From: "David Leonard wdleonard@gmail.com" <flyrotary@lancaironline.net>
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Date: Fri, 21 May 2021 20:45:45 -0700
Message-ID: <CAOFHbnqbjJsxK+cmHWhwgi=Y1Y1GTY+WuN9WJga39x9VxYk+BA@mail.gmail.com>
Subject: Re: [FlyRotary] Fwd: PSRU oil pressure
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Matt,

The RWS instructions are very clear about this, and they even note that the
RWS design is different than the Ross.  I believe that the full pressure
oil input is not for the plenary gears, but rather the main bearings.
While I was racing at Reno (exceeding the 300hp specifications of the RD-1B
I use), I seized the drive by overheating the main bearings and had to
replace the drive to complete the week of racing.  Turns out that my oil
feed line was probably inadequate and after I enlarged it I was able to
complete more heats at Reno.

So by all means, please keep the full pressure full flow oil plumbing to
Tracy's drives.

Dave Leonard

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">Hi Matt,<div><br></div><div>The RWS instructions are very =
clear about this, and they even note that the RWS design is different than =
the Ross.=C2=A0 I believe that the full pressure oil input is not for the p=
lenary gears, but rather the main bearings.=C2=A0 While I was racing at Ren=
o (exceeding the 300hp specifications of the RD-1B I use), I seized=C2=A0th=
e drive by overheating the main bearings and had to replace the drive to co=
mplete the week of racing.=C2=A0 Turns out that my oil feed line was probab=
ly inadequate and after I enlarged it I was able to complete more heats at =
Reno.</div><div><br></div><div>So by all means, please keep the full pressu=
re full flow oil plumbing=C2=A0to Tracy&#39;s drives.</div><div><br></div><=
div>Dave Leonard</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 href=3D"=
mailto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 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 pla=
yed 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 crankca=
se. Without it, I did a pull and turned off the engine and 5psi stayed with=
in the system until I cracked open the dipstick to relieve the pressure.<br=
></div><div dir=3D"ltr"><br>On Neil&#39;s PSRU, the oil inlet is on the fro=
nt half. The front drain is on the side, which connects to the back drain t=
hat is an10, then to the oil pan.<br><br>Anyways, the stock psru inlet rest=
rictor 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 lot=
s of oil was venting back into the oil dipstick tube. I kept on sizing down=
 the restrictor=C2=A0until 1/16th. That mostly kept the vent clean and clea=
r of any pressure build up inside the psru.<div><br>I&#39;m not sure why Tr=
acy recommends=C2=A0having the psru fuel of oil, maybe uses different beari=
ngs then Neil&#39;s? From a truck gear case perspective, plantey gears only=
 need a coating of oil, not full and pressurized. I&#39;m probably wrong, b=
ut 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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