On another point – you say you
lean to 1300 degrees on climb out. I am surprised by 1300 degrees.
(Although I know that EGTs can differ according to installation, and since I
have a 10:1 compression engine my EGTs should be lower.)
I arrived at 1300
degrees as recommended at the Advanced Pilot Seminar after Sun n Fun last
year. Assuming you have a fuel flow of at least 29 gallons per hour
(they say 30 is better) on a stock IO550-N, look for the hottest EGT on the
hottest cylinder (mine is #6) during takeoff to about 150’ agl on a near
sea level runway. They say this is a safe number to continue to lean
to during the climb.
How much ROP are you when you
climb?
I’ll have to
check.
Steve
Colwell Legacy almost stock IO550-N with stock
pistons
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf Of Douglas
Brunner
Sent: Monday, July 12, 2010 2:53 PM
To:
lml@lancaironline.net
Subject: [LML] Re: Fuel Control
problem
Steve,
I always put on low boost
above 10,000 for “vapor suppression”. On several occasions, I have
experienced fluctuating decreases in RPM that I attributed to “vapor in the
lines”. Putting on the low boost seemed to solve the
problem.
From what I remember of the
Advanced Pilots Course (I took it in Jan of ’06), they suggested that the
problem occurs with hot fuel at high altitudes – and your story seems
to be just that. Suggest you try using low boost over
10,000.
On another point – you say you
lean to 1300 degrees on climb out. I am surprised by 1300 degrees.
(Although I know that EGTs can differ according to installation, and since I
have a 10:1 compression engine my EGTs should be lower.) I lean to
1100 in the climb until I reach 70% power at which time I lean to 1200.
Since my peak EGTs are around 1325 (when I lean at 70% - probably higher at
higher power settings), I figure I am at least 250 ROP when above 70% in the
climb.
If you lean to 1300 in the
climb, what do you think your peak EGTs are?
How much ROP are you when you
climb?
If there are any “lurkers”
from APS, what do you think of 1300?