Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 340095 for flyrotary@lancaironline.net; Fri, 30 Jul 2004 18:20:27 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.32; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao07.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with SMTP id <20040730221957.JRUL8002.fed1rmmtao07.cox.net@davidandanne> for ; Fri, 30 Jul 2004 18:19:57 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Turbo and the EC2 Date: Fri, 30 Jul 2004 15:19:57 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01C47648.AC3B3220" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_002B_01C47648.AC3B3220 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit MessageDon't forget also that part of the reason Tracy didn't incorporate a split is for redundancy. The Trailing plugs, when acting alone, were shown to not work very well when retarded. Dave Leonard I'm hearing from Leon that the ignition timing in general, and specifically the timing split between leading and trailing is CRITICAL to turbo installations. I "think" Tracy is retarding the ignition with boost, but I don't know how much. The aftermarket computer that I had on my FD allowed you to change anything you wanted wrt timing or fuel. I didn't mess with the timing much, but recall that the rule was to never have a negative split under boost. In other words, never have the trailing fire before the leading. I think the guys who need to worry about exactly what split to run, are also the guys who are making 500+ HP out of a 13B. I suspect that Tracy's 0 split will be perfectly fine for our needs, assuming the turbo can be kept under control. I also don't see any better option than the EC-2 for turbo use, in fact, I think it's just dandy. Cheers, Rusty (Where would rotary aviation be without Tracy?) ------=_NextPart_000_002B_01C47648.AC3B3220 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Don't=20 forget also that part of the reason Tracy didn't incorporate a split is = for=20 redundancy.  The Trailing plugs, when acting alone, were shown to = not work=20 very well when retarded.
 
Dave=20 Leonard


 
I'm hearing=20 from Leon that the ignition timing in general, and specifically the = timing=20 split between leading and trailing is CRITICAL to turbo installations. =  I=20 "think" Tracy is retarding the ignition with boost, but I don't know = how=20 much. 
 
The = aftermarket computer=20 that I had on my FD allowed you to change anything you wanted wrt = timing=20 or fuel.  I didn't mess with the timing much, but recall = that=20 the rule was to never have a negative split under boost.  In = other=20 words, never have the trailing fire before the leading.  I = think the=20 guys who need to worry about exactly what split to run, are also = the guys=20 who are making 500+ HP out of a=20 13B.  
 
I suspect = that Tracy's 0=20 split will be perfectly fine for our needs, assuming the turbo can be = kept=20 under control.  I also don't see any better option than the EC-2 = for=20 turbo use, in fact, I think it's just dandy. =20    
 
Cheers,
Rusty (Where = would rotary=20 aviation be without Tracy?)
 
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