X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2340235 for flyrotary@lancaironline.net; Wed, 19 Sep 2007 14:57:26 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.36; envelope-from=BMears9413@aol.com Received: from BMears9413@aol.com by imo-d04.mx.aol.com (mail_out_v38_r9.2.) id q.d27.13589f3c (52373) for ; Wed, 19 Sep 2007 14:56:34 -0400 (EDT) Received: from WEBMAIL-MC12 (webmail-mc12.webmail.aol.com [64.12.170.89]) by ciaaol-m02.mx.aol.com (v119.9) with ESMTP id MAILCIAAOLM027-cc9546f170e215c; Wed, 19 Sep 2007 14:56:34 -0400 References: To: flyrotary@lancaironline.net Subject: TDC Date: Wed, 19 Sep 2007 14:56:34 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bmears9413@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8C9C905EEC6D6B5_BF8_5241_WEBMAIL-MC12.sysops.aol.com" X-Mailer: AOL WebMail 30583 Received: from 65.182.71.8 by WEBMAIL-MC12.sysops.aol.com (64.12.170.89) with HTTP (WebMailUI); Wed, 19 Sep 2007 14:56:34 -0400 Message-Id: <8C9C905EEC6D6B5-BF8-292B@WEBMAIL-MC12.sysops.aol.com> X-AOL-IP: 64.12.170.89 X-Spam-Flag: NO ----------MB_8C9C905EEC6D6B5_BF8_5241_WEBMAIL-MC12.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Changing the subject a bit, I want to make sure i have my motor on TDC to se= t my timing marks on the flywheel. This is my plan, tell me what you think.=20= I'm building a fitting to screw in the spark plug hole, and running a vacuum= line to a small suringe (like a insulin suringe). I can eyeball the rotor l= ocation close to TDC, the install this contraption and rotate the motor so t= he suringe moves out to the end and starts back in. then back the motor up a= gain till the suringe tops out. I figure that outa be and accurate TDC. Whad= da ya think??? Bob Mears Supermarine Spitfire -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Wed, 19 Sep 2007 1:16 pm Subject: [FlyRotary] Re: Strange Ignition?=20 I do not believe that is a significant factor, either, Al.=C2=A0 After all,=20= we're suppose to do our ignition checks on the ground before take off {:>).= =C2=A0 My understanding is that best power on the 13B has ignition timing be= tween 25-28 deg BTDC, so not surprising that the 20B would fall in that rang= e also.=C2=A0 Sounds reasonable to me. =C2=A0 Ed =C2=A0 =C2=A0 ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Wednesday, September 19, 2007 3:08 PM Subject: [FlyRotary] Re: Strange Ignition?=20 I wondered if perhaps one issue was that I was doing the ignition check stat= ic, on the ground; where the combination of RPM and MAP would be different t= han in the air.=C2=A0 But on checking with Tracy=E2=80=99s spreadsheet on th= e timing settings, over a fairly broad range above about 4900 the timing is=20= (should be) in the range of 26 to 28 degrees BTDC. =C2=A0 Al ________________________________________________________________________ Email and AIM finally together. You've gotta check out free AOL Mail! - http= ://mail.aol.com ----------MB_8C9C905EEC6D6B5_BF8_5241_WEBMAIL-MC12.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" Changing the subject a bit, I want to make sure i have my motor on TDC=20= to set my timing marks on the flywheel. This is my plan, tell me what you th= ink. I'm building a fitting to screw in the spark plug hole, and running a v= acuum line to a small suringe (like a insulin suringe). I can eyeball the ro= tor location close to TDC, the install this contraption and rotate the motor= so the suringe moves out to the end and starts back in. then back the motor= up again till the suringe tops out. I figure that outa be and accurate TDC.= Whadda ya think???

Bob Mears
Supermarine Spitfire


-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 19 Sep 2007 1:16 pm
Subject: [FlyRotary] Re: Strange Ignition?

I do not believe that is a significant factor, eithe= r, Al.  After all, we're suppose to do our ignition checks on the groun= d before take off {:>).  My understanding is that best power on the=20= 13B has ignition timing between 25-28 deg BTDC, so not surprising that the 2= 0B would fall in that range also.  Sounds reasonable to me.
 
Ed
 
 
----- Original Message -----
F= rom: Al= Gietzen
Sent: Wednesday, September 19, 2007 3= :08 PM
Subject: [FlyRotary] Re: Strange Igni= tion?

I wondered if perhaps one issue was that I was doing the ignition=20= check static, on the ground; where the combination of RPM and MAP would be d= ifferent than in the air.  But on checking with Tracy = ;
Al
Email and AIM finally together. You've gotta check out free AOL Mail!
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