Return-Path: Received: from mail.rdc1.ct.home.com ([24.2.0.66]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 29 Feb 2000 11:19:35 -0500 Received: from C855175A ([24.2.179.94]) by mail.rdc1.ct.home.com (InterMail v4.01.01.07 201-229-111-110) with SMTP id <20000229162506.EKUS2464.mail.rdc1.ct.home.com@C855175A> for ; Tue, 29 Feb 2000 08:25:06 -0800 Message-ID: <003c01bf82d1$9675edf0$5eb30218@CLNVL1.CT.HOME.COM> Reply-To: "Neal Garvin" From: "Neal Garvin" To: "Lancair List" Subject: New Vac Pump - Minimal Low RPM Vacuum? Date: Tue, 29 Feb 2000 11:25:24 -0500 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I just replaced the vacuum pump on an IO360 and on the initial runup the gage indicated only 1-2" at idle, 3" at 1200 rpm, 4" at 1400 rpm and 5" at higher rpms. This is less vacuum at low rpms than the old pump produced which is why I replaced it to begin with - and the fact that it had almost 1000 hrs on it. Is this the typical performance of vacuum pumps at low rpms? The old pump was an Airborn 211CC, the new one is an Airborn 215CC (new, not remanf). It is only driving the AI & DG. My concern is that while sitting for an extended period waiting for an IFR release or at any prolonged time at idle, the gyros will start spinning down. I have not had a chance to fly it due to pea soup fog all weekend. Perhaps a new pump gets better after 15 minutes of running? Neal Garvin ngarvin@home.com >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>