Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 350021 for flyrotary@lancaironline.net; Mon, 02 Aug 2004 23:59:08 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao05.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with ESMTP id <20040803035836.MPAT14278.fed1rmmtao05.cox.net@BigAl> for ; Mon, 2 Aug 2004 23:58:36 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Oil injection, and more Date: Mon, 2 Aug 2004 20:58:52 -0700 Message-ID: <000001c4790e$32bc70d0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C478D3.865D98D0" 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 V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C478D3.865D98D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 > Perry, > Clarification? Do you mean your throttle-body is spring loaded to=20 > to wide open if disconnected or were you refering to the metering=20 > pump which in stock cofiguration is spring loaded to the closed=20 > position if disconnected? >=20 > Kelly Troyer Sorry about that. The springs on the throttle body force the throttle=20 closed, so I had to reverse those. If my throttle cable breaks, throttle = goes wide open. =20 The spring on the oil metering pump itself forces the pump "full on" if = the=20 linkage is removed between the throttle and the oil metering pump. =20 It is my understanding (from David Atkins) is that the spring on the metering pump forces the control to 'Low' position. Since this is a = critcal issue if relying upon the metered system for seal lubrication I (we) = would be forever grateful if someone would verify which way is which. =20 On a related subject, a posting on the ACRE list follows: Dave Atkins claims the apex seal oil metering system does not work over=20 8000 feet. He also claims the engine will run up to three months in automotive service with no apex seal oil whatsoever. We have some verification of that as George Graham flew his airplane from Tennessee = to New York state while forgetting to mix two cycle oil with the fuel. =20 If it be true, then that also is a bit of a critical piece of = information. But 'why'? The driving force for the metering system oil flow (as best I = can figure out) is the pressure differential between the ambient atmospheric = and the pressure in the combustion chamber during the intake cycle. This = would suggest that for a NA engine there would always be some pressure to = drive the flow.=20 =20 And it is consistent that the metering control lever should be at = lowest flow for closed throttle position (greatest pressure differential), and highest flow position for open throttle position (lowest pressure differential). I'd guess there is the presumption that the lubrication requirement is only a function of RPM, and not power output, and the metering control level is for compensation of the changes in pressure differential. =20 Al ------=_NextPart_000_0001_01C478D3.865D98D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

> Perry,

> Clarification? Do you mean your throttle-body is spring loaded to =

> to wide open if disconnected or were you refering to the metering =

> pump which in stock cofiguration is spring loaded to the closed =

> position if disconnected?

>

> Kelly Troyer

Sorry about that. The springs on the throttle body force the throttle =

closed, so I had to reverse those. If my throttle cable breaks, throttle =

goes wide open.

The spring on the oil metering pump itself forces the pump "full = on" if the

linkage is removed between the throttle and the oil metering = pump.

It is my understanding (from David Atkins) is that = the spring on the metering pump forces the control to ‘Low’ position. Since this is a critcal issue if relying upon the = metered system for seal lubrication I (we) would be forever grateful if someone = would verify which way is which.

<= /font>

On a related = subject, a posting on the ACRE list = follows:

Dave Atkins claims the = apex seal oil metering system does not work over

8000 feet. He also claims = the engine will run up to three months in automotive service with no apex = seal oil whatsoever. We have some verification of that as George Graham flew his airplane from Tennessee to New = York state while forgetting to mix two cycle oil with the fuel.

If it be true, then that also is a bit of a critical piece of = information. But ‘why’? The driving force for the metering system oil flow = (as best I can figure out) is the pressure differential between the ambient = atmospheric and the pressure in the combustion chamber during the intake cycle. = This would suggest that for a NA engine there would always be some pressure = to drive the flow.

<= /font>

And it is consistent that the metering control lever should be at lowest = flow for closed throttle position (greatest pressure differential), and highest = flow position for open throttle position (lowest pressure differential). = I’d guess there is the presumption that the lubrication requirement is only = a function of RPM, and not power output, and the metering control level is = for compensation of the changes in pressure differential.

<= /font>

Al

------=_NextPart_000_0001_01C478D3.865D98D0--