The relationships are:
25/255 = 11.11%
40/225 = 17.77%
Increase = 17.77 - 11.11 = 6.66%
Same as 15/255 = 6.66%
Jeff

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bob White
Sent: Monday, March 09, 2009 12:06 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 87 OCTANE MOGAS TEST (SOREL-TRACY, PROVINCE DE QUÉBEC, CANADA)

Hi Yvon,

My interpretation would be the 25 to 40 ml increase represents 15 ml of
alcohol.  That would represent
15 ml alcohol / 200 ml fuel + alcohol = 7.5 %

I've never actually done one of these tests, so if I've got it wrong
let me know. :)

Bob W.


On Mon, 09 Mar 2009 10:58:42 -0400
Yvon Cournoyer <geryvon@videotron.ca> wrote:

>
>     Yesterday I went to the Sorel airport and tested the fuel in my
> Zenith 90 liters tank.
>
>     This fuel already contains two stroke oil in the ratio of 1:130 per
> volume.
>
> In a cylindrical ungraduated container I poured 25 ml of tap water and
> added 200 ml of fuel
>
> After  1 hour and several vigourous shakings I observed an increase in
> the volume of water to 40 ml
>
> The increase is about 4% (?)
>
> All quantities are approximate.
>
> Since I began running and flying my 1986 Mazda 13B engine, I have tested
> in flight all grades of mogas and also 100LL avgas. I would wait until
> my fuel level was very low and would fill my tank with the différent
> grade. Never detected a change in the performance of my engine. The only
> times I drew water from my fuel tank was when it was filled with 100LL
> avgas.
>
> Yvon Cournoyer.
>
>
>  
>
>
> --
> Homepage:  http://www.flyrotary.com/
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