Posted for "Bryan Burr" <bjburr@mwheli.com>:

 Usually at the point that I pass 10000' I am planning a continued climb
 to something higher.  Therefore I am at full rich.  In the summer to
 maintain cyl temp cooling I keep the airspeed over 140.  If I turn on
 the low boost over 10000' the egt's climb about 30 degrees (still
 acceptably cool) and the cht's (1&2) will climb over 400 degrees
 (unacceptable to me).  If I keep the boost pump off I can keep the cht's
 in check.  Once established in cruise I can reduce rpm, mp, and mixture
 and turn on LOW BOOST and keep all the temps managed.
 
 My question still is why does the LOW BOOST create a reduction in fuel
 flow which in turn results in climbing EGT and CHT?  It would seem
 logical that the fuel boost pump is causing a restriction (although it
 is providing an additional pressure source to the engine driven fuel
 pump)that results in a leaning effect.
 
 Bryan
 N132BB