X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop: No license found, only first 5 messages were scanned Return-Path: Received: from vms042pub.verizon.net ([206.46.252.42] verified) by logan.com (CommuniGate Pro SMTP 5.1c.1) with ESMTP id 1206537 for flyrotary@lancaironline.net; Mon, 26 Jun 2006 10:39:54 -0400 Received: from verizon.net ([71.99.163.147]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0J1H00657227DX57@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Mon, 26 Jun 2006 09:39:44 -0500 (CDT) Date: Mon, 26 Jun 2006 10:39:39 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: Timing adjustment In-reply-to: To: Rotary motors in aircraft Message-id: <449FF1AB.3080806@verizon.net> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) What may be confusing some here is the 35 BTDC static setting. That doesn't mean that the ignition actually fires at 35 BTDC. I believe that Tracy chose that setting to give the ECU plenty of time to receive the signal from the pickup and then calculate the actual firing time, which will vary by RPM, but be close to the yellow and red taining marks on the pulley. Finn Ed Anderson wrote: > Sorry, if I made it confusing, David. > > Basically, I set static timing to 35 deg BTDC. I then fly with my > ignition timing retarded 3.75 deg by the EC2 or at 31.25 deg BTDC. > I normally use the center position as MY neutral timing position. If > you punch the program control button 10 times that puts you at the > most retarded timing position. Then anything lessening retard (i.e > increasing advance) I make from that position. So I set the control > knob to the 3 O'clock position and from the "Most Retarded" position > (of the 10 positions) I punch it 5 times to get me to the "center". I > do not run the engine at less than the center position (position 5). > Then I have found that for my installation that if I increase it by > three more clicks of the program button that gives me what I want when > flying. I personally have not notice or found any benefit (in my > installation) with any less that the center position. YMMV > > Hope that was somewhat clearer. > > Ed > ----- Original Message ----- From: "David Carter" > > To: "Rotary motors in aircraft" > Sent: Saturday, June 24, 2006 4:05 PM > Subject: [FlyRotary] Re: Timing adjustment > > >> Ed, >> When you said, "I fly with my timing set 3 forward of the center >> position >> which means 2 retarded or 2* 1.875=3.75." >> >> did you mean " I fly with my timing set 3.75 retarded, i.e., 'two >> button pushes', i.e., 3.75 degrees from 35 degree max >> static BTDC."? >> >> In other words, I'm asking for clarification on the ". . . set 3 >> forward of the center position . . . " phrase. Was the "3" supposed >> to be "3.75"? Or is there some other physical measurement with >> respect to ". . . the center position . . . " of something not >> explicitely mentioned? >> >> David Carter >> >> ----- Original Message ----- From: "Ed Anderson" >> >> To: "Rotary motors in aircraft" >> Sent: Friday, June 23, 2006 1:19 PM >> Subject: [FlyRotary] Re: Timing adjustment >> >> >>> Buly, >>> >>> Last I recall, Tracy's instructions were to set the static timing at >>> approx 35degree BTDC for maximum advance. Then you can retard the >>> timing >>> from that point using the EC2 mode 8? (Ignition Timing Adjustment mode) >>> for best performance. Each time you push the program store button >>> in mode >>> 8 it changes the timing approx 1.875 deg. There are 10 adjustments >>> possible for a total of 9.375 degs. Or when set at 35 deg static you >>> would retard the timing to a minimum of 35-9.375 deg = 25.625 deg BTDC. >>> >>> I fly with my timing set 3 forward of the center position which means 2 >>> retarded or 2* 1.875 = 3.75. Which would give me 35 - 3.75 or 31.25 >>> degs >>> BTDC for normal flight. >>> >>> Ed >>> ----- Original Message ----- From: "Bulent Aliev" >>> >>> To: "Rotary motors in aircraft" >>> Sent: Friday, June 23, 2006 2:54 PM >>> Subject: [FlyRotary] Timing adjustment >> >> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >> > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >