Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 452677 for flyrotary@lancaironline.net; Mon, 04 Oct 2004 20:05:40 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao01.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20041005000510.TRP13706.fed1rmmtao01.cox.net@BigAl> for ; Mon, 4 Oct 2004 20:05:10 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] OIL METERING PUMP Date: Mon, 4 Oct 2004 17:05:25 -0700 Message-ID: <000001c4aa6f$03f6bc50$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4AA34.5797E450" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4AA34.5797E450 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] OIL METERING PUMP =20 =20 Richard; =20 Thanks for input on this. That relieve hole looks very large and not = likely to blocked, especially on a newly rebuilt engine. Or am I looking at the wrong thing; how does the oil get into the recess? =20 Oil entering the pump can leak past the adjuster shaft if the seal was = bad, right? And what happens to the oil that enters the piston with the = blocked exit port as the piston moves to eject the oil? I was thinking it gets forced back past the piston into the drive area where it can then leak = past the adjuster shaft, but I guess the feed oil is in that area anyway. = Still; it seems forcing the piston against the oil with no exit port would put = high stress on the drive plate, no? =20 Al Al, =20 here is some more info on the OMP oil feed. Oil is coming into a recess in the pump drive shaft. The thus formed = cavity has a relieve hole as shown in the pic, making the pressure in the = cavity practically even with the crank case pressure, depending someway on the = flow rate. The roll pin in the relieve hole is to make sure there is no air pocket in the cavity, which is connected to the pump intake. Each out put is driven by a separate piston and two are together per = stroke. Each stroke is small enough not to create a problem when you block a = line off. It Would not hurt the pump if two outputs are connected for double = oil flow. =20 I hope it is clear, and not confusing. =20 =20 Richard Sohn N-2071U unicorn@gdsys.net ------=_NextPart_000_0001_01C4AA34.5797E450 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] OIL METERING PUMP

Richard;

Thanks for input on this. = That relieve hole looks very large and not likely to blocked, especially on a = newly rebuilt engine. Or am I looking at the wrong thing; how does the oil get = into the recess?

Oil entering the pump can leak = past the adjuster shaft if the seal was bad, right? And what happens to the = oil that enters the piston with the blocked exit port as the piston moves to = eject the oil? I was thinking it gets forced back past the piston into the = drive area where it can then leak past the adjuster shaft, but I guess the = feed oil is in that area anyway. Still; it seems forcing the piston against = the oil with no exit port would put high stress on the drive plate, = no?

Al

Al,

here is some more info on = the OMP oil feed.

Oil is coming into a recess = in the pump drive shaft. The thus formed cavity has a relieve hole as shown in = the pic, making the pressure in the cavity practically even with the crank = case pressure, depending someway on the flow rate. The roll pin in the = relieve hole is to make sure there is no air pocket in the cavity, which is connected = to the pump intake.

Each out put is driven by a separate piston and two are together per stroke. Each stroke is small enough not to = create a problem when you block a line off. It Would not hurt the pump if = two outputs are connected for double oil flow.

I hope it is clear, and not confusing.

Richard Sohn
N-2071U
unicorn@gdsys.net

=

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