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Subject: Re: [LML] Engine surging
From: Mike Larkin <legacyl2k@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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Is the surging showing up on the Manifold Pressure Gauge?  The noise could
be the pump surging and not the engine.  What is you data bit rate?  If it
is to far apart (say once every 5 seconds) you may not see it in the data.
We can start here,,

Mike Larkin


On Mon, Sep 30, 2013 at 5:58 AM, Art Jensen <flycassutts@yahoo.com> wrote:

> Looking for thoughts from the collective minds of the LML.  Last flight in
> my IO-550 normally aspirated legacy, I noticed surging in the engine with
> the low boost pump on. I did not notice any surging when I turned the boost
> pump off. Also did not notice any fluctuation in RPM. Nor did I see any
> fluctuation in RPM when I downloaded the engine data. The obvious question
> would be what are the possible causes and does it make the airplane unsafe
> for flight as there is no surge when the boost pump is off. I don't
> understand how I could feel and hear surging in the engine yet see no
> fluctuation in RPM, so I'm stumped. Any ideas would be appreciated, thank
> you.
> Art
>
> Sent from my iPhone; Art Jensen
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>



-- 
Mike Larkin
LarkinAviationConsulting
LegacyL2K@gmail.com
602-770-6054

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<div dir=3D"ltr"><div>Is the surging showing up on the Manifold Pressure Ga=
uge?=A0 The noise could be the pump surging and not the engine.=A0 What is =
you data bit rate?=A0 If it is to far apart (say once every 5 seconds) you =
may not see it in the data.=A0 We can start here,,<br>
<br></div>Mike Larkin<br></div><div class=3D"gmail_extra"><br><br><div clas=
s=3D"gmail_quote">On Mon, Sep 30, 2013 at 5:58 AM, Art Jensen <span dir=3D"=
ltr">&lt;<a href=3D"mailto:flycassutts@yahoo.com" target=3D"_blank">flycass=
utts@yahoo.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Looking for thoughts from the collective min=
ds of the LML. =A0Last flight in my IO-550 normally aspirated legacy, I not=
iced surging in the engine with the low boost pump on. I did not notice any=
 surging when I turned the boost pump off. Also did not notice any fluctuat=
ion in RPM. Nor did I see any fluctuation in RPM when I downloaded the engi=
ne data. The obvious question would be what are the possible causes and doe=
s it make the airplane unsafe for flight as there is no surge when the boos=
t pump is off. I don&#39;t understand how I could feel and hear surging in =
the engine yet see no fluctuation in RPM, so I&#39;m stumped. Any ideas wou=
ld be appreciated, thank you.<br>

Art<br>
<br>
Sent from my iPhone; Art Jensen<br>
--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists/lml/L=
ist.html</a><br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><font style=3D"font-fam=
ily:georgia,serif;color:rgb(0,0,0)" size=3D"4">Mike Larkin</font><br style=
=3D"color:rgb(51,51,255)"><font style=3D"color:rgb(51,51,255)" size=3D"4">L=
</font><span style=3D"color:rgb(51,51,255)">arkin</span><font style=3D"colo=
r:rgb(51,51,255)" size=3D"4">A</font><span style=3D"color:rgb(51,51,255)">v=
iation</span><font style=3D"color:rgb(51,51,255)" size=3D"4">C</font><span =
style=3D"color:rgb(51,51,255)">onsulting</span><br style=3D"color:rgb(51,51=
,255)">
<span style=3D"color:rgb(51,51,255)"><a href=3D"mailto:LegacyL2K@gmail.com"=
 target=3D"_blank">LegacyL2K@gmail.com</a></span><br style=3D"color:rgb(51,=
51,255)"><span style=3D"color:rgb(51,51,255)">602-770-6054</span>
</div>

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