Return-Path: Received: from www.sequoianet.com (ns.sequoianet.com [206.242.77.3]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Thu, 4 Feb 1999 08:23:40 -0500 Received: from inet001.cardell.com (INET001.sequoianet.com [207.87.248.2]) by www.sequoianet.com (Post.Office MTA v3.1.2 release (PO205-101c) ID# 0-51638U1000L1000S0) with SMTP id AAA555 for ; Thu, 4 Feb 1999 08:30:41 -0500 Received: from ccMail by inet001.cardell.com (ccMail Link to SMTP R8.00.01) id AA918134984; Thu, 04 Feb 99 08:30:41 -0500 Message-Id: <9902049181.AA918134984@inet001.cardell.com> Date: Thu, 04 Feb 99 08:22:34 -0500 From: To: Subject: Re:360 exhaust flange attach X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I recently noticed that the flanges on the factory exhaust pipes are not flat when torqued up against the heads of my IO-360 (gaskets installed). The surface appears to bow away from the head between the studs. The flanges appear flat enough when removed from the head. I don't see daylight under the sealing surface of the gasket. . Have any of you seen this happen in your installations? I read that any exhaust blow-by will burn nearby components. Also, can anyone recommend a torque value for the exhaust flange nuts? I can't seem to locate one in either the Lycoming or Lancair manual. Much Appreciated, Ed de Chazal