From: "David Leonard wdleonard@gmail.com" <flyrotary@lancaironline.net>
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Date: Fri, 21 May 2021 21:09:36 -0700
Message-ID: <CAOFHbnocZKoEUfnmiCJsAGC4K=73-vCYBTgQuE4ajxY1Kq_edQ@mail.gmail.com>
Subject: Re: [FlyRotary] Fwd: PSRU oil pressure
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Ok, Here is my third comment.  Yes you should absolutely vent your
crankcase.  In addition to the stock vent located on the oil filler neck, I
also eventually installed an additional 1/2 in. vent.  Both of these lines
go through an oil/air separator which is vented in the low pressure
slipstream and drained out the gear leg.  And still it is not perfect, but
improved since the early hours.

As an aside,  I can tell you that increased blow-by is usually the first
indication that I am due for an engine rebuild (among several other more
imminent indications like a sudden loss of power).  I recommend keeping
track of blow-by (how much oil is caught by the oil air separator).  If you
start getting a lot of oil in the can, you will need a rebuild soon.

Dave Leonard
Turbo Rotary RV-6


On Fri, May 21, 2021 at 6:19 AM Matt Boiteau mattboiteau@gmail.com <
flyrotary@lancaironline.net> wrote:

> I played around the past few days with oil and psru. I added a psi gauge
> on top of psru,and vented the housing back to the oil dipstick tube. I have
> an oil breather tube from the fill port. We should have a vent on the oil
> crankcase. Without it, I did a pull and turned off the engine and 5psi
> stayed within the system until I cracked open the dipstick to relieve the
> pressure.
>
> On Neil's PSRU, the oil inlet is on the front half. The front drain is on
> the side, which connects to the back drain that is an10, then to the oil
> pan.
>
> Anyways, the stock psru inlet restrictor was 9/64. Once warmed up and
> running at 2200rpm static on the ground, engine oil is about 100psi for me.
> PSRU pressure was about 2.5psi and lots of oil was venting back into the
> oil dipstick tube. I kept on sizing down the restrictor until 1/16th. That
> mostly kept the vent clean and clear of any pressure build up inside the
> psru.
>
> I'm not sure why Tracy recommends having the psru fuel of oil, maybe uses
> different bearings then Neil's? From a truck gear case perspective, plantey
> gears only need a coating of oil, not full and pressurized. I'm probably
> wrong, but throwing it out there. ?.?
>
> - Matt Boiteau
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir=3D"ltr">Ok, Here is my third comment.=C2=A0 Yes you should absolut=
ely vent your crankcase.=C2=A0 In addition to the stock vent located on the=
 oil filler neck, I also eventually installed an additional 1/2 in. vent.=
=C2=A0 Both of these lines go through an oil/air separator=C2=A0which is ve=
nted in the low pressure slipstream and drained out the gear leg.=C2=A0 And=
 still it is not perfect, but improved since the early hours.<div><br></div=
><div>As an aside,=C2=A0 I can tell you that increased blow-by is usually t=
he first indication that I am due for an engine rebuild (among several othe=
r more imminent=C2=A0indications like a sudden loss of power).=C2=A0 I reco=
mmend keeping track of blow-by (how much oil is caught by the oil air separ=
ator).=C2=A0 If you start getting a lot of oil in the can, you will need a =
rebuild soon.</div><div><br></div><div>Dave Leonard</div><div>Turbo Rotary =
RV-6<br><div><br></div></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Fri, May 21, 2021 at 6:19 AM Matt Boiteau =
<a href=3D"mailto:mattboiteau@gmail.com">mattboiteau@gmail.com</a> &lt;<a h=
ref=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div =
dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr=
">I played around the past few days with oil and psru. I added a psi gauge =
on top of psru,and vented the housing back to the oil dipstick tube. I have=
 an oil breather tube from the fill port. We should have a vent on the oil =
crankcase. Without it, I did a pull and turned off the engine and 5psi stay=
ed within the system until I cracked open the dipstick to relieve the press=
ure.<br></div><div dir=3D"ltr"><br>On Neil&#39;s PSRU, the oil inlet is on =
the front half. The front drain is on the side, which connects to the back =
drain that is an10, then to the oil pan.<br><br>Anyways, the stock psru inl=
et restrictor was 9/64. Once warmed up and running at 2200rpm static on the=
 ground, engine oil is about 100psi for me. PSRU pressure was about 2.5psi =
and lots of oil was venting back into the oil dipstick tube. I kept on sizi=
ng down the restrictor=C2=A0until 1/16th. That mostly kept the vent clean a=
nd clear of any pressure build up inside the psru.<div><br>I&#39;m not sure=
 why Tracy recommends=C2=A0having the psru fuel of oil, maybe uses differen=
t bearings then Neil&#39;s? From a truck gear case perspective, plantey gea=
rs only need a coating of oil, not full and pressurized. I&#39;m probably w=
rong, but throwing it out there. ?.?</div><div><br>- Matt Boiteau<br></div>=
</div>
</div></div>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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