X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4195297 for flyrotary@lancaironline.net; Sun, 04 Apr 2010 17:14:10 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id D5BFE173741 for ; Mon, 5 Apr 2010 05:13:33 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 57CEABEC00E for ; Mon, 5 Apr 2010 05:13:32 +0800 (WST) Message-ID: <130D35A03E0540D1AB047D4164D34499@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Weber chokes Date: Mon, 5 Apr 2010 07:13:34 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100404-0, 04/04/2010), Outbound message X-Antivirus-Status: Clean Bill, What is the secondary for again? George (down under) > George, > You are correct but remember the manifold efficiency is based on having > the correct size runners to begin with. The venturi is needed to improve > vacuum to draw fuel. The Weber has a secondary venturi as well, the little > bullseye one in the middle. So things are complicated in any case. A well > tuned FI is almost always better. > Bill Jepson