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Message-ID: <1c23473f050924122168525ad7@mail.gmail.com>
Date: Sat, 24 Sep 2005 12:21:05 -0700
From: David Leonard <wdleonard@gmail.com>
Reply-To: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: pressure in the crank-case
In-Reply-To: <list-731949@logan.com>
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On 9/24/05, Russell Duffy <13brv3@bellsouth.net> wrote:
>
> Hi Dave,
>  Sorry to hear of the odd problem.
>  So I fix the oil filler stem but on a ground run there is now oil coming
> out of the turbo.
>  When you say coming out of the turbo, where exactly is it coming out? Th=
e
> exhaust? The turbo housing?
>
 Both out the exhaust and around the turbine housing where it meets the
center section. Basically this means that oil is not draining and is going
out past the oil seal.

  If I take the oil filler cap off, oil stops coming out of the turbo. So
> something is pressurizing the crank-case. Engine is running fine otherwis=
e.
> The crank case vent is not plugged (but is too small to let out large
> amounts of gas). The oil does not appear to have water in it, so it seems=
 to
> be either compression or exhaust gas that is getting in.
>  What causes that? A blown side seal?
>  That's all I can think of. When you leave the oil cap off, and rev the
> engine, do you get a lot of oil fog out of the filler opening?
>
 Mostly large droplets.

 If so, I'd say the side seals, or corner seals are history.
>  Have you been running the snot out of the engine recently? High RPM and
> boost? Are you absolutely sure you haven't lost oil pressure, or severely
> overheated the oil recently?
>
 I am using up to 40" on take off but mostly cruise around at 32" or less.
This is more that I used to be able to RPM has never been over 6500. Never
lost oil pressure, oil never even gets very hot. My new cooling duct works
well enough that I am running it a little hotter than I used to be able to
do, but nothing too far out.

 You really do seem to be finding the failure modes for everyone else.
>
 Yea, I should send you all a bill :-)

  Rusty (Slingshot likely to be HKS powered, shopping for new project for
> the single rotor)
>

Yea, you are way down on non-flying aircraft, I recommend buying more :-)

--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html

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<br><br>
<div><span class=3D"gmail_quote">On 9/24/05, <b class=3D"gmail_sendername">=
Russell Duffy</b> &lt;<a href=3D"mailto:13brv3@bellsouth.net">13brv3@bellso=
uth.net</a>&gt; wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><span><font face=3D"Arial" color=3D"#ff0000">Hi Dave, </font></span></=
div>
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
>
<div><span><font face=3D"Arial" color=3D"#ff0000">Sorry to hear of the odd =
problem.&nbsp;</font></span></div><span class=3D"q">
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
>
<div>So I fix the oil filler stem but on a ground run there is now oil comi=
ng out of the turbo.<font face=3D"Arial"><font color=3D"#ff0000"><span>&nbs=
p;</span></font></font></div>
<div><font face=3D"Arial"><font color=3D"#ff0000"><span></span></font></fon=
t>&nbsp;</div></span>
<div><font face=3D"Arial"><font color=3D"#ff0000"><span>When you say coming=
 out of the turbo, where exactly is it&nbsp;coming out?&nbsp; The exhaust?&=
nbsp; The turbo housing?&nbsp;&nbsp;</span><span>&nbsp;</span></font></font=
></div></blockquote>
<div>&nbsp;</div>
<div>Both out the exhaust and around the turbine housing where it meets the=
 center section.&nbsp; Basically this means that oil is not draining and is=
 going out past the oil seal.</div><br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span class=3D"q">
<div>&nbsp;</div>
<div>If I take the oil filler cap off, oil stops coming out of the turbo.&n=
bsp; So something is pressurizing the crank-case.&nbsp; Engine is running f=
ine otherwise.&nbsp; The crank case vent is not plugged (but is too small t=
o let out large amounts of gas).&nbsp; The oil does not appear to have wate=
r in it, so it seems to be either compression or exhaust gas that is gettin=
g in.=20
</div>
<div>&nbsp;</div>
<div>What causes that?&nbsp;&nbsp;A blown side seal?&nbsp;&nbsp;<span><font=
 face=3D"Arial" color=3D"#ff0000">&nbsp;</font></span></div>
<div><span></span>&nbsp;</div></span>
<div><span><font face=3D"Arial" color=3D"#ff0000">That's all I can think of=
.&nbsp; When you leave the oil cap off, and rev the engine, do you get a lo=
t of oil fog out of the&nbsp;filler opening?</font>&nbsp;</span></div></blo=
ckquote>
<div>&nbsp;</div>
<div>Mostly large droplets.</div><br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><span><font face=3D"Arial" color=3D"#ff0000"> If so, I'd say the side =
seals, or&nbsp;corner seals are history.&nbsp; </font></span></div>
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
>
<div><span><font face=3D"Arial" color=3D"#ff0000">Have you been running the=
 snot out of the engine recently?&nbsp;High RPM and boost?&nbsp;&nbsp;&nbsp=
;Are you absolutely sure you haven't lost oil pressure, or severely overhea=
ted the oil recently?&nbsp;=20
</font></span></div>
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
></blockquote>
<div>&nbsp;</div>
<div>I am using up to 40&quot; on take off but mostly cruise around at 32&q=
uot; or less.&nbsp;&nbsp;This is more that I used to be able to&nbsp; RPM h=
as never been over 6500.&nbsp; Never lost oil pressure, oil never even gets=
 very hot.&nbsp; My new cooling duct works well enough that I am running it=
 a little hotter than I used to be able to do, but nothing too far out.
</div><br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><span><font face=3D"Arial" color=3D"#ff0000">You really do seem to be =
finding the failure modes for everyone else.&nbsp;</font></span></div>
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
></blockquote>
<div>&nbsp;</div>
<div>Yea, I should send you all a bill&nbsp; :-)</div><br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><span><font face=3D"Arial" color=3D"#ff0000"></font></span>&nbsp;</div=
>
<div><span><font face=3D"Arial" color=3D"#ff0000">Rusty (Slingshot likely t=
o be HKS powered, shopping for new project for the single rotor)</font></sp=
an></div></blockquote></div><br>Yea, you are way down on non-flying aircraf=
t, I recommend buying more&nbsp; :-)
<br clear=3D"all"><br>-- <br>Dave Leonard<br>Turbo Rotary RV-6 N4VY<br><a h=
ref=3D"http://members.aol.com/_ht_a/rotaryroster/index.html">http://members=
.aol.com/_ht_a/rotaryroster/index.html</a><br><a href=3D"http://members.aol=
.com/_ht_a/vp4skydoc/index.html">
http://members.aol.com/_ht_a/vp4skydoc/index.html</a>=20

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