After run Oil

[Dean Pappas]

I agree with Eric ...
I have seen more wiped cam followers and abused cams than you can shake a stick at, and I believe that most of it happened in the first minute of running a new engine. Once the surface galls, it wears differently for many hours of running. A good pre-lube in a new engine is an excellent idea, especially with the DZ not having raw fuel in the crankcase. The same oil as used in your fuel would also be good. Don't try any automotive cam pre-lube: it usually has moly-disulfide and will mess up glo-plugs and running until it washes out of the enginne. Don't ask how I know!
Regards All,
Dean

-----Original Message-----
From: Henderson,Eric [mailto:Eric.Henderson at gartner.com]
Sent: Tuesday, November 18, 2003 10:29 AM
To: discussion at nsrca.org
Subject: RE: After run Oil


The interesting thing about using Mobil -1 as an after-run oil is that it really behaves like a before-run oil. - more on that later.
 
One thing that I noticed on YS's is that when we run them dry of combustible fuel we forget that there is fuel still in the cup portion of the piston if we are running inverted. It is a good idea to run the engine out with the engine upright. If you run it dry inverted, it will always give you one more pop if you try it again the right way up. 
 
The best way to protect a YS is to treat before the first run. A tear-down looking for ali-crud is always a good idea. Then just smear everything with Mobil-1 on reassembly.
 
(As an aside my YS 1.10 spit a prop this weekend without warning. The culprit was a chard of aluminum stuck in the silicone poppet valve in the regulator. This caused fuel to leak to the carb. Tightening down the regulator stopped that happening, but when the piece fully embedded itself it then had a good seat-seal and caused a very lean feed to the carb. - Will check for that next time)
 
If you use Mobil-1 you will find that it does not mix with the fuel. It will cause a good smoke cloud and mess with the initial run of the engine.takes about 60 seconds to burn it all out. I believe that during this burn-out that is when it does the most good to the engine. Mobil-1 appears to get into the "skin"  of metal such as crankshafts and definitely has kept my bearings in good shape.
 
Regards,


Eric.
 
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Bill Thompson
Sent: Monday, November 17, 2003 7:48 PM
To: discussion at nsrca.org
Subject: Re: After run Oil


Terry
What you just said is what I have been doing since the late 80's. I asked the question because three or four people told me that I am killing my engine's. I replaced my bearings after over 200 flights no rust and just like you said it was to make me feel better. I am running 25% Cool Power synthetic. Thanks for your help.
 
Bill Thompson
AMA 7703 

----- Original Message ----- 
From: Terry Brox <mailto:tbrox at cox.net>  
To: discussion at nsrca.org 
Sent: Monday, November 17, 2003 6:27 PM
Subject: Re: After run Oil

Hi Bill,
        You will get a wide range of opinions on this. The main difference will be whether or not to use any, and if not, whether or not to run the engine dry. 
         I never use after run, however, performance specialties sell an after run that will not harm the internals of the engine. DO NOT USE A PETROLEUM BASED PRODUCT OF ANY KIND.
         I run Cool Power heli fuel and run the engine dry after flying. I never have replaced bearings because of need. I have replaced the bearings just to "make me feel better" but they seemed fine. When I rebuild a YS, the inside is full of oil, even though I run it dry after flying. When running it dry, only the part of the fuel that burn will run out, leaving a good bit of oil still in the engine.
 
          Hope this helps get the thread started, good luck, Terry

----- Original Message ----- 
From: Bill  <mailto:billt38122 at comcast.net> Thompson 
To: discussion at nsrca.org 
Sent: Monday, November 17, 2003 4:06 PM
Subject: After run Oil

What is the best after run oil should I use in my YS engines ?
 
Bill Thompson
AMA 7703

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