X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from lincoln.lisco.com ([69.18.32.37] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4249678 for flyrotary@lancaironline.net; Thu, 06 May 2010 08:05:57 -0400 Received-SPF: none receiver=logan.com; client-ip=69.18.32.37; envelope-from=rob@mum.edu Received: from dell (76-76-232-54.lisco.net [76.76.232.54]) by lincoln.lisco.com (Postfix) with SMTP id 365302BF00 for ; Thu, 6 May 2010 07:05:20 -0500 (CDT) Message-ID: <5DAEBB5C2AA34C87864FAA2DC5DD4AB6@dell> Reply-To: "Rob" From: "Rob" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: fuel filters Date: Thu, 6 May 2010 07:05:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0055_01CAECEA.7AFB6A80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0055_01CAECEA.7AFB6A80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mike and everyone, I had the exact same thing happen with that same brand filter on my Ford = V6 in my BD4 installiation. I took me months to figure out that it was = the design of the filter that was causing the problem. The debris in the = cloged filter was so fine I could hardley even see it. The filters = screen was 5 or 10 microns. An expert car racer told me later that they = never use a filter that fine in raceing because even clean auto fuel = will clog it at high power settings. Robert Robert Bollinger MR722 MUM 1000 N.4th ST Fairfield, IA 52557 (641)919-3213 ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Wednesday, May 05, 2010 6:09 AM 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_0055_01CAECEA.7AFB6A80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mike and everyone,
I had the exact same thing happen with = that same=20 brand filter on my Ford V6 in my BD4 installiation. I took me months to = figure=20 out that it was the design of the filter that was causing the problem. = The=20 debris in the cloged filter was so fine I could hardley even see = it. The=20 filters screen was 5 or 10 microns. An expert car racer told me later = that they=20 never use a filter that fine in raceing because even clean auto fuel = will clog=20 it at high power settings.
Robert
 
Robert Bollinger
MR722 MUM
1000 = N.4th=20 ST
Fairfield, IA 52557
(641)919-3213
----- Original Message -----
From:=20 Tracy=20 Crook
Sent: Wednesday, May 05, 2010 = 6:09=20 AM
Subject: [FlyRotary] Re: fuel=20 filters

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

Yes, = this was=20 on 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=20 returned to normal and engine ran fine.  This would of course get = worse=20 and worse as the filter became more and more restrictive.  =

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

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,=20 for lack of a better answer I replaced my filters after my fuel = starvation=20 episode a while back. I still have no smoking gun that I can point = to as the=20 cause of 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 blocked filter and restricted fuel flow while = airborne....The=20 mixture creeps toward lean, the EGT creeps up, fuel pressure is = erratic=20 and moving lower . Tweak the mixture knob toward rich and = everything is=20 fine for 10 mins, then the cycle begins again. Big fuel filters = are=20 essential, especially for those with composite=20 tanks.
Regards,
John


--
Homepage:=20  http://www.flyrotary.com/
Archive and = UnSub:  =20 http://mail.lancaironline.net:81/lists/flyrotary/List.htm= l


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