Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 28 Mar 2004 15:32:59 -0500 Message-ID: X-Original-Return-Path: Received: from [68.89.254.181] (HELO sdf1.mail.taturbo.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3131587 for lml@lancaironline.net; Sun, 28 Mar 2004 14:39:26 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C414FC.8938204C" Subject: RE: [LML] Re: lower EGTs content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.0.6487.1 X-Original-Date: Sun, 28 Mar 2004 13:40:33 -0600 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: lower EGTs Thread-Index: AcQU00wg0b56n8KzRtymMy+bs8/edgAKXZ8A From: "George Braly" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C414FC.8938204C Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wendell,=20 =20 Take a look at my detailed response to Scott. =20 Your general understanding of the theory of electronic ignition = "benefits" is mostly correct - - but the implications that this results = in a "better" combustion event and a better outcome for the cylinder = does not necessarily follow.=20 =20 Keep in mind, that after even the "best" spark event, it takes a while = for the combustion flame front to get organized. Once it is organized, = the spark is long finished, and the flame front doesn't "know or care" = if it was a spark plug or a match that started the event. =20 Regards, George =20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of = Wendell & Jean Durr Sent: Sunday, March 28, 2004 8:44 AM To: Lancair Mailing List Subject: [LML] Re: lower EGTs '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.' =20 =20 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 --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.595 / Virus Database: 378 - Release Date: 2/25/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.595 / Virus Database: 378 - Release Date: 2/25/2004 =20 ------_=_NextPart_001_01C414FC.8938204C Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Wendell,

Take a look at my = detailed=20 response to Scott.

Your general understanding of the theory of electronic ignition = "benefits" is mostly correct - - but the implications that this results = in a=20 "better" combustion event and a better outcome for the cylinder = does not=20 necessarily follow.

Keep=20 in mind, that after even the "best" spark event, it takes a = while=20 for the combustion flame front to get organized. Once it is=20 organized, the spark is long finished, and the flame front doesn't = "know=20 or care" if it was a spark plug or a match that started the=20 event.

Regards, George

-----Original Message-----
From: Lancair Mailing = List=20 [mailto:lml@lancaironline.net]On Behalf Of Wendell & Jean=20 Durr
Sent: Sunday, March 28, 2004 8:44 AM
To: = Lancair=20 Mailing List
Subject: [LML] Re: lower = EGTs

'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=20 higher voltage allowing a larger plug gap, all seemingly contributors = to more=20 complete consumption of the fuel/air charge.

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

---
Incoming mail is certified Virus = Free.
Checked by=20 AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.595 / = Virus=20 Database: 378 - Release Date:=20 2/25/2004

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Checked by AVG anti-virus system (http://www.grisoft.com).
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