Return-Path: Received: from access.aic-fl.com ([204.49.76.2] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 439981 for flyrotary@lancaironline.net; Fri, 01 Oct 2004 19:58:39 -0400 Received-SPF: none receiver=logan.com; client-ip=204.49.76.2; envelope-from=unicorn@gdsys.net Received: from homep276y68tk5 (unverified [204.49.76.107]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Fri, 1 Oct 2004 18:53:45 -0500 Message-ID: <000901c4a811$e3538af0$6b4c31cc@homep276y68tk5> From: "Richard" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] oil injector pump Date: Fri, 1 Oct 2004 18:53:37 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C4A7E7.F5A93E90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C4A7E7.F5A93E90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Al,=20 I just checked a disassembled pump. You are correct, it is a positive = displacement system, however, the high pressure side has no connection = to the pump mechanical drive. The drive section, including the drive = shaft and the control shaft are in the oil intake area, and therefore = low pressure.=20 The problem you see could be that the relieve hole on the drive shaft = housing in the front cover is clogged, which would cause high pressure = on the pump intake. The pump is designed for only a few inches of = pressure on the intake.=20 Hope it helps. Richard Sohn N-2071U unicorn@gdsys.net ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Friday, October 01, 2004 12:13 PM Subject: [FlyRotary] oil injector pump My 20B came with a 4-port injector/metering pump from a 13B with three = ports feeding the 3 rotors and one port blocked. The pump began leaking = (dripping out around the adjustment lever shaft) during the dyno runs; = and then continuing to get worse as the pump finally stopped pumping = after a total of maybe 4-5 hrs operation. The replacement pump pumps = very well, but immediately began showing some leakage. I don't know the outlet plumbing of the pump, but it is a positive = displacement from the plunger, and as metering pump I'm thinking it may = be setup for positive flow to each port; so blocking a port may be the = cause of the leakage and failure. Anyone have some input on this? Thanks, Al ------=_NextPart_000_0006_01C4A7E7.F5A93E90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Al,
 
I just checked a disassembled pump. You = are=20 correct, it is a positive displacement system, however, the high = pressure side=20 has no connection to the pump mechanical drive. The drive section,=20 including the drive shaft and the control shaft are in the oil intake = area, and=20 therefore low pressure.
The problem you see could be that = the relieve=20 hole on the drive shaft housing in the front cover is clogged, = which would=20 cause high pressure on the pump intake. The pump is designed for only a = few=20 inches of pressure on the intake.
Hope it helps.
 
Richard Sohn
N-2071U
unicorn@gdsys.net
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Friday, October 01, 2004 = 12:13=20 PM
Subject: [FlyRotary] oil = injector=20 pump

My 20B came with a = 4-port=20 injector/metering pump from a 13B with three ports feeding the 3 = rotors and=20 one port blocked.  The pump began leaking (dripping out around = the=20 adjustment lever shaft) during the dyno runs; and then continuing to = get worse=20 as the pump finally stopped pumping after a total of maybe 4-5 hrs = operation.=20  The replacement pump pumps very well, but immediately began = showing some=20 leakage.

 

I don=92t know the = outlet plumbing=20 of the pump, but it is a positive displacement from the plunger, and = as=20 metering pump I=92m thinking it may be setup for positive flow to each = port; so=20 blocking a port may be the cause of the leakage and = failure.

 

Anyone have some input = on=20 this?

 

Thanks,

 

Al

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