X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1316036 for flyrotary@lancaironline.net; Tue, 25 Jul 2006 22:13:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.208; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d22.mx.aol.com (mail_out_v38_r7.5.) id q.562.2dbdf4c (29679) for ; Tue, 25 Jul 2006 22:12:24 -0400 (EDT) From: Lehanover@aol.com Message-ID: <562.2dbdf4c.31f82988@aol.com> Date: Tue, 25 Jul 2006 22:12:24 EDT Subject: Re: [FlyRotary] header diameter To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1153879944" X-Mailer: 9.0 Security Edition for Windows sub 5319 X-Spam-Flag: NO -------------------------------1153879944 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/25/2006 8:19:24 P.M. Eastern Daylight Time, jskmberki@alltel.net writes: What size pipe should be used for headers? I assume it will be 321 stainless. Wall size? Thanks for any help. Joe Berki Limo EZ Just a bit bigger ID than the exhaust liner exit hole. The rules of thumb are: (depends on your engine) 1 7/8" ID or 2" ID in .062" stainless or .125" wall mild steel. As large a radius as is possible on bends. Primary lengths in multiples of 10" to 12". Both primary tubes exactly the same length. A flex joint of some sort to allow for engine movement. Otherwise the whole system must be mounted rigid to the engine and properly supported. The lowest back pressure muffler possible. Do not wrap mild steel with insulating tape. The steel will decompose and blow out the outside of the bends (where it is thinnest). The engines are 4 strokes but tune like piston port 2 cycles. So, exhaust design makes a big power difference. Lynn E. Hanover -------------------------------1153879944 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 7/25/2006 8:19:24 P.M. Eastern Daylight Time,=20 jskmberki@alltel.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
What size pipe should be used for headers= ? =20 I assume it will be 321 stainless. Wall size?  Thanks for any=20 help.
 
Joe Berki
Limo EZ
<= /DIV>
Just a bit bigger ID than the exhaust liner exit hole. The rules of thu= mb=20 are: (depends on your engine) 1 7/8" ID or 2" ID in .062" stainless or .125"= =20 wall mild steel. As large a radius as is possible on bends. Primary lengths=20= in=20 multiples of 10" to 12". Both primary tubes exactly the same length. A flex=20 joint of some sort to allow for engine movement. Otherwise the whole system=20= must=20 be mounted rigid to the engine and properly supported. The lowest back press= ure=20 muffler possible.
 
Do not wrap mild steel with insulating tape. The steel will decompose a= nd=20 blow out the outside of the bends (where it is thinnest). 
 
The engines are 4 strokes but tune like piston port 2 cycles. So, exhau= st=20 design makes a big power difference.
 
Lynn E. Hanover
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