X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2398149 for flyrotary@lancaironline.net; Sun, 21 Oct 2007 02:07:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m25.mx.aol.com (mail_out_v38_r9.3.) id q.c6b.1aab3d93 (48576) for ; Sun, 21 Oct 2007 02:07:19 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Sun, 21 Oct 2007 02:07:19 EDT Subject: Re: [FlyRotary] Re: BellMouth Article To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1192946839" X-Mailer: 9.0 Security Edition for Windows sub 5378 X-Spam-Flag: NO -------------------------------1192946839 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 10/20/2007 8:11:31 P.M. Eastern Daylight Time, rotary.thjakits@gmail.com writes: Although "radius" will get you most already, I found the "resonance"-fog interesting. All but the ellipse form will have a cloud of mixture outside the bellmouth. The Ellipse has only a very shallow cushion right on the bellmouth. Interesting if you fire your injectors directly into the bellmouth.... TJ If the horn is attached to a carburetor and the engine is at one of several RPM that generates the standing wave. It is common to see this on a dyno. And is more likely on piston engines, with the long time out between induction events. When the horns are inside a plenum, that alters the tune, and the fuel fog problem is moved to a different RPM, and may be less profound. In carbureted engines the plenum should be stout enough to withstand an explosion from a fuel air mixture that may be close to an ideal ratio. Notice that in street cars those things are thick walled castings and a bit heavy, even in injected engines. Lynn E. Hanover ************************************** See what's new at http://www.aol.com -------------------------------1192946839 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 10/20/2007 8:11:31 P.M. Eastern Daylight Time,=20 rotary.thjakits@gmail.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
Although "radius" will get you most already, I found the "resonance"-= fog=20 interesting.
All but the ellipse form will have a cloud of mixture outside the=20 bellmouth.
The Ellipse has only a very shallow cushion right on the bellmouth.
Interesting if you fire your injectors directly into the=20 bellmouth....
 
TJ
If the horn is attached to a carburetor and the engine is at one of sev= eral=20 RPM that generates the standing wave. It is common to see this on a dyno. An= d is=20 more likely on piston engines, with the long time out between induction=20 events. When the horns are inside a plenum, that alters the tune, and t= he=20 fuel fog problem is moved to a different RPM, and may be less profound. In=20 carbureted engines the plenum should be stout enough to withstand an=20 explosion from a fuel air mixture that may be close to an ideal ratio.
 
Notice that in street cars those things are thick walled castings and a= bit=20 heavy, even in injected engines.
 
Lynn E. Hanover 



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