X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 720275 for flyrotary@lancaironline.net; Tue, 13 Sep 2005 09:06:15 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Disposition-Notification-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: New Subject... Vapor pressure changes with premix oil X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Tue, 13 Sep 2005 08:10:55 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: New Subject... Vapor pressure changes with premix oil Thread-Index: AcW4JCH5DomHJ0tGQN2AH4W85EgDZwAP/3yA From: "Bobby J. Hughes" To: "Rotary motors in aircraft" Bill, Jim, I suspect that mixing the oil in the fuel tanks may give us more altitude margin than then Lyc and Subi's running auto fuel. We need a good chemist to take a SWAG at this. I could not find any research published on the web. Bobby=20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jim Sower Sent: Tuesday, September 13, 2005 12:23 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: New Subject... Vapor pressure changes with premix oil Lower vapor pressure is better. Mogas has high vapor pressure. Oil premixed would tend to lower the vapor pressure (as well as octane, as you stated), but not enough to measure/detect IMO. WRJJRS@aol.com wrote: > In a message dated 9/12/2005 4:18:48 PM Pacific Standard Time,=20 > bhughes@qnsi.net writes: > > Anyone have any data as to what affect mixing two stroke oil with > auto fuel does to vapor pressure? Will it make auto fuel more > tolerant at higher altitudes or less? > =20 > Bobby > > Since the oil is harder to vaporize it should reduce the tendance to=20 > vapor lock. I always get crossed up on vapor pressure, higher is=20 > harder to vaporize? I sure you get the idea. > Bill Jepson > PS the oil can reduce the octane level if mixed in high enough=20 > quantity although at the 100:1 needed for the rotary I doubt if you=20 > would even notice it's there. Bill -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/