X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-scoter.atl.sa.earthlink.net ([209.86.89.67] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6614292 for lml@lancaironline.net; Mon, 25 Nov 2013 23:14:35 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.67; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=BzPtoS7+qvTnBIfCUt9Z+vOm5D1YchSL0gOm1GIELno0JRRzq3TeeeraBYDPy8gZ; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.105.253.253] (helo=[192.168.1.24]) by elasmtp-scoter.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VlA20-0003Sp-7Y for lml@lancaironline.net; Mon, 25 Nov 2013 23:13:48 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-234--889865318 Subject: Re: [LML] Re: Vibration Date: Mon, 25 Nov 2013 23:13:47 -0500 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <98CE2367-8267-4E21-8A62-12536D2B1BDB@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940319f822d120882bfc0ed3b91af86b450350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.105.253.253 --Apple-Mail-234--889865318 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Actually, to my knowledge, there's no data associating a vibration you = can feel with the particular cracked crankshaft issue that came up. There is a lot of other interesting data though. If you think you have = a problem you should talk to Kyrillian Dyer and Bob Pastusek. On Nov 25, 2013, at 2:52 PM, William A. Hogarty wrote: Dan: =20 Did you happen to see the discussion on recent IV-P vibration? I think = a cracked crankshaft flange turned out to be the problem. =20 Good luck =20 Bill Hogarty On Mon, Nov 25, 2013 at 5:08 AM, Dan Ballin 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 --Apple-Mail-234--889865318 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii Actually, to my knowledge, there's no data associating a vibration you can feel with the particular cracked crankshaft issue that came up.

There is a lot of other interesting data though.  If you think you have a problem you should talk to Kyrillian Dyer and Bob Pastusek.

On Nov 25, 2013, at 2:52 PM, William A. Hogarty wrote:

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

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