X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 May 2012 09:59:28 -0400 Message-ID: X-Original-Return-Path: Received: from nm29-vm2.bullet.mail.ne1.yahoo.com ([98.138.91.129] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with SMTP id 5559346 for lml@lancaironline.net; Fri, 25 May 2012 06:47:41 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.91.129; envelope-from=casey.gary@yahoo.com Received: from [98.138.90.54] by nm29.bullet.mail.ne1.yahoo.com with NNFMP; 25 May 2012 10:47:05 -0000 Received: from [98.138.226.169] by tm7.bullet.mail.ne1.yahoo.com with NNFMP; 25 May 2012 10:47:05 -0000 Received: from [127.0.0.1] by omp1070.mail.ne1.yahoo.com with NNFMP; 25 May 2012 10:47:05 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 674042.90648.bm@omp1070.mail.ne1.yahoo.com Received: (qmail 21539 invoked by uid 60001); 25 May 2012 10:47:05 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=NuOWrFGXaf8GMZgUClYG9vBVCSKZtrcx2TyqZTEsxQUxBmpWr9OgiXGajMxZ9k9Vd3oQbF/MOT+YXykpKTkZgOg6YErRMm347r7Uy47ZB8bSCfmpm/lLOpwxNZf3gHQrlvjEB+aoye0XZpSzCDmVL3Rrz8cofhRs9X/OvZaZdMo=; X-YMail-OSG: FgQCTzsVM1lLljCS7hIQDGiB2GrryYT_oRt3ddwJtFIhOf4 zqksRf_7NOnAYaq_IQrTEB7df4CGlDPP14Le0gAzn5UDYIsQgx_LAeONuKWh wC7BqZMQy9n5zdEjM2togT6QC.4ZpAC26m6AjCtz5hKWGwg2zM31jAiTNYeP Y4uRKz6cLgZ4odI3kKYedTLywQmhc3P2X7PIh0hjNpjG_.4LxUz8iDlqptAC gI2y4UCz_sntNJVEBVbSVzILiAjasHH1YNCsS3kTTYlez2JSXpFJVy0xp6ki YetH.CpZxUs3Juzxv6cUAP._KDYH1SvfhcbATz1kXgvvg4dEswN1rDIbcpSo Fw7ePI9e1DNTlhewggaJDW2rImHIchiG4HEHh_iuTLNWGa36KEtEtJVPs0kd 2iJRW61vGZd7yYAUA__mvMtAbMv83IlYexcr70WN07kA6DFgBHqoIym3Jyg- - Received: from [71.208.88.80] by web125606.mail.ne1.yahoo.com via HTTP; Fri, 25 May 2012 03:47:05 PDT X-Mailer: YahooMailWebService/0.8.118.349524 References: X-Original-Message-ID: <1337942825.75562.YahooMailNeo@web125606.mail.ne1.yahoo.com> X-Original-Date: Fri, 25 May 2012 03:47:05 -0700 (PDT) From: Gary Casey Reply-To: Gary Casey Subject: Re: 360 still surging X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="607277540-1754508917-1337942825=:75562" --607277540-1754508917-1337942825=:75562 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Berni,=0AYes, it does make sense, but I've forgotten whether or not you hav= e used the electric pump in the original condition and whether or not it he= lped. =A0Regardless, cooling the engine-mounted pump is always a good idea.= =A0I have a box around the gascolator, mounted at the very bottem center o= f the firewall, which is fed air from a small scoop underneath. =A0The orig= inal tube normally used for an inlet is now an outlet that feeds cooling to= the engine-mounted fuel pump. =A0Works, as best I can tell. =A0As for the = check valve, I'm not sure.=0AGary=0A=0A=0AToday I made 2 changes to my airp= lane in an effort to remedy my surging issue. =A0Both changes were made as = per suggestions from LMLers. =A0=0A....My theory on why I experienced the s= tart issue was that the removal do[of] the check valve allows fuel to pass = back though the system unimpeded creating the possibility of a loss of prim= e at the engine driven fuel pump. =A0I believe that check valve (sniffle va= lve) needs to be in the fuel line. =A0Comments?=0A=0AChange #2 - I installe= d a blast tube and directed the airflow directly onto the engine mounted fu= el pump. =A0I started the engine (it was again cool from sitting idle for a= couple of hours) and went for flight #2. =A0Again the engine performed fla= wlessly. =A0I landed, taxied back to my hanger, shut down and let the airpl= ane sit for 20 minutes. =A0I restarted (again had to keep the aux fuel pump= on) and began to taxi but felt the surge right away but it was not as pron= ounced a before and seemed to be lessening. =A0During run up I let the engi= ne run a bit longer than usual at 1800 RPM. =A0When I went back ti idle...n= o surge. =A0I taxied to the active...no surge and took off. =A0Flew great, = landed and repeated the=A0=0AEt sit for 20 minute thing. =A0I restarted, ta= xied with a bit of a surge but was able to eliminate it during taxi and run= up.=0A=0AI am not ready to celebrate yet but I definitely see a marked red= uction in the severity of the surge and the ability, at least today, to eli= minate any surge by simply taxiing and or a bit of an extended run up. =A0I= believe the blast air is the reason for the improvement. =A0I believe I sh= ould also add a second blast tube with the air directed at the gascolator.= =0A=0ADoes this make sense? =A0Any and all comments welcome!=0A=0ABerni --607277540-1754508917-1337942825=:75562 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Berni,
Yes, it does make sense, but I've= forgotten whether or not you have used the electric pump in the original c= ondition and whether or not it helped.  Regardless, cooling the engine= -mounted pump is always a good idea.  I have a box around the gascolat= or, mounted at the very bottem center of the firewall, which is fed air fro= m a small scoop underneath.  The original tube normally used for an in= let is now an outlet that feeds cooling to the engine-mounted fuel pump. &n= bsp;Works, as best I can tell.  As for the check valve, I'm not sure.