X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d03.mx.aol.com ([205.188.157.35] verified) by logan.com (CommuniGate Pro SMTP 5.1c.6) with ESMTP id 1466915 for flyrotary@lancaironline.net; Sat, 14 Oct 2006 23:54:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.35; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d03.mx.aol.com (mail_out_v38_r7.6.) id q.bf2.6f83bfb (42807) for ; Sat, 14 Oct 2006 23:54:09 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Sat, 14 Oct 2006 23:54:09 EDT Subject: Re: [FlyRotary] Re: Latest EC2 updates, Installation notes To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1160884449" X-Mailer: 9.0 Security Edition for Windows sub 5331 X-Spam-Flag: NO -------------------------------1160884449 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 10/14/2006 9:22:40 P.M. Eastern Daylight Time, mark.steitle@austin.utexas.edu writes: On a side note, after separating the coil leads, it took a much leaner mixture to get it to run smooth. Before, the best it would idle was about 1200rpm, now it will idle nicely at 900 rpm, not that I want to do that, but it shows that the improvement isn't all in my head. What sort of mechanism fires the coils? A regular Kettering system with an SCR? A field collapse will generate very high voltages in the primary circuit if no protection is built in. (like the capaciter in the old points system). Many restrikes may occur after the planned firing, and at speed, low secondary voltage from poor rise time may develop. False triggering and an induced 180 degrees out of faze preignition are possible. Just one event is too many. All wires are antenna. All secondary wires radiate RF unless they are shielded, and the shielding is grounded. I destroyed a factory Racing Pport learning this. You can see it all on an old "O" scope. Lynn E. Hanover -------------------------------1160884449 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 10/14/2006 9:22:40 P.M. Eastern Daylight Time,=20 mark.steitle@austin.utexas.edu writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2> =20 On a side note, after separating the coil leads, it took a much leaner mix= ture=20 to get it to run smooth. Before, the best it would idle was about=20 1200rpm, now it will idle nicely at 900 rpm, not that I want to do that, b= ut=20 it shows that the improvement isn't all in my head.
=20

What sort of mechanism fires the coils? A regular Kettering system with= an=20 SCR? A field collapse will generate very high voltages in the primary circui= t if=20 no protection is built in. (like the capaciter in the old points system).

Many restrikes may occur after the planned firing, and at speed, low=20 secondary voltage from poor rise time may develop. False triggering and an=20 induced 180 degrees out of faze preignition are possible. Just one event is=20= too=20 many. All wires are antenna. All secondary wires radiate RF unless they are=20 shielded, and the shielding is grounded.

I destroyed a factory Racing Pport learning this. You can see it all on= an=20 old "O" scope.

Lynn E. Hanover

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