Fuel/Water, Bearing/Rust

[Jerry Voth]

When I was using .60 engines with tuned pipes, I had to replace bearings really often. The only time I didn't have bearing problems is when I used straight castor, however, due to the black exhaust residue, I ruined so many shirts (mine and my caller's) that I didn't save any money, and it was getting really difficult to find someone to call for me. Since I've gone back to the larger (1.40) two strokes I've been using straight castor fuel as an after run-keep it in a separate tank and run it about a minute and it seems to slow down the rust. My 4 stroke engines have run for years wit;h no bearing changes-no after run oil-not run dry. They have non tuned pipes-used only for quietness, on them which makes me wonder if the exhaust residues that are forced back into the engine by the tuned pipe are causing the corrosion or acting as a catalyst when mixing with unburned fuel remaining in the engine.

Jerry Voth
NSRCA  1073
- Original Message ----- 
  From: Karl G. Mueller 
  To: discussion at nsrca.org 
  Sent: Saturday, December 06, 2003 9:55 AM
  Subject: Re: Fuel/Water, Bearing/Rust


    Anybody ever check to see if bearings with brass cages
    will rust sooner than those with steel ones? I don't use
    them because the brass cages with disintegrate before the
    steel ones do.

    Karl G. Mueller
    kgamueller at rogers.com

      ----- Original Message ----- 
      From: Bob Pastorello 
      To: discussion at nsrca.org 
      Sent: Saturday, December 06, 2003 10:11 AM
      Subject: Re: Fuel/Water, Bearing/Rust


      Good point, Bill.
          Does anyone KNOW if the "brass corrosion"/conversion into acetic acid is the REAL deal?  How can we find out?
          Wouldn't it be bizarre if the corrosion on bearings issue was due to something like this?

      Bob Pastorello, Oklahoma
      NSRCA 199, AMA 46373
      rcaerobob at cox.net
      www.rcaerobats.net


        ----- Original Message ----- 
        From: Bill Glaze 
        To: discussion at nsrca.org 
        Sent: Saturday, December 06, 2003 9:48 AM
        Subject: Re: Fuel/Water, Bearing/Rust


        Bob:
        You might want to take a look at the plated clunks occasionally, I've had the plating break down, (possibly from vonstant vibratory contact with the bottom of the fuel tank) and then the brass begins to corrode.  Bill Glaze

        Bob Pastorello wrote:

Also, most clunks I've seen lately aren't brass-looking.  They apparently
are plated and look shiny-brite metal.  I've drilled some of them, to find
they're brass underneath.  So that sort of begs the question, WHY would fuel
tank manufacturers add the expense of plating a KLUNK ??
    My Mintor setup has no brass that I can see; it will be interesting to
see how this goes.  Has an MK tank, aluminum tubes, nylon tees in lines.
Plated clunk in the tank.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: "Brian Young" <b4598070 at yahoo.com>
To: <discussion at nsrca.org>
Sent: Friday, December 05, 2003 7:45 AM
Subject: RE: Fuel/Water, Bearing/Rust


  Cant remember if the fuel needed the water in it to
break down into acetic acid..anyone recall?   ;0

I have had older brass clunks corrode the nipple off
at the end of the tubing.....I have noticed the little
green brass particles plugging up the ports on some of
my engines....always wondered why they used the brass
for this stuff. I use plastic or aluminum if I can,
and steel clunk if available.


--- Dwayne & Nancy <dwaynenancy at cox.net> wrote:
    Bob, Joe said that blaming water in the fuel as the
cause of bearing
rust was a "folk tale".  The cause was the fuel
decomposing into acetic
acid (vinegar).  The decomposition is caused by the
catalytic effect of
the brass components inside the fuel tank.  Joe
tried leaving bearings
in several brands of fuel for four months without
any rust forming.  You
should read the magazine more carefully.  You can't
tell when something
valuable with show up.  <VBG>  Dwayne

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]
On Behalf Of Bob Pastorello
Sent: Thursday, December 04, 2003 8:25 PM
To: discussion at nsrca.org
Subject: Re: Fuel/Water, Bearing/Rust

Okay - Matt - since my MA already found it's way to
the shredder....
    WHAT did he say about rust protection?

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: Rcmaster199 at aol.com
To: discussion at nsrca.org
Sent: Thursday, December 04, 2003 6:11 PM
Subject: Fuel/Water, Bearing/Rust

The diatribe of the last week or so on this list has
been, shall we say,
rather........ interesting, (except for the news
about Kirk Gray, that's
plain sad). It's time for something new.

In this month's Model Aviation, Joe Wagner talks
about experiments he
has run with a trusty old engine. He ran baseline
performance data with
his regular fuel and then he added water in his fuel
to see how badly
performance would be affected. His results where
very interesting. Shall
we say that he made chopped meat out of that "sacred
cow".

He also briefly touches on what really is the root
cause of bearing
rust. Even the uninitiated should find that
interesting. Could a
solution to all of your OS bearing woes be this
simple?

There, that ought to whet your whistle.

Matt K

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