X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 12 Oct 2010 20:47:29 -0400 Message-ID: X-Original-Return-Path: Received: from qmta02.emeryville.ca.mail.comcast.net ([76.96.30.24] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4502273 for lml@lancaironline.net; Mon, 11 Oct 2010 22:33:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.24; envelope-from=ijheizer@comcast.net Received: from omta22.emeryville.ca.mail.comcast.net ([76.96.30.89]) by qmta02.emeryville.ca.mail.comcast.net with comcast id HdqV1f0051vN32cA2eZ68j; Tue, 12 Oct 2010 02:33:06 +0000 Received: from sz0109.ev.mail.comcast.net ([76.96.26.169]) by omta22.emeryville.ca.mail.comcast.net with comcast id HeZ61f0013eudEs8ieZ6wr; Tue, 12 Oct 2010 02:33:06 +0000 X-Original-Date: Tue, 12 Oct 2010 02:33:05 +0000 (UTC) From: Isaac Heizer X-Original-To: lml@lancaironline.net X-Original-Message-ID: <385063816.215870.1286850785954.JavaMail.root@sz0109a.emeryville.ca.mail.comcast.net> In-Reply-To: <1877413249.215749.1286850770670.JavaMail.root@sz0109a.emeryville.ca.mail.comcast.net> Subject: Re: Slick Magneto and Spark Plugs MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_215869_1854522682.1286850785953" X-Originating-IP: [24.17.111.1] X-Mailer: Zimbra 6.0.5_GA_2431.RHEL5_64 (ZimbraWebClient - FF3.0 (Win)/6.0.5_GA_2427.RHEL4) ------=_Part_215869_1854522682.1286850785953 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit I should have been clearer regarding the tach sensor. My aircraft has a G900X and Slick 6320 pressurized mags. Installing the G900X involved removing one mag's pressure vent plug and replacing it with a UMA T1A9-1 tach mag pickup. This particular UMA sensor is really not supposed to be used on pressurized mags because it doesn't have a vent hole; and sure enough it led to moisture buildup in one of my plane's mags (350 hours). The person at Aircraft Magneto Service told me the spark plug resistor isn't there so much for RFI suppression as it is for current limiting and shaping. He said the ignition harness acts as a capacitor, and the harness + resistor + spark plug form an RC network and thus affect the shape of the current pulse(s) inside the magneto. He said removing the resistor not only leads to rapid spark plug wear, but also stresses the magneto and associated components. At least that's what I think he was telling me..... I have no intention of substituting a 0 ohm resistor in the spark plug....i was just wondering if any of our Reno racers really do it and see any difference. -isaac ES-P N7842K ------=_Part_215869_1854522682.1286850785953 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <= div style=3D'font-family: Arial; font-size: 12pt; color: #000000'>I should = have been clearer regarding the tach sensor. My aircraft has a G900X = and Slick 6320 pressurized mags. Installing the G900X involved removi= ng one mag's pressure vent plug and replacing it with a UMA T1A9-1 tach mag= pickup. This particular UMA sensor is really not supposed to be used= on pressurized mags because it doesn't have a vent hole; and sure en= ough it led to moisture buildup in one of my plane's mags (350 hours).
<= br>The person at Aircraft Magneto Service told me the spark plug resistor i= sn't there so much for RFI suppression as it is for current limiting and sh= aping. He said the ignition harness acts as a capacitor, and the harn= ess + resistor + spark plug form an RC network and thus affect the shape of= the current pulse(s) inside the magneto. He said removing the resist= or not only leads to rapid spark plug wear, but also stresses the magneto a= nd associated components. At least that's what I think he was telling= me.....

I have no intention of substituting a 0 ohm resistor in the= spark plug....i was just wondering if any of our Reno racers really do it = and see any difference.

-isaac
ES-P N7842K

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