X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 13 Mar 2014 12:54:54 -0400 Message-ID: X-Original-Return-Path: Received: from nm28.bullet.mail.bf1.yahoo.com ([98.139.212.187] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6772745 for lml@lancaironline.net; Thu, 13 Mar 2014 11:23:08 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.212.187; envelope-from=chris_zavatson@yahoo.com Received: from [66.196.81.173] by nm28.bullet.mail.bf1.yahoo.com with NNFMP; 13 Mar 2014 15:22:33 -0000 Received: from [98.139.212.249] by tm19.bullet.mail.bf1.yahoo.com with NNFMP; 13 Mar 2014 15:22:33 -0000 Received: from [127.0.0.1] by omp1058.mail.bf1.yahoo.com with NNFMP; 13 Mar 2014 15:22:33 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 473349.60268.bm@omp1058.mail.bf1.yahoo.com Received: (qmail 20411 invoked by uid 60001); 13 Mar 2014 15:22:33 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=uAeTJQhHcExsvwIaGPkX8SgH6PUXjP+cfnIhyyg5jQToamzMuT1N46atBbs5C4ICaHGOINv4H3mqWBptVT+UXs2uQiUP47ErKCkQy01uc4AUuNrB2PIlG8S+9OtVU6j712fav1Mzh0/mEUETdzlgUFKwCGtlArtRVHht5uyW3o8=; X-YMail-OSG: YTpp1Q0VM1kFcQ4Fyl49WvARVq2awpT.QUm6e04zklsmJyb BGlAEUHa_FyzqpFmY_LJUaV_NkMTnBj9GukGKr10GXAk4yJh9.7uXfFQ.AJN w4lgx4fxZQ3dtEdfdIVNmaSJuFHLeDTvhYwi7ktArWyQYOPFNehmGBrKRFS9 96qao6nmwov4HYsTrz35_PfIt0D6z.0ef4au0EdxGpUSKJCd0UcHRMebsTI5 sxZXLDmRGCFVWwKQQpJmhOxeM3vlHZAQYfRru8DkrD0vmpBy75Bbh5TlwXVA EDSPn37acnxv2t_uV_9GGjq43fEzFei0fZL9E6VqQCQJXWX51TMegk9rG15n B2kQkQhJTyzM1VT1zXUCoMVrDxVkaZt1HZhpDZwbBjZW2Uc3oVZ_NS0fUWz_ Ss_5irv4pgAxZh5eh1G.eipFbNw9MVWJbGMALZBGrduovaZLQAG4DqRZSQ60 LIBmD1xHUV.kv77tXcyVhtuFv5dzRtN0QRi7qbckwDo25ryWimK3XHo7s1uK gSBRbwH1Pyu_ycKD1gw_0xmNeANGcnzAV2h3DvwOwOJZJIzBh43HkhM9lQCa igCEkOcQcMLtIZCkuiVQE3dBaJFANq.cb37aoTWv52l6rDsl7_M1Ki77YjkG 7Z9_DJowGYjK5AG7ComAU7qFLSOmnqsdIO4OAFUfikqhBM7YCEx8- Received: from [172.14.16.72] by web161203.mail.bf1.yahoo.com via HTTP; Thu, 13 Mar 2014 08:22:33 PDT X-Rocket-MIMEInfo: 002.001,VG9tLMKgCkdvb2QgUG9pbnQuwqAgSSBmb3Jnb3QgdG8gbWVudGlvbiBwaXBlIGV4cGFuc2lvbi4gwqBJIGZpZ3VyZWQgb24gc2VlaW5nIGFib3V0IDEvOCIgb2YgZ3Jvd3RoIGluIGxlbmd0aCBiYXNlZCBvbiBwaXBlIGxlbmd0aCwgQ1RFIGFuZMKgYSB0ZW1wZXJhdHVyZcKgZGVsdGEgSSBhc3N1bWVkIHdheSBiYWNrIHdoZW4uIMKgTXkgaGFuZ2VyIGZvcm1zIGEgdHJpYW5nbGUgaW4gYSBzaW5nbGUgcGxhbmUuwqDCoFR3byBjb3JuZXJzIGFyZSBhdHRhY2hlZCB0byB0aGUgZW5naW5lIGNhc2UgYW5kIHRoZSABMAEBAQE- X-Mailer: YahooMailWebService/0.8.178.641 References: <990A51AA-87B9-4A0A-A09C-22F12CF3EA82@yahoo.com> X-Original-Message-ID: <1394724153.92361.YahooMailNeo@web161203.mail.bf1.yahoo.com> X-Original-Date: Thu, 13 Mar 2014 08:22:33 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: Exhaust failure... X-Original-To: Lancair Mailing List In-Reply-To: <990A51AA-87B9-4A0A-A09C-22F12CF3EA82@yahoo.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-852950040-471772123-1394724153=:92361" ---852950040-471772123-1394724153=:92361 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Tom,=A0=0AGood Point.=A0 I forgot to mention pipe expansion. =A0I figured o= n seeing about 1/8" of growth in length based on pipe length, CTE and=A0a t= emperature=A0delta I assumed way back when. =A0My hanger forms a triangle i= n a single plane.