X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp108.sbc.mail.re2.yahoo.com ([68.142.229.97] verified) by logan.com (CommuniGate Pro SMTP 5.2.8) with SMTP id 3183150 for flyrotary@lancaironline.net; Mon, 22 Sep 2008 22:15:34 -0400 Received: (qmail 6861 invoked from network); 23 Sep 2008 02:15:33 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=AwwGVVv3se7HRtjBhgekoQb/tyx59KkKScRX3cy4M5oa6V7PPf8AXF0b/JFy7RNrUF+aeot99Slv4jSpsDPgU4+NAaC2+uHq76gB3IGt+Ior9J3hpauS41XTUKPrrSSTG1vnKYy6ECGO83mRhiU7QPQ5Miy858zv2M4xBIH55zQ= ; Received: from unknown (HELO mom) (downing.j@sbcglobal.net@75.40.232.191 with login) by smtp108.sbc.mail.re2.yahoo.com with SMTP; 23 Sep 2008 02:15:33 -0000 X-YMail-OSG: V.wLSuMVM1l5ZNGGNqwO4V5W311.vK.yQfA48KnHyQou85p_wJTQtqW0lqRvU0vGU1o_NepolaL1qYKY6RHGCLE3FP7v0pYgmuLYsXRpj5SB1f05n2ojCeji3lOr3O88K_Yy8gVv4oOCzBZEdhtJTmk6jGPLcg-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <003a01c91d23$977296e0$4001a8c0@gateway.2wire.net> From: "John Downing" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Manifold vacuum gage Date: Mon, 22 Sep 2008 22:25:04 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0037_01C91D02.0FC9E700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0037_01C91D02.0FC9E700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al, that is a good thought on the fuel regulator, I had better get a = dampener added before I fly. My engine also has a very rough idle. = JohnD ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Monday, September 22, 2008 12:56 PM Subject: [FlyRotary] Manifold vacuum gage Mark, I was thinking along the lines of the restrictors in the vacuum = lines I seen in the pile of tubing from a couple old cars that I = scraped, or maybe a 1/8" piece of steel tubing with a drop of solder in = and a hole drilled thru the solder. The aquarium valve would sure be a = simple way to make a restrictor. JohnD John; That's essentially what I did, except I used epoxy instead of solder, = and used a .050 wire to form the orifice. Then used a fuel filter as an = accumulator. It improved the idle of the engine. =20 I had also found that using the un-damped MAP signal for the = pressure-referenced fuel pressure regulator caused rapid pulsations in = the fuel pressure. I don't know that this affected engine operation in = any way, but decided it could an unknown stressing factor on the fuel = system. Using the damped MAP signal eliminated that phenomenon. All of this is influenced by the location of the MAP measuring ports. = Mine is picked up relatively close to the ports (about 6") and would = likely have stronger pulse than if picked up in an air box at the far = end of long runners.=20 Al G. ------=_NextPart_000_0037_01C91D02.0FC9E700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Al, that is a good thought on the fuel = regulator, I=20 had better get a dampener added before I fly.  My engine also has a = very=20 rough idle.  JohnD
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Monday, September 22, = 2008 12:56=20 PM
Subject: [FlyRotary] Manifold = vacuum=20 gage

Mark, I was thinking = along the=20 lines of the restrictors in the vacuum lines I seen in the pile of = tubing from=20 a couple old cars that I scraped, or maybe a 1/8" piece of steel = tubing with a=20 drop of solder in and a hole drilled thru the solder.  The = aquarium valve=20 would sure be a simple way to make a restrictor.  = JohnD

 

John;

 

That=92s essentially = what I did,=20 except I used epoxy instead of solder, and used a .050 wire to form = the=20 orifice. Then used a fuel filter as an accumulator.  It improved = the idle=20 of the engine. 

 

I had also found that = using the=20 un-damped MAP signal for the pressure-referenced fuel pressure = regulator=20 caused rapid pulsations in the fuel pressure.  I don=92t know = that this=20 affected engine operation in any way, but decided it could an unknown=20 stressing factor on the fuel system.  Using the damped MAP signal = eliminated that phenomenon.

 

All of this is = influenced by the=20 location of the MAP measuring ports.  Mine is picked up = relatively close=20 to the ports (about 6=94) and would likely have stronger pulse than if = picked up=20 in an air box at the far end of long runners.

 

Al=20 G.

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