X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 19 Aug 2010 08:41:15 -0400 Message-ID: X-Original-Return-Path: Received: from nskntmtas05p.mx.bigpond.com ([61.9.168.149] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4436570 for lml@lancaironline.net; Thu, 19 Aug 2010 07:19:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=61.9.168.149; envelope-from=frederickmoreno@bigpond.com Received: from nskntotgx01p.mx.bigpond.com ([124.182.130.99]) by nskntmtas05p.mx.bigpond.com with ESMTP id <20100819111920.CYLR18865.nskntmtas05p.mx.bigpond.com@nskntotgx01p.mx.bigpond.com> for ; Thu, 19 Aug 2010 11:19:20 +0000 Received: from Razzle ([124.182.130.99]) by nskntotgx01p.mx.bigpond.com with ESMTP id <20100819111917.KTZG25056.nskntotgx01p.mx.bigpond.com@Razzle> for ; Thu, 19 Aug 2010 11:19:17 +0000 From: "Frederick Moreno" X-Original-To: "'Lancair Mailing List'" Subject: FW: Tygon tubing discoloration X-Original-Date: Thu, 19 Aug 2010 19:19:02 +0800 X-Original-Message-ID: <004a01cb3f90$56676bd0$03364370$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004B_01CB3FD3.648AABD0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acs++Sw6VRqTH33tSfSu25f4R/NOawAloARw Content-Language: en-au X-RPD-ScanID: Class unknown; VirusThreatLevel unknown, RefID str=0001.0A090207.4C6D1338.0002,ss=1,fgs=0 X-SIH-MSG-ID: qho0Fdf+TFa2kTAvmTy2alorgFm6/gF5uMhSBI0wt0lHEVbCu8XAQsKhbaJCwZDv3S4obl+VTyR3c63tTY7QuNi5K75RSrLZ5vg2 This is a multi-part message in MIME format. ------=_NextPart_000_004B_01CB3FD3.648AABD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 Has anyone ever seen this before? Is it serious? =20 I noticed that the Adel clamps I used to secure spark plug lines put a discoloration on the spark plug lines where the clamps were mounted = above the cylinders, that is, where they get hot after shutdown. I suspect = the rubber in Adel clamps has some kind of outgassing characteristic that = stains nearby elastomers which soak up something oozing out of the rubber clamp lining. Just a guess. Interestingly, where the spark plug wire passed inside the clamp =96 no discoloration. Next to the clamp, where the = wire enters and leaves, the red spark plug wire is stained black for about = =BD inch, tapering off with distance. =20 =20 It had me scratching my head for a while until I realized that the particular clamps in question got the post-flight heat soak from the = fins on the cylinder head below. It does not seem to bother the spark plug = wiring. As for Tygon, I cannot say.=20 =20 Fred Moreno ------=_NextPart_000_004B_01CB3FD3.648AABD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Has = anyone ever seen this before? Is it serious?

I noticed that the Adel clamps I used to secure spark plug lines put a discoloration on the spark plug lines where the clamps were mounted = above the cylinders, that is, where they get hot after shutdown.=A0 I suspect the = rubber in Adel clamps has some kind of outgassing characteristic that stains = nearby elastomers which soak up something oozing out of the rubber clamp = lining.=A0=A0 Just a guess.=A0 Interestingly, where the spark plug wire passed=A0 = inside the clamp – no discoloration.=A0 Next to the clamp, where the wire = enters and leaves, the red spark plug wire is stained black for about =BD inch, = tapering off with distance.=A0

It had me scratching my head for a while until I realized that the = particular clamps in question got the post-flight heat soak from the fins on the = cylinder head below. =A0It does not seem to bother the spark plug wiring.=A0 As for = Tygon, I cannot=A0 say.

Fred Moreno

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