X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1415055 for flyrotary@lancaironline.net; Fri, 22 Sep 2006 09:45:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-100-038.carolina.res.rr.com [24.74.100.38]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id k8MDhOTb013057 for ; Fri, 22 Sep 2006 09:43:26 -0400 (EDT) Message-ID: <000301c6de4d$3da242d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Pressure Regulator Vacuum or Boost?? Date: Fri, 22 Sep 2006 09:44:34 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 X-Virus-Scanned: Symantec AntiVirus Scan Engine I agree, Ernest, having flown over 325 hours with essentially no manifold-referenced pressure regulator, it is certainly not critical to have a manifold referenced one for the EC2. However, a number of folks sorting out their initial engine start up have found mediocre or poor low rpm idle - and if they are using a "boost" referenced regulator and assuming (as I did) that it also adjusts for "vacuum" levels in the manifold, this may contribute to the problem. You can compensate for this (to some extent) by adjusting the MAP values through programming - but, not completely. In my case, I just don't like taxing by all the Lycoming guys with an engine that sounds like it is not in perfect tune. ED > There may be other solutions, but given Ed's experience with nothing more > than a rough idle, I think staged injectors and the acceptance of a little > roughness at idle will let you use any pressure regulator you choose. > > -- > ,|"|"|, Ernest Christley | > ----===<{{(oQo)}}>===---- Dyke Delta Builder | > o| d |o http://ernest.isa-geek.org | > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >