[SPAM] Re: Rust [PMX:]

[Pascale, Mike]

Just for the a word of thought I've straighten out 4ea YS crank shafts and
have found the enter race turning on all 4 crank shafts  any one else seen
this this will also cause premature bearing failure 

-----Original Message-----
From: ray ayestaran [mailto:pizzaalt at concentric.net] 
Sent: Tuesday, October 12, 2004 4:00 PM
To: discussion at nsrca.org
Subject: [SPAM] Re: Rust [PMX:]


these bearings should last at least 300 flights, add 2 cups of reg gas to a
gal of your preferred model fuel - you will notice no diff in performance
but you will get necessary anti rust and cleansing additives that are in the
gas. 

----- Original Message ----- 
From: XCellHeli at aol.com <mailto:XCellHeli at aol.com>  
To: discussion at nsrca.org <mailto:discussion at nsrca.org>  
Sent: Tuesday, October 12, 2004 2:16 PM
Subject: Rust

RE: OS 1.40 rear bearing rust - by Bax OS Factory Engine Support
~~~~~~~~~~~~~~

On a Pattern engine, being flown in a Pattern airplane, 100 flights would be
about normal for bearing wear.  A competitive Pattern flyer will need to
change out the bearings 1-2 times per flying season (depending upon how much
practice time is spent).

Corrosion is caused by model fuel.  The alcohol in the fuel absorbs water.
Synthetic oils are slightly acidic and are not corrosion preventers, they
are lubricants.  The two are not necessarily the same.  Some spent
combustion products always work themselves into the lower-end of the engine
and they are slightly acidic.  This encourages corrosion by providing an
electrolyte between the dissimilar metals in the engine (aluminum and
steel).

You need to run the engine dry of fuel at the end of each flying session,
and then flood the engine with an after-run product.  One of the hobby
blends of after run oil, Marvel Mystery Oil, automatic transmission fluid,
non-graphite gun oil, a good coating-type machine tool oil...all will work
well.

If the fuel has more than 25%-50% of the oil blend being castor oil, you'll
also get significant corrosion protection.  Engines run on all-castor fuels
don't get much corrosion, but you do have to clean the engine to remove the
varnish buildup from the castor oil.  It also will become gummy when it sits
for a long time. 


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Chris Dansereau Sr.
 


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