X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma06.mx.aol.com ([64.12.78.142] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5560956 for flyrotary@lancaironline.net; Fri, 25 May 2012 22:53:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.78.142; envelope-from=Lehanover@aol.com Received: from mtaomg-ma03.r1000.mx.aol.com (mtaomg-ma03.r1000.mx.aol.com [172.29.41.10]) by imr-ma06.mx.aol.com (8.14.1/8.14.1) with ESMTP id q4Q2r77M001410 for ; Fri, 25 May 2012 22:53:07 -0400 Received: from core-moc003b.r1000.mail.aol.com (core-moc003.r1000.mail.aol.com [172.29.195.10]) by mtaomg-ma03.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 9D24CE000086 for ; Fri, 25 May 2012 22:53:07 -0400 (EDT) From: Lehanover@aol.com Message-ID: <5abf.472a9bc8.3cf19f93@aol.com> Date: Fri, 25 May 2012 22:53:07 -0400 (EDT) Subject: Re: [FlyRotary] Re: 89 center housing To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_5abf.472a9bc8.3cf19f93_boundary" X-Mailer: AOL 9.6 sub 5004 X-Originating-IP: [173.88.30.23] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1338000787; bh=BoFsyX3tVOZEYq31AQahQ72/xIeY/KnOkyhKB6nXZWA=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=GApH2pIyTI4ApZ90pYsglHUYwwGj3XYBBt1t7eNZs/9c+3HA1hwwW1l34LFwTYU+e VhV+Eoii3CllPoxfqC36MvXdLi5WlVjVpEGDzVtHsM1yGqHyD4GDW/fAGrT7JamsxL 6FoismRyzHmtZaaQXAOY6ZZZPfPSO2RhSI4HedgU= X-AOL-SCOLL-SCORE: 0:2:450005408:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d290a4fc0459313fb --part1_5abf.472a9bc8.3cf19f93_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit On 12As that little opening leads to a vertical gallery down to a passage that is open in both directions to similar galleries in the rotor housings. That allows air from the air pump to enter the hollow bolts (two in each rotor housing) to blow air into the exhaust stream that assures complete burning of any excess fuel that might have escaped from the engine. These bolts pass through the stainless liners and stick up into the exhaust stream to no good help. In racing these hollow bolts are removed and replaced with solid aluminum bolts of same shape. (from Racing Beat). Or you can cut the stock bolts down to match the liner and TIG the ends shut. So, at least on early engines that passage does nothing for racing or airplane use, but those holes must be plugged otherwise there is a path from outside the engine to inside the engine. If there is no air pump on the year you have, the opening may be vestigial and go nowhere. After market manifolds just have a land area that covers the hole. So, you could plate over it. Or fill it with epoxy. It is common of Mazda and others to leave features on parts and pieces for years that are no longer used. Such as the shape and land area for the top mounted starter that most people have never even seen. The builder may have plugged those holes, or the holes may not exist in 13B stuff. Just look into the exhaust ports. Lynn E. Hanover In a message dated 5/25/2012 9:08:58 P.M. Eastern Daylight Time, keltro@gmail.com writes: Joe, Mark is correct...............Do not recall if it is for EGR (exhaust gas recirculation) or intake manifold heat...........Definitely needs to be blocked off and for our aircraft use ideally the opening in the exhaust insert could be welded shut or otherwise closed off..............IMHO...............Lynn what say you on this matter ??..................... Kelly Troyer --part1_5abf.472a9bc8.3cf19f93_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
On 12As that little opening leads to a vertical gallery down to a pass= age=20 that is open in both directions to similar galleries in the rotor housings.= That=20 allows air from the air pump to enter the hollow bolts (two in each rotor= =20 housing) to blow air into the exhaust stream that assures complete burning = of=20 any excess fuel that might have escaped
from the engine. These bolts pass through the stainless liners and sti= ck up=20 into the exhaust stream to no good help. In racing these hollow bolts are= =20 removed and replaced with solid aluminum bolts of same shape.
(from Racing Beat). Or you can cut the stock bolts down to match the l= iner=20 and TIG the ends shut. So, at least on early engines that passage does noth= ing=20 for racing or airplane use, but those holes must be plugged otherwise there= is a=20 path from outside the engine to inside the engine. If there is no air pump = on=20 the year you have, the opening may be vestigial and go nowhere. After marke= t=20 manifolds just have a land area that covers the hole. So, you could plate o= ver=20 it. Or fill it with epoxy.
 
It is common of Mazda and others to leave features on parts and pieces= for=20 years that are no longer used. Such as the shape and land area for the top= =20 mounted starter that most people have never even seen.
 
The builder may have plugged those holes, or the holes may not exist i= n 13B=20 stuff. Just look into the exhaust ports.
 
Lynn E. Hanover
 
 
In a message dated 5/25/2012 9:08:58 P.M. Eastern Daylight Time,=20 keltro@gmail.com writes:
=
Joe,
 Mark is correct...............Do not recall if it is for = EGR=20 (exhaust gas recirculation) or intake manifold heat...........Definitely = needs=20 to be blocked off and
for our aircraft use ideally the opening in the exhaust insert = =20 could be welded shut or otherwise closed=20 off..............IMHO...............Lynn what say
you on this matter
 ??.....................
 
Kelly Troyer
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