From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: Altitude Switch -- how's a guy to know?
To: lml
Date: Thu, 01 Feb 2007 00:58:16 -0500
Message-ID: <web-1803444@logan.com>
In-Reply-To: <006401c745ba$b70525f0$84affea9@RDTVAIO>
References: <006401c745ba$b70525f0$84affea9@RDTVAIO>
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Posted for "rtitsworth" <rtitsworth@mindspring.com>:

  Bryan,
  Just curious, what happens to fuel flow rates during the No Boost / Low
  Boost transition?  (I'm guessing they go up a small amount - thus a slightly
  richer [or less lean] mixture, ceretis-paribus).
  
  And what happens to CHTs? (I'm guessing they stay nearly the same or go down
  a bit if you're ROP).
  
  High EGT's do not necessarily relate to high CHTs - and can sometimes
  actually be inversely related.  Richer mixtures, can delay combustion
  timing, which can expose the EGT probe to more of the combustion heat.
  There is no max EGT (only a max TIT).
  
  You might want to fwd your message/experience to Walter Atkinson
  (walter@AdvancedPilot.com) for a more informed opinion/prognosis.  I'm only
  good for theory/speculation.
  
  Rick
  

"""
   When the fuel pump is turned on to LOW I get a rise in EGT of about 30
   degrees.  Now I would expect that nothing would change unless there is a
   leaning of the mixture. What is happening by turning on the boost pump
   to lean the fuel/air mixture ratio?
"""