X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2341105 for flyrotary@lancaironline.net; Thu, 20 Sep 2007 01:32:28 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070920053149.WSHX18654.fed1rmmtao102.cox.net@fed1rmimpo02.cox.net> for ; Thu, 20 Sep 2007 01:31:49 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo02.cox.net with bizsmtp id qVXo1X0014AaN600000000; Thu, 20 Sep 2007 01:31:48 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: TDC Date: Wed, 19 Sep 2007 22:32:08 -0800 Message-ID: <000001c7fb4f$f818c6f0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7FB0C.E9F586F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7FB0C.E9F586F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I used the option 3 below, but what is not mentioned there is that is = TDC for the tip seal. TDC for the combustion chamber is 60 degree from = there on the rotor; or 120 degree on the eccentric shaft. Easy enough to figure degrees by counting teeth on the starter ring gear. Al G (3) Or, (Similar to above) Take both plugs out of number one.=20 Turn engine in running direction until an apex seal appears in the = trailing plug hole. Gently turn the engine backwards until an apex seal appears in the = leading plug hole.=20 Half way between those two events is TDC. With practice, accurate enough = to do by just feel and rocking back and forth by hand and to find TDC = within a few degrees, or close enough to drop in the distributor and have the = engine fire instantly and run fine.=20 =20 ------=_NextPart_000_0001_01C7FB0C.E9F586F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I used the option 3 below, but what is = not mentioned there is that is TDC for the tip seal.  TDC for the = combustion chamber is 60 degree from there on the rotor; or 120 degree on the eccentric = shaft.  Easy enough to figure degrees by counting teeth on the starter ring = gear.

Al G

 (3)

Or,

(Similar to above)

Take both plugs out of number one. =

Turn engine in running direction until an = apex seal appears in the trailing plug hole.

Gently turn the engine backwards until an = apex seal appears in the leading plug hole.

Half way between those two events is TDC. = With practice, accurate enough to do by just feel and rocking back and forth = by hand and to find TDC within a few degrees, or close enough to drop in the distributor and have the engine fire instantly and run fine. =

 

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