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

-----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,
> 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


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