X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4905167 for flyrotary@lancaironline.net; Sun, 13 Mar 2011 19:48:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=Lehanover@aol.com Received: from imo-da02.mx.aol.com (imo-da02.mx.aol.com [205.188.169.200]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id p2DNm0RX004953 for ; Sun, 13 Mar 2011 19:48:00 -0400 Received: from Lehanover@aol.com by imo-da02.mx.aol.com (mail_out_v42.9.) id q.f38.fc46df6 (56027) for ; Sun, 13 Mar 2011 19:47:57 -0400 (EDT) Received: from magic-m26.mail.aol.com (magic-m26.mail.aol.com [172.20.22.199]) by cia-md08.mx.aol.com (v129.9) with ESMTP id MAILCIAMD081-dadb4d7d57a9b2; Sun, 13 Mar 2011 19:47:53 -0400 From: Lehanover@aol.com Message-ID: <193ad.348e1235.3aaeb1a9@aol.com> Date: Sun, 13 Mar 2011 19:47:53 EDT Subject: Re: [FlyRotary] Cracking exhaust manifolds/ Crankcase ventilation To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_193ad.348e1235.3aaeb1a9_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5382 X-AOL-IP: 72.187.199.116 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_193ad.348e1235.3aaeb1a9_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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 --part1_193ad.348e1235.3aaeb1a9_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time,=20 fluffysheap@gmail.com writes:

On=20 my home spun exhaust for my 3-rotor, I tighten the exhaust studs for the= =20 center rotor, but only snug down the bolts for #1 and #3 in order to all= ow the=20 exhaust manifold to grow and shrink as necessary. With 1600-1700*= EGT's,=20 it seems obvious that the manifold will grow more than the engine and if= not=20 allowed to move, it will crack. By torquing them only enough to pr= event=20 leakage, they are allowed to grow as needed, preventing cracks. So= far,=20 no broken studs or cracked exhaust manifold on my 3-rotor. =20

Mark S.

Bingo.

How about you torque up the center most stud to auto spec, then use= 2 bevel=20 washers flange to flange pulled down just short of flat on all other=20 studs.

Then use a short stack of bevel washers above and below a flange on= the=20 turbo setup to a strut to support the weight and keep the strain off of th= e=20 manifold.

Lynn E. Hanover

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