Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 450346 for flyrotary@lancaironline.net; Sat, 02 Oct 2004 11:29:56 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.36; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao03.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20041002152925.TCHD15891.fed1rmmtao03.cox.net@BigAl> for ; Sat, 2 Oct 2004 11:29:25 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: oil injector pump Date: Sat, 2 Oct 2004 08:29:35 -0700 Message-ID: <002201c4a894$9f4211f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0023_01C4A859.F2E583E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C4A859.F2E583E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: oil injector pump =20 That is interesting. Where exactly is the relief hole - near where the shaft comes through. I don't recall seeing anything when I had the pump off, although I couldn't really get a close look because of things that = are in the way.=20 =20 I'm still wondering what happens with the blocked port; where does that = oil go? Could that force leakage back along the shaft into the low-pressure side, maybe more than the relief port can handle. =20 Thanks for your help, =20 Al =20 Hi Al,=20 =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. =20 Richard Sohn N-2071U unicorn@gdsys.net =20 ----- 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 =20 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. =20 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. =20 Anyone have some input on this? =20 Thanks, =20 Al ------=_NextPart_000_0023_01C4A859.F2E583E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: oil injector pump

 

That is interesting.  Where = exactly is the relief hole – near where the shaft comes through.  I = don’t recall seeing anything when I had the pump off, although I = couldn’t really get a close look because of things that are in the way. =

 

I’m still wondering what = happens with the blocked port; where does that oil go? Could that force leakage = back along the shaft into the low-pressure side, maybe more than the relief = port can handle.

 

Thanks for your = help,

 

Al

 

Hi Al,

 

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.

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. =

Hope it = helps.

 

Richard Sohn
N-2071U
unicorn@gdsys.net

=

 

=

----- Original Message = -----

From: Al = Gietzen

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

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