.
Really?? I have around 60 flights on this engine, and after this happened, it rolled out the same, climbed the same and had no noticeable difference in speed. I'm here asking for input on the sleeve, not weather I'm telling the truth or not. And the Cruel Power was a dig on my self for putting a mistuned engine in the air with full synthetic fuel in it.
Old 10-04-2010, 09:00 AM
  #8  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

Good grief fly it. trying to rationalize a problem by color on a sleeve is almost impossible but then you said there is no problem. Scoring or flakling is a different matter.

Of course a smidge of castor in your fuel mix as a precaution aginst one of these lean run incidents should always be standard operating procedure.


John
Old 10-04-2010, 09:30 AM
  #9  
SMOKEFAN
Senior Member
 
Join Date: Sep 2010
Location: Gilber, AZ
Posts: 329
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?


ORIGINAL: JohnBuckner

Good grief fly it. trying to rationalize a problem by color on a sleeve is almost impossible but then you said there is no problem. Scoring or flakling is a different matter.

Of course a smidge of castor in your fuel mix as a precaution aginst one of these lean run incidents should always be standard operating procedure.


John
I agree just fly it, and Castor is just cheap insurence. You can buy just as good of a fuel with castor in it as your cruel Power ( which isnt a bad fuel at all ) As the OP posted though he tuned it not the fuel, but CP isnt very forgiving
Old 10-04-2010, 12:21 PM
  #10  
scooterinvegas
Senior Member
Thread Starter
My Feedback: (1)
 
scooterinvegas's Avatar
 
Join Date: Mar 2010
Location: Las Vegas, NV
Posts: 1,278
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Sleeve has a yellow spot on it?

When power master became hard to find, I started to use coolpower. Now that I have PM stocked back up, I was just running out the last of my CP. Still my fault, but the thread was started because of the yellow spot on the cylinder not because of the fuel. No flaking or deep scratches, so I will run it as is and not worry about........ Now if I can just stop worrying about spektrum brownouts! (joking) :-)

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.