X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m17.mx.aol.com ([64.12.138.207] verified) by logan.com (CommuniGate Pro SMTP 5.0.7) with ESMTP id 967234 for flyrotary@lancaironline.net; Sat, 04 Feb 2006 09:01:06 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.207; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m17.mx.aol.com (mail_out_v38_r6.3.) id q.f4.61713fa0 (24895) for ; Sat, 4 Feb 2006 09:00:06 -0500 (EST) From: Lehanover@aol.com Message-ID: Date: Sat, 4 Feb 2006 09:00:06 EST Subject: Re: [FlyRotary] Mazda mufflers To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1139061606" X-Mailer: 9.0 SE for Windows sub 5022 X-Spam-Flag: NO -------------------------------1139061606 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/4/2006 8:08:49 AM Eastern Standard Time, rx7ez@yahoo.com writes: I have a "Welders Blanket" cloth which is supposed to handle over 2300 degF. I am hoping that I could use that for "glass packing". The "almost empty can" demonstrated at Tracy Crooks Rotary Roundup sounded good enough for my needs. George Graham Mazda Rx7ez N4449E Sarasota Florida -SRQ The problem with fillers, or packing if you like is twofold. The usual glass like material used in piston engine mufflers, just melts. If you catch it quickly, you may get to see the glass balls before they are machined away and vanish. If you try a ceramic blanket material like I did, you discover that the hammering of the exhaust pulses mechanically decomposes that material, or any material into fuzz and blows it out. The race car muffler has small tubes with thousands of small perforations. A 4" perforated tube down through the center, with 5 additional smaller perf tubes inside of that tube. Still under 100 dB at 50 feet after 7 years of service. It looks like the Burns mufflers but is very much larger and is about 27 pounds. The Burns mufflers look like the way to go to me. They offer stainless swarf packings which might hold up for quite a while. Years ago, there were mufflers (very big and heavy) used in Mazda race cars that had Lava Rock fillings. There was a bung with a screw in plug so you could refill the lava rock after each race. The Mazda just turns it into dust with the hammering. Lynn E. Hanover -------------------------------1139061606 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/4/2006 8:08:49 AM Eastern Standard Time,=20 rx7ez@yahoo.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I have a=20 "Welders Blanket" cloth which is supposed to handle over 2300 degF.
I a= m=20 hoping that I could use that for "glass packing".

The "almost empty= =20 can" demonstrated at Tracy Crooks Rotary Roundup sounded
good enough fo= r my=20 needs.

George Graham
Mazda Rx7ez N4449E
Sarasota=20 Florida -SRQ

The problem with fillers, or packing if you like is twofold. The usual=20 glass like material used in piston engine mufflers, just melts. If you catch= it=20 quickly, you may get to see the glass balls before they are machined away an= d=20 vanish.

If you try a ceramic blanket material like I did, you discover that the= =20 hammering of the exhaust pulses mechanically decomposes that material, or an= y=20 material into fuzz and blows it out.

The race car muffler has small tubes with thousands of small perforatio= ns.=20 A 4" perforated tube down through the center, with 5 additional smaller= =20 perf tubes inside of that tube. Still under 100 dB at 50 feet after 7 years=20= of=20 service. It looks like the Burns mufflers but is very much larger and is abo= ut=20 27 pounds. The Burns mufflers look like the way to go to me. They offer=20 stainless swarf packings which might hold up for quite a while.

Years ago, there were mufflers (very big and heavy) used in Mazda race=20= cars=20 that had Lava Rock fillings. There was a bung with a screw in plug so you co= uld=20 refill the lava rock after each race. The Mazda just turns it into dust with= the=20 hammering.

Lynn E. Hanover

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