X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from eu1sys200aog118.obsmtp.com ([207.126.144.145] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with SMTPS id 3766140 for flyrotary@lancaironline.net; Mon, 20 Jul 2009 14:51:02 -0400 Received-SPF: none receiver=logan.com; client-ip=207.126.144.145; envelope-from=jefferson.owen@st.com Received: from source ([167.4.1.35]) (using TLSv1) by eu1sys200aob118.postini.com ([207.126.147.11]) with SMTP ID DSNKSmS8bnvSnjH7LUKwQl198VmYZqbYS7lf@postini.com; Mon, 20 Jul 2009 18:51:01 UTC Received: from zeta.dmz-us.st.com (ns4.st.com [167.4.80.115]) by beta.dmz-us.st.com (STMicroelectronics) with ESMTP id 916E44A for ; Mon, 20 Jul 2009 18:47:42 +0000 (GMT) Received: from mail1.snj.st.com (mail1.snj.st.com [167.4.202.26]) by zeta.dmz-us.st.com (STMicroelectronics) with ESMTP id 83A49287 for ; Mon, 20 Jul 2009 18:50:19 +0000 (GMT) Received: from SNJ10012526 ([167.4.204.149]) by mail1.snj.st.com (MOS 3.8.7a) with ESMTP id CMG08948 (AUTH "jefferson owen"); Mon, 20 Jul 2009 11:50:19 -0700 (PDT) From: Jefferson E OWEN To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Alternator Filter Date: Mon, 20 Jul 2009 11:50:19 -0700 Message-ID: <009001ca096a$edbfbdf0$95cc04a7@snj.st.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0091_01CA0930.4160E5F0" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 thread-index: AcoJaAGB8X48LJJNQsKxW6hBrTk6GgAAcnpQ In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0091_01CA0930.4160E5F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Joe/Al, Remember the injector opening time is also related to the voltage, especially at lower RPM. You will probably have to completely redo the mixture settings for the higher voltage. As a test try adjusting the mixture. Jeff _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Monday, July 20, 2009 12:30 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Alternator Filter Tuning is coming along pretty well on my newly running 20B. I have run into a bit of a snag. Until last week I was running only on battery power, then I brought my alternator on line. When the alternator is turned on, the engine starts to stumble and run rough. As soon as the alternator is turned off it starts to run smoothly again. Any suggestions for alternator filtering? Thanks, Joe Joe; You can try 100 mf capacitor between the alternator output and ground. Do you notice any other parameters changing besides the voltage? And how much does the voltage change. I have not found it necessary to filter the alternator output. If anything, my engine runs smoother with alternator on. My conclusion is that I do my tuning with it on; voltage about 14.5v. Running with it off and maybe just under 12v changes the tuning a bit. Al ------=_NextPart_000_0091_01CA0930.4160E5F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Joe/Al,
 
Remember the injector opening time is also related to the = voltage,=20 especially at lower RPM.  You will probably have to completely redo = the=20 mixture settings for the higher voltage.  As a test = try adjusting the=20 mixture.
 
Jeff

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Al=20 Gietzen
Sent: Monday, July 20, 2009 12:30 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Alternator=20 Filter

Tuning is coming along pretty well on my newly = running=20 20B.  I have run into a bit of a snag.  Until last week I was = running=20 only on battery power, then I brought my alternator on line.  When = the=20 alternator is turned on, the engine starts to stumble and run = rough.  As=20 soon as the alternator is turned off it starts to run smoothly = again.  Any=20 suggestions for alternator filtering?

 

Thanks,

Joe

 

Joe;

 

You can = try 100 mf=20 capacitor between the alternator output and ground.  =

Do you = notice any=20 other parameters changing besides the voltage? And how much does the = voltage=20 change.

 

I have not = found it=20 necessary to filter the alternator output.  If anything, my engine = runs=20 smoother with alternator on.  My conclusion is that I do my tuning = with it=20 on; voltage about 14.5v. Running with it off and maybe just under 12v = changes=20 the tuning a bit.

 

Al

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