X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Mar 2014 10:21:17 -0400 Message-ID: X-Original-Return-Path: Received: from vms173003pub.verizon.net ([206.46.173.3] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6804693 for lml@lancaironline.net; Fri, 28 Mar 2014 19:34:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.3; envelope-from=n5zq@verizon.net Received: from BillHP ([unknown] [72.86.39.248]) by vms173003.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0N36001196S00U50@vms173003.mailsrvcs.net> for lml@lancaironline.net; Fri, 28 Mar 2014 18:33:37 -0500 (CDT) X-Original-Message-id: From: "Bill Harrelson" X-Original-To: "Lancair Mailing List" References: In-reply-to: Subject: Re: [LML] VMS1000 pressure gauges on LNC2 X-Original-Date: Fri, 28 Mar 2014 19:33:29 -0400 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_003F_01CF4ABC.98A5E630" X-Priority: 3 X-MSMail-priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3538.513 X-MIMEOLE: Produced By Microsoft MimeOLE V15.4.3538.513 This is a multi-part message in MIME format. ------=_NextPart_000_003F_01CF4ABC.98A5E630 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Nick, Assuming that you have a header tank, you should show 1 or 2 psi fuel = pressure at the carb with everything shut down. It=E2=80=99s simply = gravity head pressure. Yet another advantage of header tanks. Did you = also check the oil pressure with a steam gauge?=20 Bill Harrelson N6ZQ IV 500 hrs. Hello All, I=E2=80=99ve got a Lancair 320 and we=E2=80=99ve just re-installed the = engine and are in the process of the annual inspection. Both the fuel and the oil pressure readings on the VMS1000 display are = very strange. The fuel pressure gives a reading when there is no = pressure and the oil pressure reads very low. A quick check with some = old steam gauges suggests the actual pressures are about right. The = pressure sensors are both in the engine bay, fed with flexible hoses. Is this likely to be the pressure sensors? Do they tend to misbehave? Is = there an easy way to check them? Or could it be in the wiring or the = display unit itself. I can=E2=80=99t see anything in the VMS1000 manual = about calibration. Any help gratefully received. Thanks, Nick ------=_NextPart_000_003F_01CF4ABC.98A5E630 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Nick,

Assuming that you have a header tank, = you should=20 show 1 or 2 psi fuel pressure at the carb with everything shut down. = It=E2=80=99s simply=20 gravity head pressure. Yet another advantage of header tanks. Did = you=20 also check the oil pressure with a steam gauge?

Bill Harrelson

N6ZQ IV 500 hrs.

Hello=20 All,

I=E2=80=99ve got a Lancair 320 and we=E2=80=99ve just re-installed = the engine and are in=20 the process of the annual inspection.

Both the fuel and the oil pressure readings on the VMS1000 display = are very=20 strange. The fuel pressure gives a reading when there is no pressure and = the oil=20 pressure reads very low. A quick check with some old steam gauges = suggests the=20 actual pressures are about right. The pressure sensors are both in the = engine=20 bay, fed with flexible hoses.

Is this likely to be the pressure sensors? Do they tend to = misbehave? Is=20 there an easy way to check them? Or could it be in the wiring or the = display=20 unit itself. I can=E2=80=99t see anything in the VMS1000 manual about = calibration.

Any help gratefully received.

Thanks,

Nick

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