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Bobby, be VERY careful with your thought process here. I suspect that you are looking for some insurance from VAPOR LOCK. I seriously doubt that the oil will add enough margin to be measurable. The only way to insure safety is with a correct fuel system design. I am going to use a design similar to Tracy's but I'm going to put 2 fuel pumps in the tank (same tank) instead of downstream of the tanks.
Ken Powell
Bryant, Arkansas
501-847-4721
C150 / RV-4 under construction
-------------- Original message --------------
> 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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