X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.143.101] (HELO imo-m13.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTP id 2812776 for flyrotary@lancaironline.net; Sat, 22 Mar 2008 00:53:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.143.101; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m13.mx.aol.com (mail_out_v38_r9.3.) id q.d6a.210ed1ad (30740) for ; Sat, 22 Mar 2008 00:52:59 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Sat, 22 Mar 2008 00:52:59 EDT Subject: Re: [FlyRotary] Re: Gravity fed carb? peer review To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1206161579" X-Mailer: Unknown sub 36 X-Spam-Flag: NO -------------------------------1206161579 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I like the idea of a real aircraft carb on the engine. These engines (12As) came here with 115 HP in the RX-2 and RX-3 in the early 70s. They had two stage 4 barrel carbs with tuned runners and pretty fair mixture control. For emissions reasons the exhaust was abysmal and cost about 15 HP.. So the first Hop up trick was the exhaust headers. With no runner length you are killing off half of the power. The idea is OK. But I would add about 10" runners out to the box manifold. Put a trumpet bell shape on the runners at the junction with the manifold. I would also run the supply hose to the center of the manifold and add a bit of a horn shape. there as well. The engine breaths front back front back. The end runners can be angled in a bit and the manifold perhaps could be half the length you have it now. A thin stainless shield on the bottom to ward off the huge amount of heat from the headers. Plan for 200 PSI to account for the occasional back fire. Lynn E. Hanover In a message dated 3/22/2008 12:25:51 A.M. Eastern Daylight Time, echristley@nc.rr.com writes: Michael Silvius wrote: > Any one see any obvious problems with such a set up? > **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom00030000000001) -------------------------------1206161579 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I like the idea of a real aircraft carb on the engine. These engines (1= 2As)=20 came here with 115 HP in the RX-2 and RX-3 in the early 70s. They had two st= age=20 4 barrel carbs with tuned runners and pretty fair mixture control.

For emissions reasons the exhaust was abysmal and cost about 15 HP.. So= the=20 first Hop up trick was the exhaust headers. With no runner length you are=20 killing off half of the power. The idea is OK. But I would add about 10" run= ners=20 out to the box manifold. Put a trumpet bell shape on the runners at the junc= tion=20 with the manifold. I would also run the supply hose to the center of the=20 manifold and add a bit of a horn shape. there as well. The engine breaths fr= ont=20 back front back. The end runners can be angled in a bit and the manifold per= haps=20 could be half the length you have it now. A thin stainless shield on the bot= tom=20 to ward off the huge amount of heat from the headers. Plan for 200 PSI to=20 account for the occasional back fire.

Lynn E. Hanover

In a message dated 3/22/2008 12:25:51 A.M. Eastern Daylight Time,=20 echristley@nc.rr.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Michael=20 Silvius wrote:
> Any one see any obvious problems with such a set=20 up?
>

<= DIV>

Create a Home Theater Like the Pros. Watch the video=20= on AOL Home. -------------------------------1206161579--