X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 11 Oct 2010 12:13:18 -0400 Message-ID: X-Original-Return-Path: Received: from web57516.mail.re1.yahoo.com ([66.196.101.69] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with SMTP id 4501299 for lml@lancaironline.net; Mon, 11 Oct 2010 08:14:36 -0400 Received-SPF: none receiver=logan.com; client-ip=66.196.101.69; envelope-from=casey.gary@yahoo.com Received: (qmail 61223 invoked by uid 60001); 11 Oct 2010 12:14:00 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=UZuOEIK9y6IqJnQCq2DrTNilgvJ16jPQ3j7oei6OL4Cdy3WZeTl0HeLVKbCWuzRBT15jzrQEcYWz9ZIfEWk/IJ6viKquF55/V0w63TsHsVlNbU+bNKeUy3zYkczfsr+zJbQrKcui9eInovfa1QpIQmYwgVrXMckYCF99kJRnMTI=; X-Original-Message-ID: <656053.58878.qm@web57516.mail.re1.yahoo.com> X-YMail-OSG: PmRNAdEVM1mU8NiRgUxOiiqNiqgwkr4nDDJ3Y1yRBzoMz58 NqOgQvDZomr57QCkcvLpnQRPuXRBst2bWSPmgrO7aCrB9onuvwwQK9Ob_vQm YGuiRpdXSjrUGA2O7IvQDosGhSffugbmo2zb86UE5XUAheiChNbj4SJTWu_o tZ1sIbXsGe4zsbUCop6rt1XQRpvRw34l0zYCQdJ58pLtO6EnXlUSKwjTCt2_ Vm7VlYBiOcXBcaIXe8vEyxbD2tvwNcj6vhEtNpu8uI3fmW6iviPb89z4WPQo 4FWi.01Vwqj5098UjFchfVTC2fA-- Received: from [97.122.156.192] by web57516.mail.re1.yahoo.com via HTTP; Mon, 11 Oct 2010 05:14:00 PDT X-Mailer: YahooMailRC/504.5 YahooMailWebService/0.8.106.282862 References: X-Original-Date: Mon, 11 Oct 2010 05:14:00 -0700 (PDT) From: Gary Casey Subject: Re: Slick Magneto and Spark Plugs X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1288735785-1286799240=:58878" --0-1288735785-1286799240=:58878 Content-Type: text/plain; charset=us-ascii Everything Isaac said makes sense to me. I didn't look at a Slick mag, but Bendix mags usually have a plug on either side - the bottom one has a hole and the top doesn't, supposedly to drain the water. In a pressurized mag I don't think it matters that the drain is at the bottom as the air flow through it when hot will dry out the mag. I do believe the lack of a vent hole will lead to corrosion due to water. As long as the vent is away from the air inlet it should work. Drill it through the side of the case? Why not, but that's easier said than done. I would drill a .060 hole almost all the way through and then finish with the .020. And I share Isaac's reluctance to drill into the (variable reluctance :-) sensor. As for removing the resistor, I only question the "wears out the plugs very quickly" comment. Sure, the electrode erosion will be higher, but I'm not convinced it will be a lot higher. The biggest reason, in my opinion, for the resistor is to reduce radio interference, and I doubt if it makes a big difference. And if the spark has enough energy to light the fire, a "stronger" spark won't make a significant difference. For years I built ignition systems that used standard production resistor wires for race cars - and we were getting 850 hp from 180 cubic inches. If the resistors have a resistance of less than 2K Ohms, I don't think there is much reason to take them out. But, that's not to say there won't be any improvement at all. Gary October 10, 2010 8:57:35 AM MDT From: "Isaac Heizer" ..... He says this can cure a host of otherwise mysterious "rough running" problems and forestall future problems. He said some Reno racers remove the resistor and replace it with a piece of copper wire to get a much hotter spark for racing. Says it wears out the spark plugs very quickly -- but does make a performance difference. Is this true? -isaac --0-1288735785-1286799240=:58878 Content-Type: text/html; charset=us-ascii

Everything Isaac said makes sense to me. I didn't look at a Slick mag, but Bendix mags usually have a plug on either side - the bottom one has a hole and the top doesn't, supposedly to drain the water. In a pressurized mag I don't think it matters that the drain is at the bottom as the air flow through it when hot will dry out the mag. I do believe the lack of a vent hole will lead to corrosion due to water. As long as the vent is away from the air inlet it should work. Drill it through the side of the case? Why not, but that's easier said than done. I would drill a .060 hole almost all the way through and then finish with the .020. And I share Isaac's reluctance to drill into the (variable reluctance :-) sensor.

As for removing the resistor, I only question the "wears out the plugs very quickly" comment. Sure, the electrode erosion will be higher, but I'm not convinced it will be a lot higher. The biggest reason, in my opinion, for the resistor is to reduce radio interference, and I doubt if it makes a big difference. And if the spark has enough energy to light the fire, a "stronger" spark won't make a significant difference. For years I built ignition systems that used standard production resistor wires for race cars - and we were getting 850 hp from 180 cubic inches. If the resistors have a resistance of less than 2K Ohms, I don't think there is much reason to take them out. But, that's not to say there won't be any improvement at all.

Gary

October 10, 2010 8:57:35 AM MDT

From:

"Isaac Heizer" <ijheizer@comcast.net>

..... He says this can cure a host of otherwise mysterious "rough running" problems and forestall future problems.

He said some Reno racers remove the resistor and replace it with a piece of copper wire to get a much hotter spark for racing. Says it wears out the spark plugs very quickly -- but does make a performance difference. Is this true?

-isaac

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