X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([204.127.217.103] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4233226 for flyrotary@lancaironline.net; Sat, 24 Apr 2010 22:58:24 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.103; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-113-131.mco.bellsouth.net[98.85.113.131]) by isp.att.net (frfwmhc03) with SMTP id <20100425025747H0300183cue>; Sun, 25 Apr 2010 02:57:47 +0000 X-Originating-IP: [98.85.113.131] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: getting lost in the tuning process Date: Sat, 24 Apr 2010 22:57:50 -0400 Message-ID: <74B30B327773482BBC7048276AC6CFCD@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01CAE401.90E35C00" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcrkH1jkz2QfhsWsRaaO2viq95gOIgAAK5Mw X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_000D_01CAE401.90E35C00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I was working on tuning today and I seem to be getting lost. I have the Renesis and I recently changed my injectors out from the Red/Blue to all 4 yellow. These are larger than the Red primary, but smaller than the blue secondary. The total flow is close to the same for both. First thing I did was check fuel injector flow rate, Mode 3. Between 22 and 26" of manifold pressure that they maintained good mixture with the mixture knob in the center. So far, so good. Next is Secondary Injector Differential adjustment, Mode 6. First I cleared the large secondary mode. Then I tried to get the mixture mid range at <14". This required a lot of leaning on the mixture knob. Same for above 16". So I turned the program knob to the right and hit store several times. Soon I could move the manifold pressure back and forth over the staging point and the engine ran smoothly. But then I found that I could only run the engine at high power with the mixture knob all the way lean!??? Did I do something wrong? How did this happen? I think I am lost. I don't really understand what I am trying to accomplish with the mode 6, and when I ever get to mode 2, I am going to really be up the understanding creek. Anyone who would like to enlighten me would be appreciated. My current plan is to clear it out and start over from the beginning again tomorrow. Tracy's instructions kind of make me think that he is expecting the mixture to go rich. My problem is that it is rich to begin with and doesn't seem to really change that much. Thanks for the assistance! Bill B ------=_NextPart_000_000D_01CAE401.90E35C00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I was working on tuning today and I = seem to be getting lost. 

I have the Renesis and I recently = changed my injectors out from the Red/Blue to all 4 yellow.  These are = larger than the Red primary, but smaller than the blue secondary.  The total = flow is close to the same for both.

First thing I did was check fuel = injector flow rate, Mode 3.  Between 22 and 26” of manifold pressure = that they maintained good mixture with the mixture knob in the center.  = So far, so good.

Next is Secondary Injector = Differential adjustment, Mode 6.  First I cleared the large secondary = mode.  Then I tried to get the mixture mid range at <14”.  This required = a lot of leaning on the mixture knob.  Same for above 16”.  So = I turned the program knob to the right and hit store several times.  Soon I = could move the manifold pressure back and forth over the staging point and the = engine ran smoothly.

 

But then I found that I could only = run the engine at high power with the mixture knob all the way lean!???  = Did I do something wrong?  How did this happen?

 

I think I am lost.  I = don’t really understand what I am trying to accomplish with the mode 6, and when I = ever get to mode 2, I am going to really be up the understanding creek. =

 

Anyone who would like to enlighten = me would be appreciated.

 

My current plan is to clear it out = and start over from the beginning again = tomorrow.

 

Tracy’s instructions kind of make me think that he is = expecting the mixture to go rich.  My problem is that it is rich to begin = with and doesn’t seem to really change that much.

 

Thanks for the = assistance!

 

Bill B

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