X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 02 May 2010 15:14:07 -0400 Message-ID: X-Original-Return-Path: Received: from [216.200.145.38] (HELO omta0105.mta.everyone.net) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4244631 for lml@lancaironline.net; Sun, 02 May 2010 07:55:08 -0400 Received-SPF: none receiver=logan.com; client-ip=216.200.145.38; envelope-from=bknotts@buckeye-express.com Received: from dm0224.mta.everyone.net (sj1-slb03-gw2 [172.16.1.96]) by omta0105.mta.everyone.net (Postfix) with ESMTP id 6576D730D06 for ; Sun, 2 May 2010 04:54:31 -0700 (PDT) X-Eon-Dm: dm0224 Received: by dm0224.mta.everyone.net (EON-AUTHRELAY2 - 1835a814) id dm0224.4bd13821.44aa12 for ; Sun, 2 May 2010 04:54:30 -0700 X-Eon-Sig: AQK8DXBL3Wf2gspjHwIAAAAB,755e26e7125f1da29b5e3b922fb86d08 X-Original-Message-ID: <4BDD67F7.5000304@buckeye-express.com> X-Original-Date: Sun, 02 May 2010 07:54:31 -0400 From: "F. Barry Knotts" Reply-To: bknotts884@earthlink.net User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] TSIO 550E IV-P vibration References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------060909080308030208070807" This is a multi-part message in MIME format. --------------060909080308030208070807 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit With altitude ambient air pressure is reduced thereby reducing the dielectric resistance "under the hood." I had an MG once upon a time that gave a very pretty light show if I parked at night and opened the bonnet with the engine running while in the Rockies. (Can you say Lucas?) Look for electrical "leaks" in the ignition wires and most specifically look at the pressurized mags to be sure that they are pressurizing properly. One of your mags may be consistently misfiring at altitude. It may require a rebuild to find out. Barry Knotts N4XE, LIV-P, Conti TSIO-550 Bob Rickard wrote: > > TSIO 550 guys and or smart engine guys: > > > > I am having a vibration issue and want to see if anyone has ideas on > what to look for. Basically, at takeoff and climbout to around > 10,000', the motor and prop are very smooth and strong. There is no > vibration (prop very recently balanced) and all numbers are normal. > As I pass above 10k to the low flight levels, a vibration in the motor > starts to develop, and when I level off and set the engine for cruise > (LOP, 18gph, 34 MAP, 2500 RPM) the vibration is at its worst. It's > almost like the prop is out of balance, which is why I had the prop > balanced at 2500 rpm. Speeds are good and all engine numbers are > normal, no changes. This will remain for an hour or 2, then the motor > seems to magically smooth itself out. On descent and landing, motor > seems smooth and all numbers are normal. Very recently, on a 4.5 hour > flight, about 3.5 to 4 hours in the vibration slowly came back. I > don't know what to blame, and my motor mechanic is looking at me > funny. I should note that at no time do I think the vibration is > horrible or unsafe, just annoying. I can feel it in the stick and see > it in the panel when its happening. > > > > Things I have ruled out: > > Balance of the prop > > Dirty plugs or fuel injectors (new plugs and cleaned > injectors) > > Speed effect (increase or decrease speed has no effect) > > Fuel issues > > Flight control flutter or anything like that > > > > Things that have been suggested: > > A bad valve in a cylinder that doesn't show until you > get to altitude, > > Or bad compression in a cylinder that comes and goes > (all cyl's were comp tested a month ago though) > > Turbo controller not scheduling properly as you climb > > Fuel injection system malf? > > > > I'm hoping one of you has had this problem and can point me and the > mechanic to the possible culprit. Appreciate any comments > > > > Bob Rickard > > IV-P > > > > > --------------060909080308030208070807 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit With altitude ambient air pressure is reduced thereby reducing the dielectric resistance "under the hood."  I had an MG once upon a time that gave a very pretty light show if I parked at night and opened the bonnet with the engine running while in the Rockies.  (Can you say Lucas?)

Look for electrical "leaks" in the ignition wires and most specifically look at the pressurized mags to be sure that they are pressurizing properly.  One of your mags may be consistently misfiring at altitude.  It may require a rebuild to find out.

Barry Knotts
N4XE, LIV-P, Conti TSIO-550


Bob Rickard wrote:

TSIO 550 guys and or smart engine guys:

 

I am having a vibration issue and want to see if anyone has ideas on what to look for.  Basically, at takeoff and climbout to around 10,000’, the motor and prop are very smooth and strong.  There is no vibration (prop very recently balanced) and all numbers are normal.  As I pass above 10k to the low flight levels, a vibration in the motor starts to develop, and when I level off and set the engine for cruise (LOP, 18gph, 34 MAP, 2500 RPM) the vibration is at its worst.  It’s almost like the prop is out of balance, which is why I had the prop balanced at 2500 rpm.  Speeds are good and all engine numbers are normal, no changes.  This will remain for an hour or 2, then the motor seems to magically smooth itself out. On descent and landing, motor seems smooth and all numbers are normal. Very recently, on a 4.5 hour flight, about 3.5 to 4 hours in the vibration slowly came back.  I don’t know what to blame, and my motor mechanic is looking at me funny.  I should note that at no time do I think the vibration is horrible or unsafe, just annoying.  I can feel it in the stick and see it in the panel when its happening.

 

Things I have ruled out:

                Balance of the prop

                Dirty plugs or fuel injectors (new plugs and cleaned injectors)

                Speed effect (increase or decrease speed has no effect)

                Fuel issues

                Flight control flutter or anything like that

 

Things that have been suggested:

                A bad valve in a cylinder that doesn’t show until you get to altitude,

                Or bad compression in a cylinder that comes and goes (all cyl’s were comp tested a month ago though)

                Turbo controller not scheduling properly as you climb

                Fuel injection system malf?

               

I’m hoping one of you has had this problem and can point me and the mechanic to the possible culprit.  Appreciate any comments

 

Bob Rickard

IV-P

 

 


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