X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mta31.charter.net ([216.33.127.82] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4906653 for flyrotary@lancaironline.net; Mon, 14 Mar 2011 20:11:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.82; envelope-from=cardmarc@charter.net Received: from imp09 ([10.20.200.9]) by mta31.charter.net (InterMail vM.7.09.02.04 201-2219-117-106-20090629) with ESMTP id <20110315001117.NOOJ12685.mta31.charter.net@imp09> for ; Mon, 14 Mar 2011 20:11:17 -0400 Received: from HomeDesktop ([97.94.193.28]) by imp09 with smtp.charter.net id KCBH1g0080dDVdd05CBHoC; Mon, 14 Mar 2011 20:11:17 -0400 X-Authority-Analysis: v=1.1 cv=oIv04XXdEYh2MbYuDfZqeaswiw9+RGe2txZblPR/Lr4= c=1 sm=1 a=DXmwuPqBGoYA:10 a=4sash9Gc6afUAQh1p1CCVg==:17 a=Ia-xEzejAAAA:8 a=3oc9M9_CAAAA:8 a=pGLkceISAAAA:8 a=VS721LCUZ2m007HZDGAA:9 a=UwUP3-xJsRxahk-8bRcA:7 a=3ZVrXmXK2DwBNEsheZ1h6bOqTDgA:4 a=CjuIK1q_8ugA:10 a=EzXvWhQp4_cA:10 a=U8Ie8EnqySEA:10 a=MSl-tDqOz04A:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=SZM_pTNtxRO6k_kDlcMA:9 a=JP137TLhzhVAqjdyrzcA:7 a=J2DwFHXWHXIlkdtOIWqbRaSxHT8A:4 a=4sash9Gc6afUAQh1p1CCVg==:117 From: "Marc Wiese" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Cracking exhaust manifolds/ Crankcase ventilation Date: Mon, 14 Mar 2011 19:11:17 -0500 Message-ID: <00dd01cbe2a5$81aab280$85001780$@charter.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00DE_01CBE27B.98D6F470" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQF4vi2MFuPPLMLylOUD6kIAa7GxzJTTzZ/g Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_00DE_01CBE27B.98D6F470 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Do you mean Belleville constant torque washer stacks? Like are used on some wood props? Marc From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Lehanover@aol.com Sent: Sunday, March 13, 2011 6:48 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Cracking exhaust manifolds/ Crankcase ventilation In a message dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time, fluffysheap@gmail.com writes: On my home spun exhaust for my 3-rotor, I tighten the exhaust studs for the center rotor, but only snug down the bolts for #1 and #3 in order to allow the exhaust manifold to grow and shrink as necessary. With 1600-1700* EGT's, it seems obvious that the manifold will grow more than the engine and if not allowed to move, it will crack. By torquing them only enough to prevent leakage, they are allowed to grow as needed, preventing cracks. So far, no broken studs or cracked exhaust manifold on my 3-rotor. Mark S. Bingo. How about you torque up the center most stud to auto spec, then use 2 bevel washers flange to flange pulled down just short of flat on all other studs. Then use a short stack of bevel washers above and below a flange on the turbo setup to a strut to support the weight and keep the strain off of the manifold. Lynn E. Hanover ------=_NextPart_000_00DE_01CBE27B.98D6F470 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Do you mean = Belleville constant torque washer stacks? Like are used on some wood = props?

Marc

 

From:= = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Lehanover@aol.com
Sent: Sunday, March 13, 2011 = 6:48 PM
To: Rotary motors in aircraft
Subject: = [FlyRotary] Re: Cracking exhaust manifolds/ Crankcase = ventilation

 

I= n a message dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time, fluffysheap@gmail.com = writes:

&= nbsp;On my home spun exhaust for my 3-rotor, I tighten the exhaust studs = for the center rotor, but only snug down the bolts for #1 and #3 in = order to allow the exhaust manifold to grow and shrink as necessary. =  With 1600-1700* EGT's, it seems obvious that the manifold will = grow more than the engine and if not allowed to move, it will crack. =  By torquing them only enough to prevent leakage, they are allowed = to grow as needed, preventing cracks.  So far, no broken studs or = cracked exhaust manifold on my 3-rotor.   =

<= o:p> 

M= ark S.

&= nbsp;

B= ingo.

&= nbsp;

H= ow about you torque up the center most stud to auto spec, then use 2 = bevel washers flange to flange pulled down just short of flat on all = other studs.

&= nbsp;

T= hen use a short stack of bevel washers above and below a flange on the = turbo setup to a strut to support the weight and keep the strain off of = the manifold.

&= nbsp;

L= ynn E. Hanover

&= nbsp;

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