Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5.1) with ESMTP id 999638 for rob@logan.com; Sat, 29 Dec 2001 11:50:55 -0500 Received: from smtp004pub.verizon.net ([206.46.170.183]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Sat, 29 Dec 2001 10:51:54 -0500 Received: from GCasey (calnet31-66.gtecablemodem.com [207.175.254.66]) by smtp004pub.verizon.net with SMTP for ; id fBTFqlJ14487 Sat, 29 Dec 2001 09:52:47 -0600 (CST) Reply-To: Reply-To: lancair.list@olsusa.com From: "Gary Casey" To: Subject: LOP Date: Sat, 29 Dec 2001 07:51:09 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit In-Reply-To: <20011228052429.AAA19477@pop3.olsusa.com> Importance: Normal X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> >>Here is what the data shows. At .75 X 350 Hp and operating the engine 50 to 125F rich of peak, the peak internal cylinder pressures will be 10 to 15% higher than the same engine operated at the same 0.75x350Hp with the engine leaned and operating 60 to 90F LOP. AND, operating ROP, the CHTs will be about 30-40F hotter than when LOP at the same horsepower. I have a 100 dollar bill for anybody that can show me any data that is materially inconsistent with what I just wrote.<< I'm afraid I can't get your $100 as I think you are essentially right. But, you say the peak PRESSURES are 10% lower at LOP operation and at the same power setting. Are you taking into account that the manifold pressure will be higher running LOP? I would think that the peak pressure will be close at the same power setting except for the fact that the timing is fixed and the flame speed is slower LOP. I don't think that would be enough to lower the pressure by 10%. As I recall, 50 LOP will be down at least 5% in power, so the MAP will have to be more than 1" higher to get the same power. Gary Casey >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>