X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm11.access.bullet.mail.mud.yahoo.com ([66.94.237.212] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with SMTP id 5112441 for flyrotary@lancaironline.net; Sat, 03 Sep 2011 00:12:26 -0400 Received-SPF: softfail receiver=logan.com; client-ip=66.94.237.212; envelope-from=echristley@nc.rr.com Received: from [66.94.237.196] by nm11.access.bullet.mail.mud.yahoo.com with NNFMP; 03 Sep 2011 04:11:51 -0000 Received: from [66.94.237.114] by tm7.access.bullet.mail.mud.yahoo.com with NNFMP; 03 Sep 2011 04:11:51 -0000 Received: from [127.0.0.1] by omp1019.access.mail.mud.yahoo.com with NNFMP; 03 Sep 2011 04:11:51 -0000 X-Yahoo-Newman-Id: 43013.40362.bm@omp1019.access.mail.mud.yahoo.com Received: (qmail 15975 invoked from network); 3 Sep 2011 04:11:51 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1315023111; bh=wfRqrzBnwdOC0a0aOLdpwc4k20oV+vS700wLcdle1pw=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type; b=AIGlBhsxODp2EmPUC3DcTHjUd0IXRzNzVoz/AilXA9WHBt9uaziPPC6YSXyI2009TuTmcQD0bds2U8hn/7p1Xv59cLQhlshLQThdBsGrAC/7+FqMQgrW91oV/ZdE4X4br5/kEFiHFtKDGQxDZY7ns3Yw+Edn0Crb0IoFRxkHniM= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: pItkoiEVM1nFGIZhovcJQm6KjP7RTIFWwsAL1u.KJpch3sY YCMSp5VfjQO3Wxi9l4Y_AZ4AtdR227ZzMgwm7RPSoU_CzrIL34mn1AVIRjY9 _miCRbLSyWj8rerkYMl65ahOpV0saka_.QJX5ne3sCsPuKeE4r8ByFh0sRQx PjeBUJKyS9tufH_Ar8LMTs7WvNSzAYwyzSu0wA0mfXQN583281i6ZD8KQcWV fcLCk7EiOLK3chMCAZpZCAGJqiiVqZvbCngQKILjzKTrmmmJVOov5HZzwUyP 9rc7c.h8c4ugDZ.PW3uY63bFMFCRZEfNTt5cjXDWy0_n0.udRq2BPNrvOUTG WhniB4xZOp7vslI1ZmDKTCiVr_LgNL.J1YFMzpO8XYpaqdPo8XA-- X-Yahoo-SMTP: 40RP3pGswBDvPav1a.I8eMv.KS8bdgWBnCloVoKaow-- Received: from [192.168.1.2] (echristley@71.70.227.94 with plain) by smtp107.sbc.mail.mud.yahoo.com with SMTP; 02 Sep 2011 21:11:50 -0700 PDT Message-ID: <4E61A8DF.4080304@nc.rr.com> Date: Sat, 03 Sep 2011 00:11:11 -0400 From: Ernest Christley Reply-To: echristley@att.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.18) Gecko/20110617 Lightning/1.0b2 Thunderbird/3.1.11 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: vapor lock References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010700060304010603070709" This is a multi-part message in MIME format. --------------010700060304010603070709 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 09/02/2011 07:00 AM, Bill Schertz wrote: > Actually, if you just mix ethanol with gasoline, the vapor pressure > will go up (not like salt in water). To compensate, the refiners > formulate the gasoline that is going to be mixed with ethanol to have > a ‘lower’ vapor pressure (volatility) so that when the ethanol is > added the vapor pressure is then in the right range. > And for 91 octane, they make the vapor pressure higher than for 87. How else would they hold back detonation. BTW, beautiful work, Steve. Basically, it boils down to (haha, see what I did there) the fact that most people should be more concerned with melting their cowl off than boiling fuel in the line. --------------010700060304010603070709 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit On 09/02/2011 07:00 AM, Bill Schertz wrote:

Actually, if you just mix ethanol with gasoline, the vapor pressure will go up (not like salt in water). To compensate, the refiners formulate the gasoline that is going to be mixed with ethanol to have a ‘lower’ vapor pressure (volatility) so that when the ethanol is added the vapor pressure is then in the right range.

And for 91 octane, they make the vapor pressure higher than for 87. How else would they hold back detonation.

BTW, beautiful work, Steve. Basically, it boils down to (haha, see what I did there) the fact that most people should be more concerned with melting their cowl off than boiling fuel in the line.
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