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From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: Altitude Switch -- how's a guy to know?
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Date: Wed, 31 Jan 2007 16:54:27 -0500
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Posted for "Bryan Burr" <bjburr@mwheli.com>:

  While we are discussing the use of the low pressure boost pump over
  10,000' msl I want to state that I do this while operating my TSIO550E
  engine but only after reaching my cruising altitude.
  
  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?
  
  Because of this EGT rise and the need for cooling during climb I do not
  turn on the LOW BOOST until I am ready to establish cruise parameters.
  
  What is the concensus about this situation?  I think it odd to have a
  temp rise.
  
  Thanks,
  Bryan Burr
  N132BB