Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 25 Mar 2003 20:13:46 -0500 Message-ID: X-Original-Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.93.67.84] verified) by logan.com (CommuniGate Pro SMTP 4.1b1) with ESMTP id 2086539 for flyrotary@lancaironline.net; Tue, 25 Mar 2003 20:11:41 -0500 Received: from mail4.carolina.rr.com (fe4 [24.93.67.51]) by ms-smtp-03.southeast.rr.com (8.12.5/8.12.2) with ESMTP id h2Q1AUm0019138 for ; Tue, 25 Mar 2003 20:10:30 -0500 (EST) Received: from o7y6b5 ([24.93.78.62]) by mail4.carolina.rr.com with Microsoft SMTPSVC(5.5.1877.757.75); Tue, 25 Mar 2003 20:13:18 -0500 X-Original-Message-ID: <002d01c2f335$a41a52c0$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Spark Plugs X-Original-Date: Tue, 25 Mar 2003 20:18:42 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01C2F30B.BB012740" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_002A_01C2F30B.BB012740 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Tuesday, March 25, 2003 5:37 PM Subject: [FlyRotary] Re: Spark Plugs >Tracy, there are a few "Standard" spark plugs which while their base = is 3/4" long, their electrodes will not=20 >clip/chip the apex seal. However, that is by no means true of = many/most "Standard" spark plugs.=20 OK. Now you guys have me worried. I got a recommendation from = somewhere to use B9EGV and B10EGV plugs. I forget who told me this, but = I'm pretty sure it was someone flying a 13B. Are these plugs ok? Will = they burn up? will they hit the apex seals? John Slade Ready to start her up & fly.... once I have an intake system. John, You are ok with the B9/10EGV plugs in so far as clearing the apex = seal. The E in the designation stands for a 3/4" screw portion. There = are, of course, many a plug with the "E" which are 3/4" long same as the = B9/!0 EGV, however, apparently there is no standard about how far an = electrode may reach beyond the base and that is what causes the problems = with clipping the apex seal. Paul Yaw had nice tech article on spark = plugs in which he points out this problem. In some cases, he actually = modified the electrodes (i.e. flattening them close to the base of the = plug) to prevent them from clipping the apex seal.=20 So, again, you are OK with B9/10EGV plugs and their are others that = may also work. Just be careful. Ed Anderson ------=_NextPart_000_002A_01C2F30B.BB012740 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 John=20 Slade
Sent: Tuesday, March 25, 2003 = 5:37=20 PM
Subject: [FlyRotary] Re: Spark=20 Plugs

>Tracy, there are a few=20  "Standard" spark plugs which while their base is 3/4" long, = their=20 electrodes will not 
>clip/chip the apex seal.  = However,=20 that is by no means true of many/most "Standard" spark=20 plugs. 
 
OK. = Now you guys=20 have me worried. I got a recommendation from somewhere to use B9EGV = and B10EGV=20 plugs. I forget who told me this, but I'm pretty sure it was someone = flying a=20 13B. Are these plugs ok? Will they burn up? will they hit the apex=20 seals?
John = Slade
Ready to start her=20 up & fly.... once I have an intake system.
 
John,
 
You are ok with the B9/10EGV plugs in = so far as=20 clearing the apex seal.  The E in the designation stands for a = 3/4" screw=20 portion.  There are, of course, many a plug with the "E" which = are 3/4"=20 long same as the B9/!0 EGV, however, apparently there is no standard = about how=20 far an electrode may reach beyond the base and that is what causes the = problems with clipping the apex seal.  Paul Yaw had nice tech = article on=20 spark plugs in which he points out this problem.  In some cases, = he=20 actually modified the electrodes (i.e. flattening them close to the = base of=20 the plug) to prevent them from clipping the apex seal.
 
So, again, you are OK with B9/10EGV = plugs and=20 their are others that may also work.  Just be = careful.
 
Ed = Anderson
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