Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 28 Mar 2004 09:44:12 -0500 Message-ID: X-Original-Return-Path: Received: from [24.116.0.121] (HELO mail.cableone.net) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3130748 for lml@lancaironline.net; Sun, 28 Mar 2004 06:40:13 -0500 Received: from Wendell (unverified [24.117.187.210]) by smail1.cableone.net (SurgeMail 1.5d2) with ESMTP id 11478346 for ; Sun, 28 Mar 2004 04:34:28 -0700 X-Original-Return-Path: X-Original-Message-ID: <00b201c414b9$7a09bba0$9865fea9@Wendell> From: "Wendell & Jean Durr" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] lower EGTs X-Original-Date: Sun, 28 Mar 2004 05:40:31 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00AF_01C41487.2F388430" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 X-Server: High Performance Mail Server - http://surgemail.com This is a multi-part message in MIME format. ------=_NextPart_000_00AF_01C41487.2F388430 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 'Use of the LASAR electronic ignition lowers the EGT actual = temperatures by 70 to 90 degrees F from that delivered by the use of = magnetos. That is an indicator that the REAL timing is NOT right. Lower EGTS are = the result of advanced timing. This is NOT good. If the timing is = correct the EGTs will NOT be lower. PERIOD. This is one example of = when lower temps are NOT good. We have tested magnetos and electronic devices and find that the actual = spark event does not coincide. This can be VERY bad.' Would not the lower EGTs with electronic ignition be caused by more = complete combustion before the exhaust valve opens to let still-burning = gases flow over the probe? My totally amateur understanding is that = electronic ignition fires earlier before top dead center at cruise rpms = than does a magneto, it fires for a longer period of time, and with = higher voltage allowing a larger plug gap, all seemingly contributors to = more complete consumption of the fuel/air charge. I'm asking in order to learn--I don't pretend to know. Wendell = Durr ------=_NextPart_000_00AF_01C41487.2F388430 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

'Use of the LASAR = electronic=20 ignition lowers the EGT actual temperatures by 70 to 90 degrees F from = that=20 delivered by the use of magnetos.

That is an indicator that the REAL timing is NOT right. = Lower=20 EGTS are the result of advanced timing. This is NOT good. If = the=20 timing is correct the EGTs will NOT be lower. PERIOD. This = is one=20 example of when lower temps are NOT good.

We have tested magnetos = and=20 electronic devices and find that the actual spark event does not = coincide.=20 This can be VERY bad.'

Would not the lower EGTs with = electronic ignition=20 be caused by more complete combustion before the exhaust valve opens to = let=20 still-burning gases flow over the probe? My totally amateur = understanding is=20 that electronic ignition fires earlier before top dead center at cruise = rpms=20 than does a magneto, it fires for a longer period of time, and with = higher=20 voltage allowing a larger plug gap, all seemingly contributors to more = complete=20 consumption of the fuel/air charge.

I'm asking in order to learn--I don't = pretend to=20 know. Wendell Durr

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