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pbesing(at)yahoo.com
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 Posted: Wed May 10, 2006 8:07 pm Post subject: Oil Sample Results |
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Has anyone ever got negative results on an oil sample?
I never have...there's a remark that says everything
is normal on everyone I've ever got.
I know the reason some of us do it, don't need that
lesson, but do you REALLY need to spend the $17/oil change?
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rv7a(at)cox.net
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| Posted: Wed May 10, 2006 8:30 pm Post subject: Oil Sample Results |
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Paul that is up to you on spending the $17 per sample. But you might rest
better knowing "everything is normal" Years ago I worked for Mobil Oil and
we had a program for heavy earth moving contractors called EMPA, Engine
Maintenance through Progressive Analysis. These contractors would really
appreciate the "everything is normal" report. On the other hand sometimes
things weren't normal and they usually knew where to look for the problem.
In another situation we took a 1500 hour TBO engine in a C-182 in a flying
club to 2500 hours with progressive analysis. Was that comfort worth $680.
For a $20,000+ overhaul we thought it was. The engine was still performing
well when we finally pulled it off. We just ordered two analysis kits for
our Bellanca.
do not archive
Jim Thorne
7A-QB
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dan(at)rvproject.com
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| Posted: Wed May 10, 2006 9:06 pm Post subject: Oil Sample Results |
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| Quote: | Has anyone ever got negative results on an oil sample?
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Not "negative" per se, but a warning did come up once:
http://rvimg.com/images/2006/20060211_oil_analysis.jpg
Nickel was high one time. Hasn't come up since.
| Quote: | lesson, but do you REALLY need to spend the $17/oil change?
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Not imho, but I do spend $9 every 100 tach hours or so. Found a deal on AOA
kits for $88 for 10x kits when buying them directly from Staveley Services.
)_( Dan
RV-7 N714D (898 hours)
http://www.rvproject.com
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pbesing(at)yahoo.com
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| Posted: Wed May 10, 2006 9:56 pm Post subject: Oil Sample Results |
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I know they are a good idea, I should have re phrased
my question. Every oil change, is it a good idea is
more where I was going. I would think every 2 or 3 oil
changes would suffice in trends that could be
alarming.
Paul Besing
--- Jim Thorne <rv7a(at)cox.net> wrote:
| Quote: |
<rv7a(at)cox.net>
Paul that is up to you on spending the $17 per
sample. But you might rest
better knowing "everything is normal" Years ago I
worked for Mobil Oil and
we had a program for heavy earth moving contractors
called EMPA, Engine
Maintenance through Progressive Analysis. These
contractors would really
appreciate the "everything is normal" report. On
the other hand sometimes
things weren't normal and they usually knew where to
look for the problem.
In another situation we took a 1500 hour TBO engine
in a C-182 in a flying
club to 2500 hours with progressive analysis. Was
that comfort worth $680.
For a $20,000+ overhaul we thought it was. The
engine was still performing
well when we finally pulled it off. We just ordered
two analysis kits for
our Bellanca.
do not archive
Jim Thorne
7A-QB
browse
Subscriptions page,
FAQ,
Admin.
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alexpeterson(at)earthlink
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| Posted: Thu May 11, 2006 4:40 am Post subject: Oil Sample Results |
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| Quote: | Not "negative" per se, but a warning did come up once:
http://rvimg.com/images/2006/20060211_oil_analysis.jpg
Nickel was high one time. Hasn't come up since.
> lesson, but do you REALLY need to spend the $17/oil change?
Not imho, but I do spend $9 every 100 tach hours or so.
Found a deal on AOA kits for $88 for 10x kits when buying
them directly from Staveley Services.
)_( Dan
RV-7 N714D (898 hours)
http://www.rvproject.com
|
Dan, those numbers are amazingly low. It shows about 30 hours on the oil
each time you samples, is that correct? Anyway, my oil change time is 50
hobbs hours, and I usually have analysis numbers about twice yours. When I
spoke with an engine expert, he said that my numbers were about half of what
he usually sees.
So, you should make it to about 8000 hours before needing an overhaul, or
about two more years:^)
I once had an anomalous set of readings, and did more or less determine that
it was likely diesel engine oil that was actually analyzed instead of mine.