=A0=A0Two corners are attached to the engine case and the = third at the pipes.=A0=A0This geometry=A0is very rigid in the vertical and = lateral axes to restrain movement caused by engine operation, but allows fo= r growth in pipe length. =A0The two legs are thin walled 4130 tubing with f= orks pressed into each end.=A0=A0Bent tabs form the connection at each end.= =0A=0AChris Zavatson=0AN91CZ=0A360std=0Ahttp://www.n91cz.net/=0A=0ASent fr= om my spiffy iPhone=0A=0AOn Mar 13, 2014, at 4:49 AM, dudewanarace@yahoo.co= m wrote:=0A=0A=0AI built an exhuast hanger like Chris speaks about. =A0I wa= nted a rigid mount that moved with the engine.=0A>=0A>=0A>Here is the mock = up:=0A>http://www.n54sg.com/images/exhaust/hanger_01.jpg=0A>=0A>=0A>=0A>And= then the final welded part.=0A>http://www.n54sg.com/images/exhaust/hanger_= 02.jpg=0A>=0A>=0A>=0A>Moral of the story, I'm not a welder and shouldn't pr= etend to be one. =A0It cracked at my weld, casting doubt on the idea. =A0Bu= t, after I had both of them re-welded by someone who knows what they are do= ing, all has been good since then.=0A>=0A>=0A>I have moved the weak link to= the clamp around the pipe. =A0Something one of the Unlimited racers remind= ed me of is that the pipes grow in length, so there needs to be a way to ac= count for that. =A0So far, what I have done is just not clamp them so tight= allowing the clamp to pivot forward and aft. =A0Worked so far!=0A>=0A>=0A>= Tom McNerney=0A>http://www.n54sg.com/=A0 ---852950040-471772123-1394724153=:92361 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Tom, 
Good Point.  I forgot to mention p= ipe expansion.  I figured on seeing about 1/8" of growth in length bas= ed on pipe length, CTE and a temperature delta I assumed way back= when.  My hanger forms a triangle in a single plane.  Two corners are attached to the en= gine case and the third at the pipes.  This geometry is very rigid in the vertical and la= teral axes to restrain movement caused by engine operation, but allows for = growth in pipe length.  The two legs are thin walled 4130 tubing with = forks pressed into each end.  Bent tabs form the connection at ea= ch end.

Chris Zavatson
N91CZ
360std

Sent from my spiffy iPhone

On Mar 13, = 2014, at 4:49 AM, dudewanarace@yahoo.com wrote:

I built an exhuast han= ger like Chris speaks about.  I wanted a rigid mount that moved with t= he engine.

Here is the mock up:

And then the final welded part.

Moral of the story, I'm not a welder and shouldn't pretend t= o be one.  It cracked at my weld, casting doubt on the idea.  But= , after I had both of them re-welded by someone who knows what they are doi= ng, all has been good since then.

I have moved the weak link to the clamp around the pipe.  Some= thing one of the Unlimited racers reminded me of is that the pipes grow in = length, so there needs to be a way to account for that.  So far, what = I have done is just not clamp them so tight allowing the clamp to pivot forward and aft.  Worked so far!

Tom McNerney
=
---852950040-471772123-1394724153=:92361--