X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 932609 for flyrotary@lancaironline.net; Thu, 19 Jan 2006 06:33:41 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=atlasyts@bellsouth.net Received: from ibm56aec.bellsouth.net ([65.8.117.159]) by imf16aec.mail.bellsouth.net with ESMTP id <20060119113255.TZIQ2157.imf16aec.mail.bellsouth.net@ibm56aec.bellsouth.net> for ; Thu, 19 Jan 2006 06:32:55 -0500 Received: from [192.168.0.100] (really [65.8.117.159]) by ibm56aec.bellsouth.net with ESMTP id <20060119113254.PHVZ1137.ibm56aec.bellsouth.net@[192.168.0.100]> for ; Thu, 19 Jan 2006 06:32:54 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-4-449407790 Message-Id: From: Bulent Aliev Subject: Re: [FlyRotary] Re: LS1 Coil Failures Date: Thu, 19 Jan 2006 06:33:17 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.746.2) --Apple-Mail-4-449407790 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed On Jan 19, 2006, at 12:23 AM, Bob White wrote: > Hi David, > > There is one version of the MSD coil that is a direct replacement for > the LS1 coil. I'm sort of making an assumption that it is a multiple > spark coil. I can't remember right now if Lynn is using leaded fuel > either, but I think better firing of wet plugs is accurate. That's a > good thing too. :) > > Bob W. here is what Lynn said: No distributor is needed. The MSD 6T for dirt circle track service is what we started with, but switched to the 6AL because the rev chip plugs into the side of the main box, instead of a secondary box with a cannon plug. The 6T is potted for strength is the other difference. If the funds are available to have a 4 cylinder Mag on the trailing plugs, then I would rig up a drive for any real aircraft Mag and grind off two of the points cam lobes and spin the Mag at crank speed with a little toothed belt. The trailing must be distributed because one trailing chamber is mixture laden and is exposed to the plug when the other is firing. Lost spark on the leading is just fine. I would trigger the leading MSD from a disc or reluctor on the crank pulley. I used the pickup from any Chrysler distributor. They are available in any parts house for about $4.00. I drilled off the rivet heads and flipped the coil around so the mounting holes are out in the open. I use brass screws from the hobby shop to replace the rivets, so as not to short out the flux field. If you rev it up and see the timing retard a bit, just reverse the wires from the pickup coil. You want to trigger on the flat front of the spike so the reluctor will be just a hair past dead in front of the reluctor. Easy to set up that way. If you TIG the magnet side of the pickup coil to a small steel plate with slotted mounting holes you can move the timing around a bit and control reluctor clearance. A crank triggered system is so stable that you will think the timing light looks like a flashlight shining on a stopped engine. There will be two reluctors on the crank pulley, and one pickup coil to drive the MSD. The MSD output will be driving a double ended coil, with one coil wire going to each leading plug. I think MSD has a coil just for this type of installation. Use only an MSD approved coil, or coils if you want one for each plug. The MSD will incinerate some of them. The coil primary will be running at 400 volts instead of 12. Use inductive coil wire for the run to the plugs. Don't get near any plugs or plug wire or boots while on or running. The MSD will fire once when you turn it on. And once when you shut it off. So the prop may move with surprising authority when the switch is turned on. So yell clear before touching the switch. No curves at all. Just 22 to 24 degrees fixed, is fine for up to 9,000 RPM. It will start easy, idle and run fine at anything between 20 and 27 degrees for a 13B. --Apple-Mail-4-449407790 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1

=

On Jan 19, 2006, at 12:23 AM, Bob White = wrote:

Hi David,

There is = one version of the MSD coil that is a direct replacement for
the LS1 coil.=A0= I'm sort of making an assumption that it is a multiple
spark coil.=A0 = I can't remember right now if Lynn is using leaded fuel
either, but I think better firing of wet plugs is = accurate.=A0 That's = a
good thing too. :)

Bob = W.

here= is what Lynn said:
No distributor = is needed.
The MSD 6T for = dirt circle track service is what we started with, but switched to the = 6AL because the rev chip plugs into the side of the main box, instead of = a secondary box with a cannon plug. The 6T is potted for strength is the = other difference.

=A0

If the funds are = available to have a 4 cylinder Mag on the trailing plugs, then I would = rig up a drive for any real aircraft Mag and grind off two of the points = cam lobes and spin the Mag at=A0crank speed=A0with a little toothed = belt. The trailing must be distributed because one trailing chamber is = mixture laden and=A0is exposed to the plug when the other is = firing.

=A0

Lost spark on = the leading is just fine. I would trigger the leading MSD from a disc or = reluctor on the crank pulley. I used the pickup from any Chrysler = distributor. They are available in any parts house for about $4.00. I = drilled off the rivet heads and flipped the coil around so the mounting = holes are out in the open. I use brass screws from the hobby shop to = replace the rivets, so as not to short out the flux field. If you rev it = up and see the timing retard a bit, just reverse the wires from the = pickup coil. You want to trigger on the flat front of the spike so the = reluctor will be just a hair past dead in front of the reluctor. Easy to = set up that way.
If you TIG the = magnet side of the pickup coil to a small steel plate with slotted = mounting holes you can move the timing around a bit and control reluctor = clearance.

=A0

A crank = triggered system is so stable that you will think the timing light looks = like a flashlight shining on a stopped engine.

=A0

There will be two reluctors on the crank pulley, and one pickup = coil to drive the MSD. The MSD output will be driving a double ended = coil, with one coil wire going to each leading plug. I=A0think MSD has=A0a= coil=A0just for this type of installation. Use only an MSD approved = coil, or coils if you want one for each plug. The MSD will incinerate = some of them. The coil primary will be running at 400 volts instead of = 12.

=A0

Use inductive = coil wire for the run to the plugs. Don't get near any plugs or plug = wire or boots while on or running. The MSD will fire once when you turn = it on. And once when you shut it off. So the prop may move with = surprising authority when the switch is turned on. So yell clear before = touching the switch.

=A0

No curves at = all. Just 22 to 24 degrees fixed, is fine for up to 9,000 RPM. It will = start easy, idle and run fine at anything between 20 and 27 degrees for = a 13B.
= --Apple-Mail-4-449407790--