X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 5.1.2) with ESMTP id 1582609 for flyrotary@lancaironline.net; Sun, 19 Nov 2006 13:45:22 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.36; envelope-from=dale.r@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao03.cox.net (InterMail vM.6.01.06.03 201-2131-130-104-20060516) with ESMTP id <20061119184458.OJGE4817.fed1rmmtao03.cox.net@fed1rmimpo02.cox.net> for ; Sun, 19 Nov 2006 13:44:58 -0500 Received: from [192.168.1.100] ([68.2.134.48]) by fed1rmimpo02.cox.net with bizsmtp id oil61V00512ovmC0000000; Sun, 19 Nov 2006 13:45:06 -0500 Message-ID: <4560A617.2090409@cox.net> Date: Sun, 19 Nov 2006 11:44:39 -0700 From: Dale Rogers Reply-To: dale.r@cox.net User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Spark Plugs References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Charlie England wrote:

Back in the bad old days when cars ran leaded gas & transistors were only found in spacecraft, there was an after market plug with construction known as 'surface gap'. The porcelain filled the area between the electrode & thread body. The 'gap' was the distance from the electrode to the thread body.

Anyone know whether these plugs are still available? It would seem that if nothing else, it might make cleaning the lead a bit easier.

Charlie

J.C.Whitney used to be a source of such a plug. All I can find there now is their "E3" plug, which appears to be merely a "standard" plug with three electrodes instead of just one. Then too, I didn't find any listing at all for the RX-n engines. Dale R.