ggower_99(at)yahoo.com
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 Posted: Wed Mar 08, 2006 12:30 am Post subject: Subaru oil and avgas. |
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I dont know if the (your) Subaru reduction uses the same engine oil as the R 912.
This is important, in the Rotax the oil has to do several main "jobs". One. libricate the engine, Two use the same oil to lubricate the reduction gears, Three, hold the lead in the avgas and take it to the filter. This is why they advise semisinthetic...
Another good oil (the one we use here) is the oil used in the big Honda 4 cycle engined bikes: semisinthetic, heavy duty and works with engine and transmission.
If your Subaru has a separate oil (SAE 90) for the reduction (or uses a cog belt for example), a good semi or full mineral automotive oil will work perfect with Avgas.
Mineral (normal) oil "holds" the lead particles, just change it every 25 or 50 hours, depending on the hours flown over a year... low hours, sooner the change.
Something I have heard, but not read in a serious surce yet, is that sinthetic oil is not a good heat tranfer oil... but not sure.
Saludos
Gary Gower.
Mike Sinclair <mike.sinclair(at)ATT.NET> wrote:
Michel
I don't remember whether it was someone from LEAF or from Lockwood that
told me, but I'm using Valvoline Durablend 10w-40 in my 912. It's a semi
synthetic and from my limited understanding, it suspends the lead
particles that would accumulate on the internal surfaces of the engine. I
was told that it will work with mogas and avgas, bit if using avgas
during any period the oil changes are then supposed to be on a more
frequent basis. I would suspect that the Subaru is affected much the same
as the Rotax. It has got my curiosity up and now I'm going to have to
look back into the pro's and con's of the different types of oil. I do
know that my original engine documentation listed several brands of oil,
but when I tried to locate them (such as this one Shell designation that
seemed to be the one for an occasional avgas usage), I was told that
these types listed in the Rotax documentation were European blends only
and not available in the US. That was when I started the phone calls to
the experts. I believe I still have the answer somewhere, but am unable
to locate it right now, so will now need to begin the questioning again.
I did a search of the archives and didn't find a suitable answer there.
It is also possible that a current answer may be in the Rotax service
bulletins but haven't had a chance to peruse them again yet (but it is on
my to do right away list). If anyone out there can point us in the right
direction for this information, or have a definitive answer on oil types,
it would be much appreciated.
Mike Sinclair N701TD Back out of Phase I, and most certainly impressed
with the performance of the 912uls as compared to the 80hp engine. It's
like a whole new airplane! At gross it outperforms what it used to do
with just me and minimum fuel. Though being a 701 it still don't go fast,
just gets up there quicker.
Michel Therrien wrote:
| Quote: |
I'm presently using Castrol Syntech 5-50 oil on my
Subaru powered CH601-HD. Now, I'd like to make longer
flights and use avgas, but I learned that synthetic
oil is no good with leaded gas.
I'm wondering if anyone here flying a Subaru uses
aviation oil on their automotive conversions. I'm
thinking about the Shell 15w-40 semi-synthetic oil.
Are there any other good alternatives for oil
compatible with avgas?
Michel
----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby
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