X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 22 May 2012 09:32:25 -0400 Message-ID: X-Original-Return-Path: Received: from mail-wg0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5553025 for lml@lancaironline.net; Tue, 22 May 2012 07:28:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=grabiel71@gmail.com Received: by wgbds11 with SMTP id ds11so4402414wgb.7 for ; Tue, 22 May 2012 04:27:45 -0700 (PDT) MIME-Version: 1.0 Received: by 10.180.105.69 with SMTP id gk5mr34209108wib.3.1337686065457; Tue, 22 May 2012 04:27:45 -0700 (PDT) Received: by 10.216.182.10 with HTTP; Tue, 22 May 2012 04:27:45 -0700 (PDT) Received: by 10.216.182.10 with HTTP; Tue, 22 May 2012 04:27:45 -0700 (PDT) In-Reply-To: References: X-Original-Date: Tue, 22 May 2012 07:27:45 -0400 X-Original-Message-ID: Subject: Re: [LML] 360 still surging From: don Grabiel X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=f46d04426f14c0a9a404c09e4e23 --f46d04426f14c0a9a404c09e4e23 Content-Type: text/plain; charset=ISO-8859-1 Berni, just a thought, but do you have a fuel filter in between the gascolator and the manual fuel pump on the engine? If so try removing it. Don G. On May 21, 2012 4:31 PM, "Berni Breen" wrote: > Many of you guys have offered suggestions to help me remedy my ongoing > engine surge challenge. As a reminder...my fuel injected IO360 displays a > very pronounced surge during idle and taxi following a flight and brief > shutdown/restart. The problem never occurs when the engine iis cool. > > I have tried suggestions such as ground running the engine at 1700 rpm for > extended periods following a restart in an attempt to get some air moving > through the cowl but that has resulted in limited success. So far my only > remedy is to let the engine sit for a long enough period to let it cool > significantly. If I do, I have zero issues with surging. > > I even removed my fuel injector servo and sent it off for overhaul (not an > inexpensive undertaking) as another attempt to remedy my problem. That > idea does not address what I firmly believe to be the problem, heat causing > fuel vapor lock, but I tried it anyway. I reinstalled the servo yesterday > and test flew. The plane performed flawlessly as it always does following > a first start. When I returned home and let it sit for 20 minutes, > restarted and went to taxi, the surge was just as pronounced as ever. > > All of my fuel lines are insulated and fire sleeved. The only exposed > lines are the small lines that run up to the spider on the top of the > engine. I do not have any fuel leaks. Turning on my electric fuel pump, > while increasing fuel pressure from 20 to 25 psi, does not remedy the surge > issue. > > As posted here before I have taken the active and lifted off several times > with this surge issue going on as the surge quits once I apply full > throttle. As several of you have pointed out this is not a safe way to > proceed therefore I am again asking for ideas/suggestions from you guys. > > Many years ago in my drag racing days me and several of my friends would > install a cooling can to cool down the fuel and therefore (we believed) > helped us produce more power. We would use a coffee can, insert a coil of > copper fuel line in the can, put this contraption in line (fuel line) fill > it and fill it with ice prior to a run. While this is not a practical long > term solution, is this the kind of thing I should be doing to > prove/disprove my belief that I have a vapor lock issue? > > I sincerely appreciate any and all suggestions! > > Berni Breen > Lancair 360 > > > --f46d04426f14c0a9a404c09e4e23 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Berni, just a thought, but do you have a fuel filter in between the gasc= olator and the manual fuel pump on the engine? If so try removing it.=A0=A0= =A0=A0=A0 Don G.

On May 21, 2012 4:31 PM, "Berni Breen"= <bbreen@cableone.net> wro= te:
Many of you guys have offered suggestions to help me remedy my ongoing engi= ne surge challenge. =A0As a reminder...my fuel injected IO360 displays a ve= ry pronounced surge during idle and taxi following a flight and brief shutd= own/restart. =A0The problem never occurs when the engine iis cool. =A0

I have tried suggestions such as ground running the engine a= t 1700 rpm for extended periods following a restart in an attempt to get so= me air moving through the cowl but that has resulted in limited success. = =A0So far my only remedy is to let the engine sit for a long enough period = to let it cool significantly. =A0If I do, I=A0have zero issues with s= urging.

I even removed my fuel injector serv= o and sent it off for overhaul (not an inexpensive undertaking) as another = attempt to remedy my problem. =A0That idea does not address what I firmly b= elieve to be the problem, heat causing fuel vapor lock, but I tried it anyw= ay. =A0I reinstalled the servo yesterday and test flew. =A0The plane perfor= med flawlessly as it always does following a first start. =A0When I returne= d home and let it sit for 20 minutes, restarted and went to taxi, the surge= was just as pronounced as ever.

All of my fuel lines are insulated a= nd fire sleeved. =A0The only exposed lines are the small lines that run up = to the spider on the top of the engine. I do not have any fuel leaks. =A0Tu= rning on my electric fuel pump, while increasing fuel pressure from 20 to 2= 5 psi, does not remedy the surge issue.

As posted here before I have taken t= he active and lifted off several times with this surge issue going on as th= e surge quits once I apply full throttle. =A0As several of you have pointed= out this is not a safe way to proceed therefore I am again asking for idea= s/suggestions from you guys.

Many years ago in my drag racing day= s me and several of my friends would install a cooling can to cool down the= fuel and therefore (we believed) helped us produce more power. =A0We would= use a coffee can, insert a coil of copper fuel line in the can, put this c= ontraption in line (fuel line) fill it and fill it with ice prior to a run.= =A0While this is not a practical long term solution, is this the kind of t= hing I should be doing to prove/disprove my belief that I have a vapor lock= issue?

I sincerely appreciate any and all s= uggestions!

Berni Breen
Lancair 360


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