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Date: Mon, 25 Nov 2013 11:52:02 -0800
Message-ID: <CAAXEWUroQJSpPjC0_bcdHXNrYn1=nV3TXnDa7MTx4g51zuv4Gg@mail.gmail.com>
Subject: Re: [LML] Vibration
From: "William A. Hogarty" <billhogarty@gmail.com>
To: Lancair Mailing List <lml@lancaironline.net>
Content-Type: multipart/alternative; boundary=089e013cc2b2a188ca04ec05b2ee

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Dan:

Did you happen to see the discussion on recent IV-P vibration?  I think a
cracked crankshaft  flange turned out to be the problem.

Good luck

Bill Hogarty


On Mon, Nov 25, 2013 at 5:08 AM, Dan Ballin <dballin@gmail.com> wrote:

> I am trying to figure out the source of a vibration in a fixed gear
> Legacy with an IO-550.  The plane had a recent condition inspection
> and raced at Reno- vibration present before Reno but maybe worse now.
> It is RPM related with the worst being about 24-2500 RPM better at 26
> to 2700 RPM.  Somewhat speed related - worse with higher speed, but
> mostly it is RPM that determines the severity.  The prop has been
> balanced dynamically and I actually hooked it up to another instrument
> just to see if the equipment was OK.
>
> We have looked for anything rubbing or loose including engine mounts
> and isolators, baffling.  All EGT and CHT's are fine and close
> together - haven't done an in flight mag check, but will soon.
> Compressions are fine on all cylinders.  All the wheel pants and
> struts look good and nothing was seen vibrating on close inspection in
> the air.
>
> So one question is can the vibration be engine related if the prop
> balance is good or does that pretty much rule it out.
>
> Any thoughts or suggestions would be appreciated.
>
> Dan Ballin
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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<div dir=3D"ltr"><div>Dan:</div><div>=A0</div><div>Did you happen to see th=
e discussion on recent IV-P vibration?=A0 I think a cracked crankshaft=A0 f=
lange turned out to be the problem.</div><div>=A0</div><div>Good luck</div>=
<div>=A0</div>
<div>Bill Hogarty</div></div><div class=3D"gmail_extra"><br><br><div class=
=3D"gmail_quote">On Mon, Nov 25, 2013 at 5:08 AM, Dan Ballin <span dir=3D"l=
tr">&lt;<a href=3D"mailto:dballin@gmail.com" target=3D"_blank">dballin@gmai=
l.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">I am trying to figure out the source of a vi=
bration in a fixed gear<br>
Legacy with an IO-550. =A0The plane had a recent condition inspection<br>
and raced at Reno- vibration present before Reno but maybe worse now.<br>
It is RPM related with the worst being about 24-2500 RPM better at 26<br>
to 2700 RPM. =A0Somewhat speed related - worse with higher speed, but<br>
mostly it is RPM that determines the severity. =A0The prop has been<br>
balanced dynamically and I actually hooked it up to another instrument<br>
just to see if the equipment was OK.<br>
<br>
We have looked for anything rubbing or loose including engine mounts<br>
and isolators, baffling. =A0All EGT and CHT&#39;s are fine and close<br>
together - haven&#39;t done an in flight mag check, but will soon.<br>
Compressions are fine on all cylinders. =A0All the wheel pants and<br>
struts look good and nothing was seen vibrating on close inspection in<br>
the air.<br>
<br>
So one question is can the vibration be engine related if the prop<br>
balance is good or does that pretty much rule it out.<br>
<br>
Any thoughts or suggestions would be appreciated.<br>
<br>
Dan Ballin<br>
<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></div>

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