X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 5.1.0) with ESMTP id 1486667 for flyrotary@lancaironline.net; Thu, 19 Oct 2006 13:31:04 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao10.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20061019173026.LAXC18985.fed1rmmtao10.cox.net@fed1rmimpo02.cox.net> for ; Thu, 19 Oct 2006 13:30:26 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id cHWV1V00R1xAn3c0000000 Thu, 19 Oct 2006 13:30:29 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Spark plugs Date: Thu, 19 Oct 2006 10:30:34 -0700 Message-ID: <000001c6f3a4$48aa1510$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C6F369.9C4B3D10" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C6F369.9C4B3D10 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I'm using NKG B9EGV plugs in my 20B, based on Paul Yaw's recommendation, with apparently good performance. They now have 20-25 hours since = installed through all the dyno runs, engine tuning and some flying. I took them = out for a look and they have a bit more deposits than I expected, and some = areas nearly black. The electrodes still look OK, and the gaps are still = close to .025 as initially set. =20 =20 I have been doing a lot of re-tuning of the mixture which may account = for some of the dark deposits, but I'm considering a change of plugs soon. = Just wondered what other recommendations might be out there regarding plugs, = heat range, gaps. Lynn; I recall you weighed in on this before, but I didn't find it in the archives. =20 Thanks, =20 Al ------=_NextPart_000_0001_01C6F369.9C4B3D10 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I’m using NKG B9EGV plugs in my 20B, based on = Paul Yaw’s recommendation, with apparently good = performance. They now have 20-25 hours since installed through all the dyno = runs, engine tuning and some flying. I took them out for a look and they = have a bit more deposits than I expected, and some areas nearly black. = The electrodes still look OK, and the gaps are still close to .025 as = initially set.

I have been doing a lot of re-tuning of the mixture = which may account for some of the dark deposits, but I’m considering a = change of plugs soon. Just wondered what other recommendations might be = out there regarding plugs, heat range, gaps. Lynn; I recall you = weighed in on this before, but I didn’t find it in the = archives.

Thanks,

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