[NSRCA-discussion] After run oil ?

[Rcmaster199 at aol.com]

I am not sure why this kind of argument surfaces every couple years.....but 
it does. In my experience, whatever procedure works for you after a session 
then use that. As Tom mentioned, in humid climes you might want to use the after 
run. In drier climes you can get away with what Mike and Wayne do. I lived in 
hot, humid FLA for 16 years and learned to use castor as the after run and 
never had bearing problems. When I moved to Jersey a couple years ago (which is 
also a humid place in the summer) I didn't follow the method as religiously as 
in FLA and had a bearing failure in my W160 after less than 100 runs. Lesson 
learned.
 
The take away is that the newer folks among us should pay attention to what 
the more experienced are doing in THEIR area and follow that technique. 
 
Running the engine rich throughout the range is a major reason bearings last 
a long time and conversely,  lean runs are bearings killers regardless of the 
afterrun method one uses. Rich running throughout requires a properly tuned 
set-up for 2 strokes on pipes. In my view, 4 strokes generally have had 
comparatively few bearing problems because they won't run well lean but run fine at 
richer settings.
 
And BTW, as Karl implies below, higher nitro requires a more open needle 
which, among other things, forces more oil through the engine per cycle
 
MattK
 
In a message dated 5/9/2007 5:50:38 PM Eastern Standard Time, 
kgamueller at rogers.com writes:

I'm going to have to chime in here.
After running OS 160s for about 5 years ( 2 engines alternating )
and changing to Powermaster 20/20 and 20/30 I have had no
problems with rust whatsoever. During the season of high humidity
I will run the engines dry after a flying session. Last fall I did that
before hanging the planes up for the winter with the nose down
and that is all. No after run oil of any kind. When I inspected the
2 engines this spring there was not a sign of rust to be found.
Still running the original bearings as well. Now I did find some wear
on the rear bearing on one engine and will put a new set of just
standard bearings in it. 
The exhaust residue is always still on the pink side (color of the oil)
and my engines have never run hot.
With running the higher nitro you would think that this would cause
more of a problem. But not so. I am very happy with the results
and will keep on using the fuel I am using now.
 
Karl G. Mueller
_kgamueller at rogers.com_ (mailto:kgamueller at rogers.com) 






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