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

  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

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