After run Oil
Vicenterc at comcast.net
Vicenterc at comcast.net
Wed Nov 19 18:45:19 AKST 2003
All:
When I flew in Venezuela long ago we couldn't use nitro. We mixed the our own fuel. The bearings lasted a lot longer than now on ST 60 size engines. I suspect that nitro could be part of the problem but not sure. The question is: Can nitro residues produce harmful acids that promote rust when the engine cools down?
Regards,
Vicente Bortone
> Many years ago I stored a diaphragm in Mobil-1 after a tip from Harvey Thomasian
> (a retired oil engineer). After a year I used the diaphragm with no problems at
> all. I have YS parts that are ten years old that have come out of Mobil-1
> treated engines - still no rust on them.
>
> One thing that gets missed with after-run oils is what it does to the pressure
> feed tubing. I am talking about exhaust or crankcase pressure. This line often
> becomes rubbery and slips off, over time. Using the wrong after run,(any
> petroleum based product), has this effect. Since switching to Mobil-1 none of my
> sport engines have soft silicone tubing problems.
>
> One caveat. I have not yet found a way to keep the big 2-c, NON stainless-steel,
> bearings from having a rusted ball-cage. So all of the above is about .25-.50
> 2-c's and all 4-c YS's.
>
> Regards,
>
> Eric.
>
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of Troy Newman
> Sent: Wednesday, November 19, 2003 2:12 PM
> To: discussion at nsrca.org
> Subject: Re: After run Oil
>
>
> I can tell you from experience Mobile 1 synthetic does not effect the
> Silicone parts is a YS motor. These are the only parts that have problems
> with a regular oil...In the Standard Pressure system YS the Plunger and the
> Diaphragm are silicone. And Petroleum products will attack, deform, and
> "melt" the Silicone parts to a point where they no longer seal or function
> as they are not the proper shape. If left the Silicone parts will totally
> dissolve.
>
> Mobile 1 Synthetic motor oil does not attack the silicone. If you want proof
> stick some fuel tubing(silicone fuel tubing) in a jar with Havoline 10W-30
> and a piece in Mobile 1 Synthetic....Come back in 2 weeks and examine the
> two fuel lines. This will tell you the difference in the two products.
>
> By the way the newer YS motors like the DZ with the direct injection fuel
> system don't have the silicone parts....I don't know if the pump Diaphragm
> can be deformed by petroleum products or not but I suspect not.
>
> All other YS's that have the demand Pressure regulator have that silicone
> Plunger...It is very critical to engine operation...If deformed it will not
> allow the motor to idle properly and will be the cause in most cases of the
> drip drip drip out the carb while a motor is idling or when it shuts off.
>
> TN
> ----- Original Message -----
> From: "Jeff Hughes" <jhughes at hsonline.net>
> To: <discussion at nsrca.org>; <discussion at nsrca.org>
> Sent: Wednesday, November 19, 2003 1:58 PM
> Subject: RE: After run Oil
>
>
> > Dean,
> > I guess that is what is confusing me. Mobile 1 is synthetic oil mfg'd
> > to mimic oils made by distilling. The only difference between them is
> > the Mobile 1 molecules are all identical, giving better viscosity,
> > temperature range, etc., where natural oils have a range of lengths.
> > Rubbers that are incompatible in regular motor oil are also
> > incombatible with Mobile 1.
> >
> >
> > > Hi Jeff,
> > > It's a straight synthetic.
> > > Dean P.
> > >
> > > -----Original Message-----
> > > From: Jeff Hughes [mailto:jhughes at hsonline.net]
> > > Sent: Wednesday, November 19, 2003 7:30 AM
> > > To: discussion at nsrca.org; discussion at nsrca.org
> > > Subject: Re: After run Oil
> > >
> > >
> > >
> > > If you can't use petroleum based lubricants in a YS, why are people
> > > advocating using Mobile 1? It's synthetic petroleum base.
> > >
> > >
> > > > It is petroleum based.. Not for YS
> > > > John Ferrell
> > > > 6241 Phillippi Rd
> > > > Julian NC 27283
> > > > Phone: (336)685-9606
> > > > johnferrell at earthlink.net
> > > > Dixie Competition Products
> > > > NSRCA 479 AMA 4190 W8CCW
> > > > "My Competition is Not My Enemy"
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: mike mueller
> > > > To: discussion at nsrca.org
> > > > Sent: Tuesday, November 18, 2003 7:43 PM
> > > > Subject: RE: After run Oil
> > > >
> > > >
> > > > I've read that Marvels Mystery Compressor oil is the thing to
> > > use. Any thoughts? By the way I saw quite a few problems with the
> > > pushrods and the pump cams on the DZ's this last season. The pre
> > lube
> > > thing sounds smart. Mike
> > > >
> > > > Dean Pappas <d.pappas at kodeos.com> wrote:
> > > > 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
> > > > 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 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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