From: "David Leonard wdleonard@gmail.com" <flyrotary@lancaironline.net>
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Date: Sat, 12 Sep 2020 18:39:22 -0700
Message-ID: <CAOFHbnpTR-tTqPDD-vFzeb247bBChiZNRLU5q+v54OfOawwVeg@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Turbo oil cut-off valve
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Todd,

You know when it's time to flip the switch when the turbo is no longer
working and you find yourself being restricted to manifold pressures that
are consistent with normal aspiration, yet the engine is otherwise running
normally.  If you find yourself wanting to flip the switch, you probably
already know that the turbo is toast.  Also, as in one of the instances
that happened to me, someone on the ground might radio and say that you are
'on fire' because of the large amount of smoke in your exhaust.  If at any
point you are in doubt, you can turn sharply and examine your exhaust.  If
you seem to be using your uninstalled smoke system, flip the switch.

Good question though.

Dave Leonard

On Sat, Sep 12, 2020 at 12:36 PM Marc Wiese cardmarc@charter.net <
flyrotary@lancaironline.net> wrote:

> Most certified aircraft have a check valve (that requires regular
> maintenance) in the return line.
>
> Marc
>
>
>
> *From:* Rotary motors in aircraft
> *Sent:* Saturday, September 12, 2020 4:13 AM
> *To:* Rotary motors in aircraft <flyrotary@lancaironline.net>
> *Subject:* [FlyRotary] Turbo oil cut-off valve
>
>
>
> Hi Dave;
>
>   Today I installed a small normally open solenoid valve on my turbo oil
> supply line. An AME that happened by was questioning how exactly that I
> would know that my turbo bearings were failed and loosing oil. I couldn't
> give him an answer that he was satisfied with and he now has me questioning
> whether I would know with a reasonable degree of certainty.
>
>   So exactly what did your turbo do when it failed that made you certain
> of what it was.
>
>   I figure that if I got it wrong and cut off oil when it was still
> working, then worst case is that I just destroy $1AMU turbo, but most
> likely it would just destroy the bearings.
>
>
>
> Todd
>

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<div dir=3D"ltr">Hi Todd,<div><br></div><div>You know when it&#39;s=C2=A0ti=
me to flip the switch when the turbo is no=C2=A0longer working and you find=
 yourself being restricted to manifold pressures that are consistent with n=
ormal aspiration, yet the engine is otherwise running normally.=C2=A0 If yo=
u find yourself=C2=A0wanting to flip the switch, you probably already know =
that the turbo is toast.=C2=A0 Also, as in one of the instances that happen=
ed to me, someone on the ground might radio and say that you are &#39;on fi=
re&#39; because of the large amount of smoke in your exhaust.=C2=A0 If at a=
ny point you are in doubt, you can turn sharply and examine your exhaust.=
=C2=A0 If you seem to be using your uninstalled smoke system, flip the swit=
ch.=C2=A0=C2=A0</div><div><br></div><div>Good question though.</div><div><b=
r></div><div>Dave Leonard</div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Sat, Sep 12, 2020 at 12:36 PM Marc Wiese =
<a href=3D"mailto:cardmarc@charter.net">cardmarc@charter.net</a> &lt;<a hre=
f=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt=
; wrote:<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 la=
ng=3D"EN-US"><div class=3D"gmail-m_-1059654557134554096WordSection1"><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">Most c=
ertified aircraft have a check valve (that requires regular maintenance) in=
 the return line.<u></u><u></u></span></p><p class=3D"MsoNormal"><span styl=
e=3D"font-size:12pt;color:rgb(31,73,125)">Marc<u></u><u></u></span></p><p c=
lass=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)"><u><=
/u>=C2=A0<u></u></span></p><div style=3D"border-right:none;border-bottom:no=
ne;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0=
in"><p class=3D"MsoNormal"><b>From:</b> Rotary motors in aircraft <br><b>Se=
nt:</b> Saturday, September 12, 2020 4:13 AM<br><b>To:</b> Rotary motors in=
 aircraft &lt;<a href=3D"mailto:flyrotary@lancaironline.net" target=3D"_bla=
nk">flyrotary@lancaironline.net</a>&gt;<br><b>Subject:</b> [FlyRotary] Turb=
o oil cut-off valve<u></u><u></u></p></div><p class=3D"MsoNormal"><u></u>=
=C2=A0<u></u></p><div><p class=3D"MsoNormal">Hi Dave;<u></u><u></u></p><div=
><p class=3D"MsoNormal">=C2=A0 Today I installed a small normally open sole=
noid valve on my turbo oil supply line. An AME that happened by was questio=
ning how exactly that I would know that my turbo bearings were failed and l=
oosing oil. I couldn&#39;t give him an answer that he was satisfied with an=
d he now has me questioning whether I would know with a reasonable degree o=
f certainty.<u></u><u></u></p></div><div><p class=3D"MsoNormal">=C2=A0 So e=
xactly what did your turbo do when it failed that made you certain of what =
it was.<u></u><u></u></p></div><div><p class=3D"MsoNormal">=C2=A0 I figure =
that if I got it wrong and cut off oil when it was still working, then wors=
t case is that I just destroy $1AMU turbo, but most likely it would just de=
stroy the bearings.<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u><=
/u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">Todd<u></u><u></u></p=
></div></div></div></div></blockquote></div>

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