X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1008414 for flyrotary@lancaironline.net; Mon, 20 Jun 2005 22:08:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=ceengland@bellsouth.net Received: from ibm66aec.bellsouth.net ([209.215.61.149]) by imf23aec.mail.bellsouth.net with ESMTP id <20050621020803.HIXY8541.imf23aec.mail.bellsouth.net@ibm66aec.bellsouth.net> for ; Mon, 20 Jun 2005 22:08:03 -0400 Received: from [209.215.61.149] by ibm66aec.bellsouth.net with ESMTP id <20050621020800.BXVY5308.ibm66aec.bellsouth.net@[209.215.61.149]> for ; Mon, 20 Jun 2005 22:08:00 -0400 Message-ID: <42B77680.70306@bellsouth.net> Date: Mon, 20 Jun 2005 21:08:00 -0500 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Fuel Injector Position (was Re: References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit IIRC, Ed reported frost on the outside of the tubes when he had the injectors out at the throttle body. If there's frost on the outside... Jim Sower wrote: > > > Dale Rogers wrote: > >>Jim, >> >> I think you skimmed over an important qualification of >>Dave's comment: >> >> >> >>>>... The worry to me here is that with the >>>>TB at the other end of the runner,ie close to the port, >>>> >>>> >> >>which exactly fills this part of your analysis: Really? Are his injectors UPstream from the throttle body? That's what I said caused carb ice. I understood him to say that his injectors were near (but DOWNstream from) his throttle body. >> >>>.. I think carb ice is pretty much always associated with >>>fuel sprayed into a venturi, and the injectors in our application are >>>always downstream of the "venturi" formed by the partially open throttle. >>> >>> >> >>Dale R. >>(the world needs more Lerts ...) >> >> >> >>>From: Jim Sower >>>Date: 2005/06/20 Mon PM 09:18:54 EDT >>>To: "Rotary motors in aircraft" >>>Subject: [FlyRotary] Re: Fuel Injector Position (was Re: >>> Makingprogress on Chris n Dave's Velocity Engine) >>> >>>But wouldn't that be true of ANY injectors placed a significant distance >>>from the block? I think carb ice is pretty much always associated with >>>fuel sprayed into a venturi, and the injectors in our application are >>>always downstream of the "venturi" formed by the partially open throttle. >>>I wouldn't worry ... Jim S. >>> >>>david mccandless wrote: >>> >>> >>> >>>> On PL's recent PP dyno run, he stated that with the injectors >>>> placed near the entry of the runners, there was considerable >>>> evaporative cooling taking place and as the tubes were running >>>> very cold VE should be good. The worry to me here is that with the >>>> TB at the other end of the runner,ie close to the port, there is a >>>> real risk of ice build up on the throttle body butterfly. The old >>>> bugbear of carb ice is back. FWIW, Dave McC >>>> >>>> >>>> since the >>>> >>>> ----- Original Message ----- *From:* Jerry Hey >>>> >>>> based on Paul Lamar's current p port testing there is no >>>> problem with placing the injectors at the far end of the >>>> runners. This is also backed up by an article on the internet >>>> (How to Fabricate an Intake Manifold) The idle issue is not >>>> with injector location but rather with butterfly location. >>>>