Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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 Posted: Sat Apr 11, 2009 6:51 pm Post subject: Synthetic and Mineral oil compatibility/corrosion resistance |
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On Sat, April 11, 2009 5:27 pm, rawheels wrote:
| Quote: | Are the BPM XP-S/XPS Synthetic and Mineral oils compatible with each other?
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Switching kinds does not give rise to compatibility problems it's mixing them that is
the problem. There may be some incompatible additives in various motor oils so mixing
those oil types in a batch could be the problem but when there is only a trace amount
of one left over during a change of type, there is no problem.
| Quote: | Meaning,
could you run the synthetic during the main flying season to capitalize on it's
properties, and then start using the mineral oil just before the "slow" season to help
with corrosion?
|
Whether or not there is a difference in corrosion resistance between full synthetic
and straight mineral oil it is of little concern compared to protecting bearing
surfaces and cylinder walls from condensation. Keeping the engine warm and dry is a
far more significant anti-corrosion factor than worrying about the slight difference
in residual oil coating remaining between synthetic and mineral oil.
I believe best practice is to store an unused engine out of the weather and if it is
not going to be used for an extended period of time, then misting the internals with
oil is best practice. If the air in and around the engine is only a few degrees warmer
than the ambient outside air temperature, it will almost certainly be above the dew
point and therefore, no condensation will occur. Usually the coldest time of the day
is night time and even an unheated hangar will be warmer at night than outside so that
really reduces the chance of condensation. The heat from a 60W light bulb inside a
closed engine cowling will keep the air inside considerably warmer than ambient and
therefore above dew point.
I think the most important factor for selecting a two stroke oil for a relatively
expensive engine such as a Rotax or a boat motor is first getting one that produces
the least fouling on the piston crown and rings and in the exhaust system then wear
protection would be the next biggest consideration. For me, using 100LL (Avgas) in
these engines would be out of the question. In fact, even thinking of it, gives me a
headache.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
Airplanes are interesting toys but of no military value.
-- Marechal Ferdinand Foch, Professor of Strategy,
Ecole Superieure de Guerre
There is perhaps in every thing of any consequence, secret history, which
it would be amusing to know, could we have it authentically communicated.
-- James Boswell
I'm proud to be paying taxes in the United States. The only thing is
-- I could be just as proud for half the money.
-- Arthur Godfrey
We should have a great many fewer disputes in the world if only words were
taken for what they are, the signs of our ideas only, and not for things
themselves.
-- John Locke
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
|
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