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From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Water in Fuel?? (or another adventure in the aviation events of Ed Anderson)
Date: Mon, 20 Oct 2008 21:42:30 -0800
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John, I think your analysis makes lots of sense for a gravity fed fuel
system (i.e. no pumps).  However, I would think that the EFI pumps would
churn the water and fuel together pretty thoroughly.=20

Yes the pump will mix it up pretty well; but it will separate out again =
in
the line..=20

=20

In any case, I did use some auto gas back a couple of flights ago and =
did
not like it.  The engine had a bit of a miss - nothing bad, but just
noticeable - could have been the plugs needing a change to be fair

It seems to me this is unlikely an effect of using mogas.  Running my =
engine
on the dyno showed a very slight improvement in performance with 87 =
octane
mogas over 100LL.  I think the theory was faster propagation of the =
flame
front in the odd-shaped combustion chamber.  And as you know, the lead =
is no
friend to the spark plugs.

=20

Al

=20


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<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>John, I think =
your
analysis makes lots of sense for a gravity fed fuel system (i.e. no
pumps).&nbsp; However, I would think that the EFI pumps would churn the =
water
and fuel together pretty thoroughly.&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Yes the pump will mix it up =
pretty well;
but it will separate out again in the line.</span></font><font size=3D2
color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;
color:navy'>. </span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>&nbsp;</span></fo=
nt></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>In any case, I =
did use
some auto gas back a couple of flights ago and did not like it.&nbsp; =
The
engine had a bit of a miss &#8211; nothing bad, but just noticeable =
&#8211; could
have been the plugs needing a change to be fair</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>It seems to me this is unlikely =
an
effect of using mogas. &nbsp;Running my engine on the dyno showed a very =
slight
improvement in performance with 87 octane mogas over 100LL.&nbsp; I =
think the
theory was faster propagation of the flame front in the odd-shaped =
combustion
chamber. &nbsp;And as you know, the lead is no friend to the spark =
plugs.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Al</span></font></p>

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style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

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