Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 15 Feb 2005 13:09:35 -0500 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.14.236.16] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP-TLS id 729607 for lml@lancaironline.net; Tue, 15 Feb 2005 10:35:22 -0500 Received-SPF: none receiver=logan.com; client-ip=68.14.236.16; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.1/8.13.1/Debian-12) with SMTP id j1FFYY3B032266 for ; Tue, 15 Feb 2005 08:34:34 -0700 X-Original-Message-ID: <005a01c51373$0d4e01b0$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: EGT's on O-360 X-Original-Date: Tue, 15 Feb 2005 08:28:46 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0057_01C51338.5DE37050" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Virus-Scanned: clamd / ClamAV version 0.75-1, clamav-milter version 0.75c on linux X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0057_01C51338.5DE37050 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable With this thread winding down I could not help but offer food for = thought. George said: 1) If you advance the timing, the EGTS will drop. 2) If hold the spark initiation timing event to a constant value, = and you use a spark source that provides a more consistent and quicker formation = of the flame kernel, the EGTs will drop slightly. 3) If you use a "standard" ignition source, but advance the = timing slightly, you get exactly the same combustion event with the same = horsepower and the same peak pressure and the same Theta-pp, as you get with item = 2), above. =20 It is fundamentally simple. That is all there is to it. =20 Really... Have you ever had one mag drop 300 to 500 RPM during run up? Then, run = the engine at higher power and leaner, re-check the bad mag and have the = drop be 50 RPM. Unless JC dropped in for a quick parts change that I = could not detect, the ignition source did not change. So...what caused = this condition? We all talk about "fuel rich", carbon and oil fouled = plugs. Why won't they fire? Could it be there is not enough spark = energy? If this is so...would more spark energy help? Try setting the = spark plug gap at .080"....I'll bet the engine will start and run but = maybe a little rough and maybe it won't even start and run after 50 hrs. = When the engine is running "rough"....is it misfiring? Is it the same = cylinder every time that misfires? Why does an engine misfire at WOT = and not at idle? Why does an engine misfire through the plug wires when = the engine is wet? I'm not looking for answers...I have them. Would = more spark energy change/help all of this? I personally think a = standard mag is a marginal choice for turbo charged or high compression = 6 cylinder engines. I do believe a standard mag will make them start = and run, but I don't believe that is all there is to it. Oh...I also = believe that all of these marginal conditions can affect EGT. I also = believe that if all the ignition hardware is functioning satisfactorily, = then "that is all there is to it". Finally, the auto industry has = evolved for mags, to battery ignition, to HEI , to individual coils at = each cylinder with very short secondary leads. I do enjoy this site...thanks for all of the inputs. Craig Berland ------=_NextPart_000_0057_01C51338.5DE37050 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

With this thread winding down I could = not help but=20 offer food for thought.

George=20 said:
1)   If you advance the timing, = the EGTS=20 will drop.
    2)   If hold the spark=20 initiation timing event to a constant value, and you
use a = spark source=20 that provides a more consistent and quicker formation of
the flame=20 kernel, the EGTs will drop slightly.
    = 3) =20    If you use a =93standard=94 ignition source, but = advance the=20 timing
slightly, you get exactly the same combustion event with = the=20 same horsepower
and the same peak pressure and the same Theta-pp, as = you get=20 with item 2),
above.
It is = fundamentally=20 simple. That is all there is to it.

Really...

Have you ever had one mag drop 300 to 500 RPM during run up? = Then,=20 run the engine at higher power and leaner, re-check the bad mag and have = the=20 drop be 50 RPM. Unless JC dropped in for a quick parts change that I = could=20 not detect, the ignition source did not change. So...what = caused this=20 condition? We all talk about "fuel rich", carbon and oil fouled=20 plugs. Why won't they fire? Could it be there is not enough = spark=20 energy? If this is so...would more spark energy help? Try = setting=20 the spark plug gap at .080"....I'll bet the engine will start and run = but maybe=20 a little rough and maybe it won't even start and run after 50 hrs. = When=20 the engine is running "rough"....is it misfiring? Is it the same = cylinder=20 every time that misfires? Why does an engine misfire at WOT and = not at=20 idle? Why does an engine misfire through the plug wires when the = engine is=20 wet? I'm not looking for answers...I have them. Would more = spark=20 energy change/help all of this? I personally think a standard mag = is a=20 marginal choice for turbo charged or high compression 6 cylinder = engines. =20 I do believe a standard mag will make them start and run, but I don't = believe=20 that is all there is to it. Oh...I also believe that all of these = marginal=20 conditions can affect EGT. I also believe that if all the ignition = hardware=20 is functioning satisfactorily, then "that is all there is to it". = Finally, the=20 auto industry has evolved for mags, to battery ignition, to HEI , to = individual=20 coils at each cylinder with very short secondary leads.

I do enjoy this site...thanks for = all of the=20 inputs.

Craig Berland

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