X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp112.sbc.mail.mud.yahoo.com ([68.142.198.107] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with SMTP id 4338161 for flyrotary@lancaironline.net; Sun, 06 Jun 2010 10:31:30 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.107; envelope-from=ceengland@bellsouth.net Received: (qmail 58528 invoked from network); 6 Jun 2010 14:30:54 -0000 Received: from [192.168.10.7] (ceengland@98.95.179.240 with plain) by smtp112.sbc.mail.mud.yahoo.com with SMTP; 06 Jun 2010 07:30:54 -0700 PDT X-Yahoo-SMTP: uXJ_6LOswBCr8InijhYErvjWlJuRkoKPGNeiuu7PA.5wcGoy X-YMail-OSG: I7i7Gn0VM1km5kmXkdH5Y6Sv17asYILRE.N73xU39917MbIbOhHP19n9QEFrFhnOANT0v407dQL8vrjW3fxT3H6cM9AzWWXDHAMxj7XV8.pLWAckofBePm2Qq1Jiy1zrmoxjZ1yRdZLu_KvmrKGi4GLxKb8Fu.BsMFS1O6FHFmYaZ3QTY2mJOAJBo.a8hnvv6DpFYdqNXBqe4NbmB6t.6DAWiBIag.EXpGDPoREB5LxYA6GwMjcV0dxc.Bk_nEQLQigix6hSbXuJ_n1vRHKttNfrdbs1pynzqN8kDs7HfiWjaA-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <4C0BB11E.20008@bellsouth.net> Date: Sun, 06 Jun 2010 09:30:54 -0500 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: high/low pressure pumps question References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Reasonable question, but newer FI cars are putting the mechanical bypass-type regulator on the pump inside the gas tank, so I assume that any vapors get pushed through the injectors in short order. On 6/6/2010 9:04 AM, Kelly Troyer wrote: > Charlie, > Do you think there is a chance of any air bubbles (Say from an > empty tank) collecting > in the dead ended fuel rail and not clearing because the return line > is at the regulator ??...... > Kelly Troyer > "Dyke Delta"_13B ROTARY Engine > "RWS"_RD1C/EC2/EM2 > "Mistral"_Backplate/Oil Manifold > > > ------------------------------------------------------------------------ > *From:* Charlie England > *To:* Rotary motors in aircraft > *Sent:* Sun, June 6, 2010 8:47:24 AM > *Subject:* [FlyRotary] Re: high/low pressure pumps question > > Hope this helps... > > On 6/6/2010 2:21 AM, Todd Bartrim wrote: > > > > Hi Charlie; > > Hmmmnn, I gotta say a picture (or drawing) is worth a thousand words. > > Todd (sent on my new-fangled google phone with a really damn small > keyboard) > > > >> On 2010-06-05 8:46 PM, "Charlie England" >> wrote: > >> > >> Hi Todd, > >> > >> My thought is to set up the fuel path thus: fuel source through a T > into injection pumps, through filters, through combining T, through > the regulator(in cockpit), through firewall to engine. The regulator's > bypass port (in the cockpit) would be plumbed just like yours, except > no heat exchanger since the bypass fuel would never see the heat of > the engine compartment. The bypass would still T into the supply to > the injection pumps, like your system. Obviously, a manifold pressure > line would be required through the firewall into the cockpit to the > pressure regulator. > >> > >> My original plan (different injection that didn't require a return > line) was similar to your selector setup: main tanks feeding stock > van's selector, with the 3rd port on it being fed by a 2nd vans > selector to select either of the 2 aux tanks. No transfer pump would > have been required, & no crossover valve. Failure of the primary valve > could have been a 'show stopper', but the newer valves seem to be rock > solid reliable. Going to this system using the gear type pumps > requiring a return line forced re-thinking. Using your idea to return > the bypassed fuel at the pump inlet effectively eliminates the > 'return' issue, & tempts me to return to the original fuel selector > layout, with the addition of a Facet boost pump. The fact that the > optical sensors will work looking into the side of a fuel line (the > T), instead of needing them in the tank & that they still give almost > a full minute's warning, is very encouraging. I'll start looking for a > convenient place to mount them. > >> > >> I hope that Tracy will chime in on how he plumbed the regulator on > his -8. > >> > >> Many thanks for the extra details. > >> > >> Charlie > >> > >> > >> > >> On 6/5/2010 12:32 PM, Todd Bartrim wrote: > >> > >> > > >> > Hi Charlie > >> > Not sure I understand correctly what you mean? Can you > >> sketch it out quickly? I'... > >> > >> > *From*: Charlie England > >> > > >> >> .. > >> > >> > *Subject*: [FlyRotary] Re: high/low pressure pumps question > >> > *Date*: Sat, 05 Jun 2010 08:38:09 -0... > >> > >> > >> > >> -- > >> Homepage: http://www.flyrotary.com/ > >> Archive and UnSub: http://mail.lancaironline.net:81/lists... > >> >