Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 340155 for flyrotary@lancaironline.net; Fri, 30 Jul 2004 20:18:10 -0400 Received-SPF: error receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6V0HbVw015572 for ; Fri, 30 Jul 2004 20:17:38 -0400 (EDT) Message-ID: <000c01c47693$caecc080$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Turbo and the EC2 Date: Fri, 30 Jul 2004 20:17:40 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C47672.43A1E810" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C47672.43A1E810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThe 15-20 deg split is what is stock in the Rx7 automobile., = Tracy essentially eliminated that split. The problem with the split is = that experience has shown that if you lose your leading ignition the = POWER falls over very considerably (estimates vary but 20-30% are = numbers bandy around). Perhaps not too bad in an auto where you seldom = need over 20-25%, but of course a different story in aircraft. I do not doubt that you get better combustion efficiency by having the = split. The Mazda engineers must have gone to the split for a non-casual = reason probably regarding efficiency (that is a long combustion chamber) = and emissions. However, giving up 20-30% power should the lead ignition = fails was a decision that I believe Tracy made correctly - for aircraft = use. Yes, I have chatted with Leon quite a bit in the past. Not much for the = last couple of months though for obvious reasons. But, I certainly know = of no one who can match Leon's experience and knowledge with the rotary = particularly at the more technical end of things. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Friday, July 30, 2004 6:12 PM Subject: [FlyRotary] Re: Turbo and the EC2 It could be that since with boost you have higher combustion chamber = pressure which supposedly leads to faster=20 As you know, Leon's only just now coming back "on cam" from his = illness. He didn't go into why, but he did say that there HAS to be a = 15 - 20 split between leading and trailing to make the mixture burn = properly. He's already persuaded at least one ECU manufacturer to = incorporate this feature. He says that otherwise you will "scatter" your = engine. Gotta love the aussie language. :). =20 Leon know so much he leaves me in the dust a bit. I understand that = you (Ed) have had various conversations with Leon in the past. Perhaps = it would help if you got him to explain this stuff to you, then maybe = relay it to Tracy for the good of all. John ------=_NextPart_000_0009_01C47672.43A1E810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
The 15-20 deg split is what is stock in = the Rx7=20 automobile.,  Tracy essentially eliminated that split.  The = problem=20 with the split is that experience has shown that if you lose your = leading=20 ignition the POWER falls over very considerably (estimates vary but = 20-30% are=20 numbers bandy around).  Perhaps not too bad in an auto where you = seldom=20 need over 20-25%, but of course a different story in = aircraft.
 
I do not doubt that you get better = combustion=20 efficiency by having the split.  The Mazda engineers must have gone = to the=20 split for a non-casual reason probably regarding efficiency (that is a = long=20 combustion chamber) and emissions.  However, giving up 20-30% power = should=20 the lead ignition fails was a decision that I believe Tracy made = correctly - for=20 aircraft use.
 
Yes, I have chatted with Leon quite a = bit in the=20 past.  Not much for the last couple of months though for obvious=20 reasons.  But, I certainly know of no one who can match Leon's = experience=20 and knowledge with the rotary particularly at the more technical end of=20 things.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 John=20 Slade
Sent: Friday, July 30, 2004 = 6:12 PM
Subject: [FlyRotary] Re: Turbo = and the=20 EC2

 It could be = that since with=20 boost you have higher combustion chamber pressure which supposedly = leads to=20 faster
 
As you know, = Leon's only=20 just now coming back "on cam" from his illness.  = He didn't go into why, but = he did say=20 that there HAS to be a 15 - 20 split between leading and trailing = to make=20 the mixture burn properly. He's already persuaded at least one ECU=20 manufacturer to incorporate this feature. He says that otherwise = you will=20 "scatter" your engine. Gotta love the aussie language.=20 :).     
 
Leon=20 know so much he leaves me in the dust a bit. I understand that you = (Ed) have=20 had various conversations with Leon in the past. Perhaps it would help = if you=20 got him to explain this stuff to you, then maybe relay it to Tracy for = the=20 good of all.
John
 
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