Return-Path: Received: from smtp4.gateway.net ([208.230.117.248]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Sun, 31 Dec 2000 02:50:32 -0500 Received: from oemcomputer (1Cust36.tnt1.coeur-dalene.id.da.uu.net [63.27.107.36]) by smtp4.gateway.net (8.9.3/8.9.3) with SMTP id CAA16746 for ; Sun, 31 Dec 2000 02:58:42 -0500 (EST) Message-ID: <000901c072ff$d2de8800$246b1b3f@oemcomputer> Reply-To: "dfs" Reply-To: lancair.list@olsusa.com From: "dfs" To: "Lancair List" Subject: Re: LNC2 recommended alternator for Lycoming O-320 Date: Sun, 31 Dec 2000 00:01:02 -0800 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> If you use the 60 Amp Mitsbishi alternator (not a bad idea, as they are fairly small), do the math and figure out what the RPM will be at max. engine speed. The ratio of the Lycoming ring gear diameter to the standard alternator pulley diameter may result in an alternator over-speed. (On an automobile, the alternator is usually belted to a much smaller drive pulley, so even at the (usually) higher engine RPM in a car, the alternator's rotor turns at a lower RPM than the potential RPM when driven from the Lyc. ring-gear). While this is not necessarily bad, from an electrical point of view, you may find the rotor RPM too high for long term mechanical reliability. ACS makes a larger diameter alt. pulley for just such conditions. Dan Schaefer >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>