After run Oil
Troy Newman
troy_newman at msn.com
Wed Nov 19 10:11:31 AKST 2003
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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