X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.37.197.101] (HELO o1.xlccorp.com) by logan.com (CommuniGate Pro SMTP 5.0.7) with SMTP id 960007 for flyrotary@lancaironline.net; Sun, 29 Jan 2006 18:26:34 -0500 Received-SPF: none receiver=logan.com; client-ip=66.37.197.101; envelope-from=bbradburry@allvantage.com Received: (qmail 5333 invoked from network); 29 Jan 2006 23:19:09 -0000 Received: from dialup-4.235.39.13.dial1.orlando1.level3.net (HELO h2m6k0) (4.235.39.13) by o1.xlccorp.com with SMTP; 29 Jan 2006 23:19:08 -0000 Message-ID: <009d01c6252b$7d755220$411eeb04@h2m6k0> Reply-To: "Bill Bradburry" From: "Bill Bradburry" To: "Rotary motors in aircraft" References: Subject: SAG "SparkPlugs" Date: Sun, 29 Jan 2006 18:23:52 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Has anyone tried TCP? "Snip" The proper name of the stuff is Tri-Cresyl Phosphate (spelling questionable), a clear liquid, and you can get it from many FBO's. Aircraft Spruce carries it and the required dispenser kit (listed in the Fuel Additives section of their catalog). I usually buy it in quart (maybe liter - I haven't checked) cans. Each can has a built-in insert that is designed to interface with the dispenser syringe. Not being a chemist, or an expert on internal combustion processes, I can't talk about the actual in-cylinder mechanism - but here it is in layman terms as I understand it: TCP mixed with the leaded fuel in very small concentrations modifies the potential (metallic) lead deposits that are freed from the leaded fuel during combustion, to a form (a soft compound) that is readily blown out of a cylinder during the exhaust stroke. "Snip" Bill Bradburry