X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([207.115.11.56] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4247443 for flyrotary@lancaironline.net; Tue, 04 May 2010 14:31:06 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.56; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-113-131.mco.bellsouth.net[98.85.113.131]) by isp.att.net (frfwmhc06) with SMTP id <20100504183031H0600ppqr6e>; Tue, 4 May 2010 18:30:31 +0000 X-Originating-IP: [98.85.113.131] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: tuning issues Date: Tue, 4 May 2010 14:30:39 -0400 Message-ID: <06F2FB4F53324167943B151C9A04AA97@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CAEB96.5EA12000" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcrrsCDEr76MZOEbS82O6Nlow34mrAAB2xSg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CAEB96.5EA12000 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit None of the changes made on A during the tuning process has been transferred to B. I don't think B would be meaningful since it is so different. Do you agree? Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Tuesday, May 04, 2010 1:34 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: tuning issues When something is truly random, there are no clues. You have to check everything. What have you checked? Try the easiest things first. Flip that little switch. Does it do the same thing on both controllers? On Tue, May 4, 2010 at 1:19 PM, Bill Bradburry wrote: I don't think it is fuel filter related. The fuel pressure is holding steady during this time. I think it is some kind of misfire, but have no clue as to what could be causing it or how to go about diagnosing it. It is both random and intermittent and happens at various rpms. Nothing seems consistant about it happening. What should I check? Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Tuesday, May 04, 2010 12:53 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: tuning issues Anything that causes a misfire will cause the mixture to indicate lean. Remember, it's an Oxygen sensor. If you don't burn the fuel it's got a lot of that being pumped down the exhaust making the instrument think things are Very lean.. Problem may not be fuel related at all. Tracy On Tue, May 4, 2010 at 11:46 AM, Bill Bradburry wrote: After I get the engine running smoothly in a range, it will occasionally hiccup. When it does, the mixture will then go down sometimes off the scale, then come back to where it was. I have not noticed any dips in the MAP table at these locations. Any ideas, suggestions? Bill B -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0000_01CAEB96.5EA12000 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

None of the changes made on A = during the tuning process has been transferred to B.  I don’t think B = would be meaningful since it is so different.  Do you agree?

 

Bill B

 

From: = Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy = Crook
Sent: Tuesday, May 04, = 2010 1:34 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = tuning issues

 

When something = is truly random, there are no clues.  You have to check everything.  = What have you checked?  Try the easiest things first.  Flip that little = switch.   Does it do the same thing on both controllers?

 

On Tue, May 4, 2010 at 1:19 PM, Bill Bradburry <bbradburry@bellsouth.net>= wrote:

I don’t think it is fuel filter related.  The = fuel pressure is holding steady during this time.  I think it is some kind of = misfire, but have no clue as to what could be causing it or how to go about = diagnosing it.  It is both random and intermittent and happens at various = rpms.  Nothing seems consistant about it = happening.

What should I check?

 

Bill B

 

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy = Crook
Sent: Tuesday, May 04, = 2010 12:53 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = tuning issues

 

Anything that causes a misfire will cause the mixture to indicate lean.  = Remember, it's an Oxygen sensor.  If you don't burn the fuel it's got a lot of = that being pumped down the exhaust  making the instrument think things are = Very lean.. 

Problem may not be fuel related at all.

Tracy

On = Tue, May 4, 2010 at 11:46 AM, Bill Bradburry <bbradburry@bellsouth.net> = wrote:

After = I get the engine running smoothly in a range, it will occasionally
hiccup.  When it does, the mixture will then go down sometimes off = the
scale, then come back to where it was.  I have not noticed any dips = in the
MAP table at these locations.
Any ideas, suggestions?

Bill B

 

 

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