X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1001350 for flyrotary@lancaironline.net; Tue, 14 Jun 2005 02:19:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.2; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m21.mx.aol.com (mail_out_v38_r1.7.) id q.f7.527ccc14 (48576) for ; Tue, 14 Jun 2005 02:18:26 -0400 (EDT) From: WRJJRS@aol.com Message-ID: Date: Tue, 14 Jun 2005 02:18:25 EDT Subject: Re: [FlyRotary] Re: Engine Not Starting To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1118729905" X-Mailer: 9.0 SE for Windows sub 5012 -------------------------------1118729905 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/13/2005 9:24:46 PM Pacific Standard Time, tim2542@sbcglobal.net writes: >I do not understand the spark out of the engine and possibly none inside >unless the cranking compression is making it harder to actually arc. >Maybe someone else understands it. Bernie, Voltage requirement is directly proportional to pressure. I'm not the EE in the group but I'm sure there are tables for it somewhere. There is something else to look for guys especially on plugs that have been cleaned. Look for a dark line on the insulator. This often requires a magnifier. This is a carbon path that has been developed on the plug while firing a flooded or very rich mixture. It can be VERY hard to clean off. You can sometimes even see the spark jumping down that path. Even if you have a spark there it usually won't ignite the charge in the combustion chamber. If you see a line of any kind on the porcelain disguard the plug. The path makes it easier to foul the plug later. Bill Jepson -------------------------------1118729905 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 6/13/2005 9:24:46 PM Pacific Standard Time,=20 tim2542@sbcglobal.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>>I do=20 not understand the spark out of the engine and possibly none=20 inside
>unless the cranking compression is making it harder to actua= lly=20 arc.
>Maybe someone else understands it.
Bernie, Voltage requirement is directly proportional to pressure. I'm n= ot=20 the EE in the group but I'm sure there are tables for it somewhere. There is= =20 something else to look for guys especially on plugs that have been cleaned.=20= Look=20 for a dark line on the insulator. This often requires a magnifier. This is a= =20 carbon path that has been developed on the plug while firing a flooded or ve= ry=20 rich mixture. It can be VERY hard to clean off. You can sometimes even see t= he=20 spark jumping down that path. Even if you have a spark there it usually= =20 won't ignite the charge in the combustion chamber. If you see a line of any=20= kind=20 on the porcelain disguard the plug. The path makes it easier to foul the plu= g=20 later.
Bill Jepson
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