Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b9) with ESMTP id 968193 for rob@logan.com; Sat, 08 Dec 2001 19:29:57 -0500 Received: from rook.innercite.com ([158.222.5.8]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Sat, 8 Dec 2001 19:05:07 -0500 Received: from colwell (host-226-79.dialup.innercite.com [158.222.226.79]) by rook.innercite.com (8.11.6/8.11.6) with SMTP id fB905P713736 for ; Sat, 8 Dec 2001 16:05:25 -0800 Message-ID: <002001c18045$5c0dedc0$4fe2de9e@colwell> From: "Steve & Claudette Colwell" To: References: <002101c18029$88dd3f20$abd8cf18@home.charterstl.com> Subject: Re: PreHeat Date: Sat, 8 Dec 2001 16:06:31 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> > So, how important is it to have a pre-heated engine during the coldest > months? As long as the > engine starts and is warmed up at the lowest possible rpm, is there any > compelling reason to preheat? According to John Schwaner, author of Sky Ranch Engineering Manual, http://www.sacskyranch.com/emframe.htm an engine should be at 1100 to 1200 RPM ASAP on starting to allow splash lubrication of the cylinder walls, pistons, rings, cam and cam followers. He also says the inertia of the valve train lowers the loads on the cam followers (lifters and camshaft lobes) during this critical first few seconds when the most wear and maybe damage occurs. Ever notice your automobile starts at about 1200 rpm and slowly reduces its idle speed depending on how cold it is? Engine Starting and Idle is 4 pages worth including preheat, oils, differences between Lyc and Cont etc.. This is the definitive book on Aircraft Engine Operation, Failure and Repair in my opinion. John is a local and has spoken at EAA events on many occasions, has been quoted in Light Plane Maintenance, TBO Advisor, etc.. Steve Colwell Legacy 2K Placerville,CA (530) 621-3408 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://members.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please remember that purchases from the Builders' Bookstore assist with the management of the LML. Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>