X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Jan 2008 00:29:54 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-masked.atl.sa.earthlink.net ([209.86.89.68] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2631535 for lml@lancaironline.net; Fri, 04 Jan 2008 21:39:24 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.68; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=JevVgxPBZiyuwES+9zMcH05IexeRa17rmU4v+4Nlc+LiZ3bLBSugMty/PdEAKb67; h=Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [74.93.196.177] (helo=DFWK3391) by elasmtp-masked.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1JAyvt-0007eb-E6 for lml@lancaironline.net; Fri, 04 Jan 2008 21:38:45 -0500 X-Original-Message-ID: <003d01c84f44$163128b0$1dd0a60a@DFWK3391> From: "Douglas Brunner" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Electronic Ignition X-Original-Date: Fri, 4 Jan 2008 21:38:42 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003A_01C84F1A.2D184B50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac01a238acc8405a5b04cf4ce6e9095d6cee2a65363551b7527350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.177 This is a multi-part message in MIME format. ------=_NextPart_000_003A_01C84F1A.2D184B50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Grayhawk, Thanks for the link. I have been reading the Cafe Articles. I realize that the Prism will have electronic ignition, but the ignition = timing will be controlled by measured intracylinder pressures. This is = very different from an electronic ignition that uses an advance curve = that depends on RPM and MAP and ignores the effect of mixture on = effective timing. ----- Original Message -----=20 From: Sky2high@aol.com=20 To: lml@lancaironline.net=20 Sent: Friday, January 04, 2008 7:55 PM Subject: [LML] Re: Electronic Ignition In a message dated 1/4/2008 7:33:25 A.M. Central Standard Time, = douglasbrunner@earthlink.net writes: I have been thinking a little bit about this issue. I would like to = add my 2 cents and see what others (particularly Adkinson and Braly) have to say = about this issue. Doug, Go here: http://cafefoundation.org/v2/research_reports.php and read Ignition Dynamics I, II & III. 20 or 25 Degrees BTDC (depending on compression ratio) provides a = reasonable compromise for standard flying at 75% (plus or minus a bit). = The timing makes a bigger difference at higher altitudes where NA = engines are operating at reduced power enforced by lack of MAP. The EI = also makes a big difference in starting and high power operations - like = take off. If the PRISM system ever becomes available, it will have an electronic = ignition. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Pilot not TSO'd, Certificated score only > 70%. -------------------------------------------------------------------------= ----- Start the year off right. Easy ways to stay in shape in the new year. ------=_NextPart_000_003A_01C84F1A.2D184B50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Grayhawk,
 
Thanks for the link.  I have been reading the Cafe = Articles.
 
I realize that the Prism will have electronic ignition, but the = ignition=20 timing will be controlled by measured intracylinder = pressures.  This=20 is very different from an electronic ignition that uses an advance curve = that=20 depends on RPM and MAP and ignores the effect of mixture on effective=20 timing.
----- Original Message -----
From:=20 Sky2high@aol.com=20
Sent: Friday, January 04, 2008 = 7:55=20 PM
Subject: [LML] Re: Electronic=20 Ignition

In a message dated 1/4/2008 7:33:25 A.M. Central Standard Time, = douglasbrunner@earthlink.net= =20 writes:
I have been thinking a little bit about this issue.  I = would like=20 to add my 2 cents
and see what others (particularly Adkinson and Braly) have = to say=20 about this issue.
Doug,
 
Go here:
 
http://cafefou= ndation.org/v2/research_reports.php
 
and read Ignition Dynamics I, II & III.
 
20 or 25 Degrees BTDC (depending on compression ratio)=20 provides a reasonable compromise for standard flying at = 75%=20 (plus or minus a bit).  The timing makes a bigger = difference at=20 higher altitudes where NA engines are operating at reduced power = enforced by=20 lack of MAP.  The EI also makes a big difference in starting and = high=20 power operations - like take off.
 
If the PRISM system ever becomes available, it will have an = electronic=20 ignition.
 
Scott=20 Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Pilot not TSO'd, Certificated score only >=20 70%.



Start the year off right. Easy ways to stay in shape in the new year.=20
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