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Date: Tue, 13 Sep 2005 00:23:10 -0500
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: New Subject... Vapor pressure changes with premix
 oil
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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, 
> 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?
>      
>     Bobby
>
> Since the oil is harder to vaporize it should reduce the tendance to 
> vapor lock. I always get crossed up on vapor pressure, higher is 
> harder to vaporize? I sure you get the idea.
> Bill Jepson
> PS the oil can reduce the octane level if mixed in high enough 
> quantity although at the 100:1 needed for the rotary I doubt if you 
> would even notice it's there. Bill