X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from sccmmhc91.asp.att.net ([204.127.203.211] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1452234 for flyrotary@lancaironline.net; Mon, 09 Oct 2006 19:29:52 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.203.211; envelope-from=btilley@mchsi.com Received: from [192.168.1.104] (12-218-75-32.client.mchsi.com[12.218.75.32]) by sccmmhc91.asp.att.net (sccmmhc91) with SMTP id <20061009232926m9100ekqlie>; Mon, 9 Oct 2006 23:29:32 +0000 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-1--406745729 Message-Id: From: Bob Tilley Subject: Re: [FlyRotary] Exhaust Update Date: Mon, 9 Oct 2006 19:29:24 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.752.3) --Apple-Mail-1--406745729 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed Joe, This intake is designed for use on several engine, ie 4 port and 6 =20 port. So the mounting plate is a compromise for the different =20 engines. You will probably be able to gain some more rpm by =20 addressing the joint between the engine and manifold. Take a piece of =20= paper and trace you ports from the engine, cut out the openings on =20 the paper. Then lay the paper on the manifold over the openings and =20 you will see where it needs attention. Make a metal plate the same as =20= the paper tracing, cover the surface with something nonstick, then =20 bolt it on the manifold. Use JB Weld to form the manifold to a more =20 pleasing flow pattern. Remove the plate once hardened, and try on the =20= engine. I am sure you will see a big difference in RPM. Bob On Oct 9, 2006, at 12:40 PM, Joe Hull wrote: > Friends and others, > Oh, let me backup a minute. While the engine was down =96 waiting for =20= > the new exhaust I decided to re-do my intake manifold. I have the =20 > short Atkins manifold and had a plenum attached directly to the TWM =20= > throttle body =96 with nice sharp edges butting up to the throttle =20 > body (hey I didn=92t know!). So I created some 11=94 long intake tubes = =20 > that flare to a =93sort-of=94 bell mouth inside my air-cleaner plenum. = =20 > I tested that briefly with the old muffler and on the ground got =20 > another 100-150 RPM static and another 200-300 RPM in the air =96 up =20= > to 5400RPM and another 3-5kts airspeed (162kts). So that was a win. > > Regards, > > Joe Hull > > Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA) > > Redmond (Seattle), Washington --Apple-Mail-1--406745729 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 Joe,

This intake is designed for = use on several engine, ie 4 port and 6 port. So the mounting plate is a = compromise for the different engines. You will probably be able to gain = some more rpm by addressing the joint between the engine and manifold. = Take a piece of paper and trace you ports from the engine, cut out the = openings on the paper. Then lay the paper on the manifold over the = openings and you will see where it needs attention. Make a metal plate = the same as the paper tracing, cover the surface with something = nonstick, then bolt it on the manifold. Use JB Weld to form the manifold = to a more pleasing flow pattern. Remove the plate once hardened, and try = on the engine. I am sure you will see a big difference in = RPM.

Bob


On Oct 9, = 2006, at 12:40 PM, Joe Hull wrote:

=

Friends and = others,


Oh, let me backup a = minute. While the engine was down =96 waiting for the new exhaust I = decided to re-do my intake manifold. I have the short Atkins manifold = and had a plenum attached directly to the TWM throttle body =96 with = nice sharp edges butting up to the throttle body (hey I didn=92t know!). = So I created some 11=94 long intake tubes that flare to a =93sort-of=94 = bell mouth inside my air-cleaner plenum. I tested that briefly with the = old muffler and on the ground got another 100-150 RPM static and another = 200-300 RPM in the air =96 up to 5400RPM and another 3-5kts airspeed = (162kts). So that was a win.

Regards,

Joe Hull

Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA) =

Redmond = (Seattle), Washington

= --Apple-Mail-1--406745729--