X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes57.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 617921 for flyrotary@lancaironline.net; Thu, 28 Jul 2005 14:31:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.220; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.3]) by priv-edtnes57.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with ESMTP id <20050728183057.OMKI1087.priv-edtnes57.telusplanet.net@boucher-oddle24> for ; Thu, 28 Jul 2005 12:30:57 -0600 MIME-Version: 1.0 Message-Id: <42E92459.000014.03408@BOUCHER-ODDLE24> Date: Thu, 28 Jul 2005 11:30:49 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_DROC36E1VA4000000000" X-Mailer: IncrediMail (4001930) From: "Echo Lake Fishing Resort (Georges Boucher)" References: To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: fuel filter question X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 --------------Boundary-00=_DROC36E1VA4000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed's opinion reflex mine.=0D Georges B. =0D =0D -------Original Message-------=0D =0D From: Ed Anderson=0D Date: 07/28/05 10:44:14=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: fuel filter question=0D =0D Kevin,=0D =0D I suspect you are correct about the design flaw. =0D =0D According to the data you provided - your fuel flow capacity with the two 1/8" holes and the 1/4" common passage is way below what I have with a standard 3/8" dia fuel line.=0D =0D Your two 1/8" parallel flow holes only provide a total of 0.024544 squa= re inches of flow area. The 1/4" common passage (tube??) only provides 0 049087 square inches. Whereas the standard 3/8" dia fuel line provides = 0 110447 sq inch of flow are.=0D =0D So if i understand your system, it appears to me it may limit flow to onl= y from 22 - 44 % of what the standard 3/8" line gives you. Could be I sim= ply did not understand your descriptions correctly - but that's the way it appears to me.=0D =0D If correct then that could explain why your system will not support full throttle. Also may account for the lower than expected pressure for a fa= cet pump - mine puts out 6 psi. =0D =0D So from your previous description of your troubles, I think you are able = to maintain 2200 rpm simply until your float bowl is sucked down to a steady state condition (that supportable by the rate of fuel flow through your simple - which appears to be restricted) then your engine rpm drops until= it reaches the rpm that the sustainable fuel flow supports and NO MORE.=0D =0D My 0.02 worth=0D =0D Ed A=0D ----- Original Message ----- =0D From: kevin lane =0D To: Rotary motors in aircraft =0D Sent: Thursday, July 28, 2005 12:43 PM=0D Subject: [FlyRotary] fuel filter question=0D =0D =0D I suspect that my engine problems stem from a design flaw, rather than a blockage. I normally never run my engine full power, full rich, but have been while breaking in the new rings. even leaning the engine a few notc= hes prevents my problem, so it never arose in the past. my auto fuel filters are on the "suck" side, between the tanks and the selector valve. they a= re small, glass see-thru mesh filters. I realize now that all the fuel pass= es thru a pair of like 1/8" holes from a common 1/4" passage. I also see th= at the facet pump, despite pumping 15+ gals / hr with no head pressure, will only produce 1.75 lbs pressure when attached to the carb and bypassing th= e manual pump.=0D my question - I was told not to use a fuel injection filter on a low pressure system like mine. I would like to keep the filters where they a= re rather than moving them to the engine compartment, since they filter stuf= f ahead of my flow meter and pumps. I like how they fit along the wing spa= r below my knees. I had problems with the replaceable filters shedding fib= ers into the carb, which is why I changed to the mesh filters. does anyone know what I should be using?=0D I plan to do more testing this weekend if my wife will let me drive h= er car("no, I'm not feeling sleepy :-)" to get to the airport.=0D Kevin Lane Portland, OR=0D e-mail-> n3773@comcast.net=0D =0D =0D =20 --------------Boundary-00=_DROC36E1VA4000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ed's opinion reflex mine.
Georges B. 
 
-------Original Message-------
 
Date: 07/28/05 10:= 44:14
Subject: [FlyRotar= y] Re: fuel filter question
 
Kevin,
 
I suspect you are correct about the design flaw.&= nbsp;
 
According to the data you provided - your fuel fl= ow capacity with the two 1/8" holes and the 1/4" common passage is way be= low what I have with a standard 3/8" dia fuel line.
 
Your two 1/8" parallel flow holes only provide a = total of   0.024544 square inches of flow area.  The 1/4" common passage (tube??) = only provides  0.049087 square inches.  Whereas the standard 3/8" dia fuel line = provides  0.110447 sq inch of flow are.
 
So if i understand your system, it appears to me = it may limit flow to only from 22 - 44 % of what the standard 3/8" line g= ives you.   Could be I simply did not understand your descripti= ons correctly - but that's the way it appears to me.
 
If correct then that could explain why your syste= m will not support full throttle.  Also may account for the lower th= an expected pressure for a facet pump - mine puts out 6 psi. 
 
So from your previous description of your trouble= s, I think you are able to maintain 2200 rpm simply until your float bowl= is sucked down to a steady state condition (that supportable by the rate= of fuel flow through your simple - which appears to be restricted) then = your engine rpm drops until it reaches the rpm that the sustainable fuel = flow supports and NO MORE.
 
My 0.02 worth
 
Ed A
----- Original Message -----
<= B>From: kevin lane
Sent: Thursday, July 28, 2005 12:4= 3 PM
Subject: [FlyRotary] fuel filter q= uestion

I suspect that my engine probl= ems stem from a design flaw, rather than a blockage.  I normally nev= er run my engine full power, full rich, but have been while breaking in t= he new rings.  even leaning the engine a few notches prevents my pro= blem, so it never arose in the past.  my auto fuel filters are on th= e "suck" side, between the tanks and the selector valve.  they are s= mall, glass see-thru mesh filters.  I realize now that all the fuel = passes thru a pair of like 1/8" holes from a common 1/4" passage.  I= also see that the facet pump, despite pumping 15+ gals / hr with no head= pressure, will only produce 1.75 lbs pressure when attached to the carb = and bypassing the manual pump.
    my question= - I was told not to use a fuel injection filter on a low pressure system= like mine.  I would like to keep the filters where they are rather = than moving them to the engine compartment, since they filter stuff ahead= of my flow meter and pumps.  I like how they fit along the wing spa= r below my knees.  I had problems with the replaceable filters shedd= ing fibers into the carb, which is why I changed to the mesh filters.&nbs= p;  does anyone know what I should be using?
    I plan to d= o more testing this weekend if my wife will let me drive her car("no, I'm= not feeling sleepy :-)" to get to the airport.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
 
 
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