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Date: Mon, 20 Jul 2009 09:20:19 -0500
Message-ID: <5cf132c0907200720i65791f4cp15331ee4ae325f31@mail.gmail.com>
Subject: Re: [FlyRotary] Alternator Filter
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Joe,

The first thing to come to mind is that with the alternator on-line you have
a higher bus voltage which would cause the electric fuel pump to run faster
and produce more pressure.  But the fuel pressure regulator should take care
of the higher pressure, assuming it is working properly.  If the fuel
pressure does rise when you bring the alternator on-line, then that could
cause the engine to go rich and run rough.  Just a thought...

Mark S.

On Mon, Jul 20, 2009 at 8:38 AM, <jewen@comporium.net> wrote:

> Tuning is coming along pretty well on my newly running 20B.  I have run
> into a bit of a snag.  Until last week I was running only on battery power,
> then I brought my alternator on line.  When the alternator is turned on, the
> engine starts to stumble and run rough.  As soon as the alternator is turned
> off it starts to run smoothly again.  Any suggestions for alternator
> filtering?
>
> Thanks,
> Joe
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div>Joe, </div>
<div>=A0</div>
<div>The first thing to come to mind is that with the alternator on-line yo=
u have a higher bus voltage which would cause the electric fuel pump to run=
 faster and produce more pressure.=A0 But the fuel pressure regulator shoul=
d take care of the higher pressure, assuming it is working properly.=A0 If =
the fuel pressure does rise when you bring the alternator on-line, then tha=
t could cause the engine to go rich and run rough.=A0 Just a thought...</di=
v>

<div>=A0</div>
<div>Mark S.<br><br></div>
<div class=3D"gmail_quote">On Mon, Jul 20, 2009 at 8:38 AM, <span dir=3D"lt=
r">&lt;<a href=3D"mailto:jewen@comporium.net">jewen@comporium.net</a>&gt;</=
span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Tuning is coming along pretty we=
ll on my newly running 20B. =A0I have run into a bit of a snag. =A0Until la=
st week I was running only on battery power, then I brought my alternator o=
n line. =A0When the alternator is turned on, the engine starts to stumble a=
nd run rough. =A0As soon as the alternator is turned off it starts to run s=
moothly again. =A0Any suggestions for alternator filtering?<br>
<br>Thanks,<br>Joe<br><font color=3D"#888888"><br><br><br>--<br>Homepage: =
=A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http://www.flyro=
tary.com/</a><br>Archive and UnSub: =A0 <a href=3D"http://mail.lancaironlin=
e.net:81/lists/flyrotary/List.html" target=3D"_blank">http://mail.lancairon=
line.net:81/lists/flyrotary/List.html</a><br>
</font></blockquote></div><br>

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