Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 28 Mar 2004 09:50:19 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m17.mx.aol.com ([64.12.138.207] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3130872 for lml@lancaironline.net; Sun, 28 Mar 2004 08:06:32 -0500 Received: from Sky2high@aol.com by imo-m17.mx.aol.com (mail_out_v37_r1.2.) id q.1a7.2188a009 (25305) for ; Sun, 28 Mar 2004 08:06:26 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <1a7.2188a009.2d9827d1@aol.com> X-Original-Date: Sun, 28 Mar 2004 08:06:25 EST Subject: Reply to Reply on "lower EGT temps" X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1080479185" X-Mailer: 9.0 for Windows sub 810 -------------------------------1080479185 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 3/27/2004 10:40:15 PM Central Standard Time, walter@advancedpilot.com writes: 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. Walter, Pleeeeeeease. I know that the sky is falling and my engine is headed for doomsday 'cause I haven't been to an advanced pilot seminar - but, at least try to help us understand why our observations, experience and understanding of ignition events at altitude are not just the product of hypoxia induced lightheadedness. 1. You mean the PRISM system doesn't use modern electronic ignition components and controls, including timing? 2. Do you mean that fixed timing, developed via compromise, is the best for all operating conditions? 3. Do you mean that the spark energy, shape, duration and consistency is of the same quality for electronic ignitions and magnetos? 4. Are you telling me that our excess fuel delivery systems are so good that no combustion is occurring in the exhaust pipe near the EGT probe? 5. Do you mean that magnetos deliver a consistent spark (time, duration and strength) 100% of the time when one manufacturer states that there can be magneto spark impairments of up to 10% of the time? And, that this deficient combustion in the cylinder might lead to some combustion completion in the pipe? Considering my experience, that ".. magnetos and electronic devices and find that the actual spark event does not coincide" is a good thing. Scott Krueger PS: BTW, For my Lyc I/O 320, electronic spark advance does not occur above 26" MAP (generally below 4500-5000 Palt), and then gingerly so thereafter with little power effect, even with the reduced fuel flows. For my case this is yet awaiting further study. Still, above 26" I see reduced EGTs. PPS: How accurate should the timing be? + or - 2 degrees? + or - ? degrees? -------------------------------1080479185 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 3/27/2004 10:40:15 PM Central Standard Time,=20 walter@advancedpilot.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>That is=20 an indicator that the REAL timing is NOT right. Lower EGTS are the=20 result of advanced timing. This is NOT good. If the timing is=20 correct the EGTs will NOT be lower. PERIOD. This is one exampl= e of=20 when lower temps are NOT good.

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

Walter,

Pleeeeeeease. I know that the sky is falling and my engine is hea= ded=20 for doomsday 'cause I haven't been to an advanced pilot seminar - but, at le= ast=20 try to help us understand why our observations, experience and understanding= of=20 ignition events at altitude are not just the product of hypoxia induced=20 lightheadedness.

1. You mean the PRISM system doesn't use modern electronic=20 ignition components and controls, including timing?

2. Do you mean that fixed timing, developed via compromise, is the best= for=20 all operating conditions?

3. Do you mean that the spark energy, shape, duration and consistency i= s of=20 the same quality for electronic ignitions and magnetos?

4. Are you telling me that our excess fuel delivery systems are so good= =20 that no combustion is occurring in the exhaust pipe near the EGT probe?

5. Do you mean that magnetos deliver a consistent spark (time, duration= and=20 strength) 100% of the time when one manufacturer states that there can=20 be magneto spark impairments of up to 10% of the time? And, t= hat=20 this deficient combustion in the cylinder might lead to some combustion= =20 completion in the pipe?

Considering my experience, that ".. magnetos and electronic device= s=20 and find that the actual spark event does not coincide" is a good=20 thing.

Scott Krueger

PS: BTW, For my Lyc I/O 320, electronic spark advance does not occur ab= ove=20 26" MAP (generally below 4500-5000 Palt), and then gingerly so thereafter wi= th=20 little power effect, even with the reduced fuel flows. For my case thi= s=20 is yet awaiting further study. Still, above 26" I see reduced=20 EGTs.

PPS: How accurate should the timing be? + or - 2 degrees? + or - ?=20 degrees?

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