X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4249332 for flyrotary@lancaironline.net; Wed, 05 May 2010 23:42:05 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao105.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100506034129.YGMK20564.fed1rmmtao105.cox.net@fed1rmimpo02.cox.net> for ; Wed, 5 May 2010 23:41:29 -0400 Received: from willsPC ([174.66.174.143]) by fed1rmimpo02.cox.net with bizsmtp id E3hU1e00L3600d2043hU8L; Wed, 05 May 2010 23:41:28 -0400 X-VR-Score: -160.00 X-Authority-Analysis: v=1.1 cv=RDGknaWEColYBAosNzHWAUqP/VR6Ab6kioi0WieaKDU= c=1 sm=1 a=+Wf/KPGOauV74ukzx3TzVw==:17 a=kviXuzpPAAAA:8 a=WrMfpB0aAAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=oLe8zgiEgxFWSLsCdygA:9 a=Id4ks6n1HkBFGAj31UAA:7 a=fWT2HqwX4w2Z_-Kyib2WnWfqNgQA:4 a=wPNLvfGTeEIA:10 a=Qa1je4BO31QA:10 a=4vB-4DCPJfMA:10 a=1Erk4P5SMDsA:10 a=UretUmmEAAAA:8 a=dsuQbPP78Mv5Nn5Vz4kA:9 a=_kfpCGBM3Jg4ckXjr1AA:7 a=29t4uJ2B2DFEUVzZlzIztlCAyeUA:4 a=iVkDmfvjeKcA:10 a=EzXvWhQp4_cA:10 a=+Wf/KPGOauV74ukzx3TzVw==:117 X-CM-Score: 0.00 Message-ID: From: "Mike Wills" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: fuel filters Date: Wed, 5 May 2010 20:41:29 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_007F_01CAEC93.56BE9A40" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 This is a multi-part message in MIME format. ------=_NextPart_000_007F_01CAEC93.56BE9A40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks for the reply. I asked about the 20B because presumably you need = about 50% more flow than I do with the 13B. Like I said, doubt this is related to the problem I had - sudden loss of = fuel pressure at cruise and at altitude where the flow requirements = presumably pretty low. At least compared to takeoff flow requirements. Mike Wills From: Tracy Crook=20 Sent: Wednesday, May 05, 2010 4:09 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: fuel filters A little more detail on symptoms that led you to change filters please? = Was this for the 20B? Yes, this was on the 20B but it would apply to any installation. = Symptoms were mixture going lean at higher throttle settings. This was = a slowly progressive thing, not a sudden occurrence. Cause was dropping = fuel pressure due to clogged filter. When throttled back, fuel pressure = returned to normal and engine ran fine. This would of course get worse = and worse as the filter became more and more restrictive. =20 I don't think this could happen suddenly unless you had a large amount = of foreign matter in the tank. It certainly can't cause the random = intermittent miss that Bill had which started this thread. =20 Tracy On Tue, May 4, 2010 at 10:54 PM, Mike Wills wrote: Tracy, A little more detail on symptoms that led you to change filters = please? Was this for the 20B? Although I'm not convinced that it was necessary, for lack of a better = answer I replaced my filters after my fuel starvation episode a while = back. I still have no smoking gun that I can point to as the cause of = this isolated incident. Keep waiting for the sudden unexplainable = re-occurrence. Hope when/if it happens I'm near something landable. Mike Wills From: Tracy Crook=20 Sent: Tuesday, May 04, 2010 9:58 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: fuel filters "Big fuel filters are essential, especially for those with composite = tanks." I second that. Just had to change out my nice looking Jegs Billet = aluminum filter (with a tiny screen disk filter inside) for Peterson 600 = series fuel filter. This is the filter between tank and fuel pump, not = the high pressure one after the pumps. Tracy On Tue, May 4, 2010 at 12:34 PM, John Slade = wrote: For what it's worth, I've seen the symptoms of a partially blocked = filter and restricted fuel flow while airborne....The mixture creeps = toward lean, the EGT creeps up, fuel pressure is erratic and moving = lower . Tweak the mixture knob toward rich and everything is fine for 10 = mins, then the cycle begins again. Big fuel filters are essential, = especially for those with composite tanks. Regards, John -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_007F_01CAEC93.56BE9A40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks for the reply. I asked about the 20B = because=20 presumably you need about 50% more flow than I do with the = 13B.
 
Like I said, doubt this is related to the = problem I had=20 - sudden loss of fuel pressure at cruise and at altitude where the flow=20 requirements presumably pretty low. At least compared to takeoff flow=20 requirements.
 
Mike Wills

Sent: Wednesday, May 05, 2010 4:09 AM
Subject: [FlyRotary] Re: fuel filters

A little more detail on symptoms = that led=20 you to change filters please? Was this for the 20B?

Yes, this = was on=20 the 20B but it would apply to any installation.    Symptoms = were=20 mixture going lean at higher throttle settings.  This was a slowly=20 progressive thing, not a sudden occurrence.  Cause was dropping = fuel=20 pressure due to clogged filter.  When throttled back, fuel pressure = returned to normal and engine ran fine.  This would of course get = worse and=20 worse as the filter became more and more restrictive. 

I = don't=20 think this could happen suddenly unless you had a large amount of = foreign matter=20 in the tank.  It certainly can't cause the random intermittent miss = that=20 Bill had which started this thread.  

Tracy

On Tue, May 4, 2010 at 10:54 PM, Mike Wills = <rv-4mike@cox.net>=20 wrote:
Tracy,
 
A little more detail on symptoms that led = you to=20 change filters please? Was this for the 20B?
 
Although I'm not convinced that it was = necessary, for=20 lack of a better answer I replaced my filters after my fuel starvation = episode=20 a while back. I still have no smoking gun that I can point to as the = cause of=20 this isolated incident. Keep waiting for the sudden unexplainable=20 re-occurrence. Hope when/if it happens I'm near something=20 landable.
 
Mike Wills

Sent: Tuesday, May 04, 2010 9:58 AM
Subject: [FlyRotary] Re: fuel filters

"Big fuel filters are essential, especially for = those with=20 composite tanks."

I second that.  Just had to change = out my=20 nice looking Jegs Billet aluminum filter (with a tiny screen disk = filter=20 inside) for Peterson 600 series fuel filter.   This is the = filter=20 between tank and fuel pump, not the high pressure one after the=20 pumps.

Tracy

On Tue, May 4, 2010 at 12:34 PM, John Slade = <jslade@canardaviation.com> wrote:
For what it's worth, I've seen the symptoms of a = partially=20 blocked filter and restricted fuel flow while airborne....The = mixture creeps=20 toward lean, the EGT creeps up, fuel pressure is erratic and moving = lower .=20 Tweak the mixture knob toward rich and everything is fine for 10 = mins, then=20 the cycle begins again. Big fuel filters are essential, especially = for those=20 with composite tanks.
Regards,
John


--
Homepage:  http://www.flyrotary.com/
Archive and UnSub: =   http://mail.lancaironline.net:81/lists/flyrotary/List.htm= l


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