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smokey_bear_40220(at)yaho
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 Posted: Tue May 30, 2006 10:58 am Post subject: Subaru EA81 oil |
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OK Rick,
Lance (remember him?) said to try aviation oil and not
synthetic, so I bought it, but didn't try it yet.
Guess I'll sell the case of 100 wt then and get some
semi-synthetic first, and full synthetic later to
compare.
Do I remember correctly, synthetics don't have the
water problem that regular oil does? Sometimes I
still run too cool. Haven't installed the thermostat
yet.
The synthetic should be better for the turbo, if it
doesn't exceed 360F there on shutdown. Wondering
about that since my turbo is normally 450F measured
after shutdown.
If I hit 360F otherwise, I've got more problems.....
Don't remember exceeding 250F so far. 235F max in
climb was more normal before I improved the airflow.
I had a ground run a while back that I shut down from
when the oil pressure was all over the place. I
thought indicator problem or that relief valve. Now I
am leaning to the valve. Couldn't find a wiring
problem and it ran fine in flight, but at lower
pressure than before at the same temps.
Does that relief valve just bypass the filter, or
return to the pan reducing oil flow where it is
needed?
I have always had to deal with low pressure at idle
after warmup, even when running 60+ psi on startup. I
need 210F or less to maintain 30+ psi idle. If
cruising around, I can reduce power for descent and it
will be plenty cool for idle power by landing, but
touch and goes are difficult to keep the temps down.
Ill try an oil change first and see what happens.
Kurt S. S-5 NIS turbo
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janderson412(at)hotmail.c
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| Posted: Tue May 30, 2006 12:54 pm Post subject: Subaru EA81 oil |
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kurt schrader <smokey_bear_40220(at)yahoo.com>
I have always had to deal with low pressure at idle
after warmup, even when running 60+ psi on startup. I
need 210F or less to maintain 30+ psi idle. If
cruising around, I can reduce power for descent and it
will be plenty cool for idle power by landing, but
touch and goes are difficult to keep the temps down.
------------------------------------------------
Kurt, I get 85 on startup and stays around 60 on warm up. Sounds like a
relief valve or or similar loss John
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smokey_bear_40220(at)yaho
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| Posted: Tue May 30, 2006 3:08 pm Post subject: Subaru EA81 oil |
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I was told my relief vavle was for 63 psi, but I have
seen it high when cold like you have. I agree with
you and Rick that this may be relieving itself
irregularily and at lower pressure. If I can correct
it without having to change the pump, it will
certainly cost less.
Still considering an electric oil pump in parallel for
start and shutdown. Probably can put it in for 2-3
lbs. It would be a backup, a pre-oiler, and something
to cool the oil running thru the turbo on shutdown. I
have the web site at home that someone on the list
provided. Sorry, I forgot who. 
I don't know which turbo oil fitting I have - small or
large.
Kurt S.
--- John Anderson <janderson412(at)hotmail.com> wrote:
| Quote: | Kurt, I get 85 on startup and stays around 60 on
warm up. Sounds like a relief valve or or similar
loss John
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wingsdown(at)comcast.net
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| Posted: Tue May 30, 2006 3:17 pm Post subject: Subaru EA81 oil |
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Not sure about the numbers on the synthetic, could be 400 plus, just
know its there but still better in my opinion that dinosaurs drippings.
Synthetics have the same problem with water but are better able to cope.
Oil temp above 190 for a good hour make it a non-issue. If oil does not
get hot enough long enough excess moisture is allowed to accumulate. If
you see any milky crap on your dip stick she is trying to tell you
something. Quality air oil separators are a good investment, but never
allow the crap it saves to go back to the pan, again just my opinion.
Optimum situation would be an oil recirculation pump for turbo cool
down, not practical because of the pressure type seals in our turbos,
but I did install a water circulation pump to help shed heat after shut
down, Again unless you come in hot, take the cable and have you hangar
next to the runway still should not be a serious issue.
The relief/bypass valve trys to keep a constant oil pressure at varying
engine RPMs by letting oil go back to the pan. If it were not there and
the pressure regulator spring and ball failed/stuck a bearing would or
could be floated. Or should the filter become cogged it keeps the oil
system from exploding. I believe I remember the Subaru oil pump having
this accomplished with one a single spring and valve. I have an extra
pump somewhere, now makes me want to open it back up. In any event, too
much pressure can float the bearing which makes it spin and as you can
imagine, bad thing. Also to little and you get metal to metal also bad
thing. To get extra volume you need to either increase the pressure or
the volume or both of the pump. If I remember correctly about 10 psi
for ever 1,000 rpms is a rule of thumb. So 50-60 PSI on the Subaru
sounds right. Having the oil cooler efficient is a whole different ball
game as you know. If you can find a way to pull the air through the
proper size cooler I think those pressures can be easily maintained.
You are right about the touch and goes, without an electric fan or
superior oil cooler set up the turbo just generates to many BTUs for
that activity.
Let us know how it progresses.
--
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