X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from alnrmhc11.comcast.net ([204.127.225.91] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2096323 for flyrotary@lancaironline.net; Mon, 11 Jun 2007 10:27:53 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.225.91; envelope-from=rlwhite@comcast.net Received: from rlwhite (c-68-35-160-229.hsd1.nm.comcast.net[68.35.160.229]) by comcast.net (alnrmhc11) with SMTP id <20070611142655b1100g7lh2e>; Mon, 11 Jun 2007 14:27:15 +0000 Date: Mon, 11 Jun 2007 08:27:39 -0600 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] MSD type Ignition CD or not? was Re: Spark Plug Cleaning Message-Id: <20070611082739.66d05a95.rlwhite@comcast.net> In-Reply-To: References: X-Mailer: Sylpheed 2.4.2 (GTK+ 2.10.11; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Ed, All of the regular MSD systems are CD's. I sort of wonder if the Blaster coils are or not, and if they are do they have the same energy levels of the other MSD systems. I think I've seen that the multiple spark feature goes away at higher RPM's because of time constraints. Bob W. On Mon, 11 Jun 2007 10:01:01 -0400 "Ed Anderson" wrote: > Given the interest in getting rid of SAG - its important that we are all on the same wavelength when discussing components. For example, there are a whole bunch of different MSD ignition systems out there - I'm not certain that they are all Capacitive Discharge types. It may made a difference regarding their ability to avoid/delay on set of SAG. > > At least Lynn's assessment about the rise time of the CD type driven coils being so fast as not to permit much voltage leakage via the lead deposits and thereby avoiding SAG seemed to make sense to me. > > So the question to Bob Mears is do you recall whether the MSD system being used was a Capacitive Discharge type? Thanks! > > Ed > ----- Original Message ----- > From: bmears9413@aol.com > To: Rotary motors in aircraft > Sent: Monday, June 11, 2007 8:56 AM > Subject: [FlyRotary] Re: Spark Plug Cleaning > > > SAG can appear any where apparently. We ran a MSD system on our race care and still ran into the problem. The problem ended when we switched to alcohol, but thats not a fix for airplanes! > > Bob Mears > Supermarine spitfire > > > > -- N93BD - Rotary Powered BD-4 - http://www.bob-white.com 3.8 Hours Total Time and holding Cables for your rotary installation - http://www.roblinphoto.com/shop/