I like the price of yours better, as I've been paying about $13 for Shell
Analysis, which is now just Analysts, Inc. I don't know if it is important,
but they do look for more materials: zinc, tin, titanium, boron, sodium,
potassium, molybdenum, phosphorus, calcium, barium, antimony and vanadium.
Also, I get water content, viscosity, fuel content and TAN, total acid
content.
I do analyses at every oil change, which is 50 hobbs hours. You want them
to be boring, but if the engine is munching itself, I want to know sooner
rather than later. The analysis costs about 1% as much as fuel per hour.
Alex Peterson
RV6-A N66AP 752 hours
Maple Grove, MN
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dan(at)rvproject.com
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| Posted: Thu May 11, 2006 6:11 am Post subject: Oil Sample Results |
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| Quote: | Dan, those numbers are amazingly low. It shows about 30 hours on the oil
each time you samples, is that correct? Anyway, my oil change time is 50
hobbs hours, and I usually have analysis numbers about twice yours. When
I
spoke with an engine expert, he said that my numbers were about half of
what
he usually sees.
|
It's all about running LOP, baby!! The engine runs cleeeeaaan (and cool and
efficient and ... and ...).
do not archive
)_( Dan
RV-7 N714D
http://www.rvproject.com
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rhdudley1(at)bellsouth.ne
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| Posted: Thu May 11, 2006 9:11 am Post subject: Oil Sample Results |
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Paul,
I had an incidend that made me a believer.
We had a 235 Cherokee. I did oil analysis at every oil change just
because I thought it was a good idea.
My co-owner was away with the airplane when I received a phone call from
the lab for the latest analysis. They called to tell me that one element
( I don't remember which) was abnormally high and it suggested a broken
ring. I tracked down my co-owner to tell him the results. He had a
mechanic do a bore scope check of all cylinders and found scoring on one
cylider wall. With much thought and consultation, he decided that it
would be safe to fly the plane home. When the cylinder was removed,
there was a broken ring and a scored cylinder. It required replacing
piston and cylinder. The engine had only about 700 hours on it since new.
Without the oil analysis, I'm not sure that we would have discovered
that we had a broken ring. Also not sure what the long term implications
would be running with a broke ring.
That experience reinforced my general belief that oil analysis is a good
idea. I now do it at every oil change even if the time on the oil is
less than 50 hours.
Every owner can decide for himself whether and how often.
Richard Dudley
-6A flying
Paul Besing wrote:
| Quote: |
Has anyone ever got negative results on an oil sample?
I never have...there's a remark that says everything
is normal on everyone I've ever got.
I know the reason some of us do it, don't need that
lesson, but do you REALLY need to spend the $17/oil change?
__________________________________________________
|
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http://www.matronics.com/Navigator?RV-List |
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alexpeterson(at)earthlink
Guest
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| Posted: Thu May 11, 2006 9:25 am Post subject: Oil Sample Results |
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| Quote: |
> Dan, those numbers are amazingly low. It shows about 30 hours on the oil
> each time you samples, is that correct? Anyway, my oil change time is 50
> hobbs hours, and I usually have analysis numbers about twice yours. When
> I
> spoke with an engine expert, he said that my numbers were about half of
> what
> he usually sees.
It's all about running LOP, baby!! The engine runs cleeeeaaan (and cool and
efficient and ... and ...).
do not archive
)_( Dan
RV-7 N714D
http://www.rvproject.com
|
Dan, I run mine well lean of peak also, and have for 750 hours. I suspect some of the difference is number of hours between changes.
Alex Peterson
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dan(at)rvproject.com
Guest
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| Posted: Thu May 11, 2006 11:13 am Post subject: Oil Sample Results |
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| Quote: | Dan, I run mine well lean of peak also, and have for 750 hours. I suspect
some of the difference is number of hours between changes.
|
Gotcha. Yeah, I do oil changes somewhere between 25-30 tach hours. I
change the filter every other oil change. Those oil analyses of mine were
mixed...some were taken during the first "half" of the filter's life, some
were taken at the filter change.
You run electronic ignition as well, right? I believe EI contributes to a
cleaner burn and helps leave less for the oil to take on.
)_( Dan
RV-7 N714D (900 hours)
http://www.rvproject.com
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