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Date: Mon, 19 Nov 2012 08:23:06 -0500
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Unusual LIVP Manifold Pressure Reduction with Altitude Climb: Why so much?
In-Reply-To: <listdigest-5886978@logan.com>
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It will be interesting to see what the real experts say, but it seems to me=
 like the waste gate is blocked from completely closing.=A0 Or there is phy=
sical damage to the turbo itself (broken blades or something).=A0 I'll put =
my money on the waste gate.=0AGary Casey=0A=0AOn a recent flight to Chicago=
, my MAP during WOT climb was normal and ample all the way to cruise FL220,=
 at which time I pulled throttle back to 31.5", dialed down RPM to 2350 (wh=
ich increases MAP some, so readjust) and "Big Mixture Pull" to LOP 16.4gph.=
  All very normal.  Cabin Pressure 5 psid.=0A=0AOn my return, departing dur=
ing 30*F temps and cleaning some overnight rain-ice off the wings (via hang=
er heat), I climbed out of Chicago WOT and had full MAP at departure, but t=
hen observed a decreasing MAP during climb (numbers are below).  Details be=
low.=0A=0AI leveled off at 17,500 and observed WOT ~31" MAP and RPM 2690, 3=
2.3 gph, all engine parameters normal.  I did not reduce throttle, I dialed=
 back RPM to 2350, and observed MAP reduce to 24" (and cabin altitude climb=
ed with 1.5 psid).
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>It will be int=
eresting to see what the real experts say, but it seems to me like the wast=
e gate is blocked from completely closing.&nbsp; Or there is physical damag=
e to the turbo itself (broken blades or something).&nbsp; I'll put my money=
 on the waste gate.</div><div>Gary Casey</div><div><br>On a recent flight t=
o Chicago, my MAP during WOT climb was normal and ample all the way to crui=
se FL220, at which time I pulled throttle back to 31.5", dialed down RPM to=
 2350 (which increases MAP some, so readjust) and "Big Mixture Pull" to LOP=
 16.4gph.  All very normal.  Cabin Pressure 5 psid.<br><br>On my return, de=
parting during 30*F temps and cleaning some overnight rain-ice off the wing=
s (via hanger heat), I climbed out of Chicago WOT and had full MAP at depar=
ture, but then observed a decreasing MAP during climb (numbers are
 below).  Details below.<br><br>I leveled off at 17,500 and observed WOT ~3=
1" MAP and RPM 2690, 32.3 gph, all engine parameters normal.  I did not red=
uce throttle, I dialed back RPM to 2350, and observed MAP reduce to 24" (an=
d cabin altitude climbed with 1.5 psid).</div></div></body></html>
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