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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] What Should My CHTs and Oil Temps Be?
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The mixture setting you are using guarantees the highest possible CHTs=20=

and oil temperature.

Walter


On Nov 13, 2005, at 12:07 PM, MikeEasley@aol.com wrote:


I am trying to determine whether I have an air flow problem or not.=A0=20=

I'm getting CHTs in the 365 to 385 range in cruise, oil temps around=20
205 in my normally aspirated ES.=A0
=A0
11,500 feet
2,450 RPM
25-50 deg ROP mixture +/-
+6F OAT
=A0
Do those temperatures match?=A0 What I mean is that about what you would=20=

expect for oil temp at that=A0cylinder temp?=A0 It seems to me that at=20=

those CHTs I should be down around 185 on the oil temp.
=A0
What=A0is the "ideal" CHT temp in cruise?
=A0
Do I need CHTs in the 350 range, oil in the 180 range in the winter to=20=

have a good summer airplane?
=A0
I have to think my oil cooler is "cooling" because a 10 knot decrease=20
in airspeed gives me a 10 degree increase in oil temp, so air and oil=20
are flowing through the cooler.
=A0
So what I'm getting at is do I need more air for both the cylinders and=20=

cooler?=A0 Or is the air flow fine and the cooler isn't working=20
correctly?
=A0
I think my baffling is pretty good, no leaks, and with only a 20 degree=20=

difference in CHTs between cylinders, I seem to be pretty well setup on=20=

the baffling.=A0 Before I start cutting into my cowl, I thought I'd do=20=

some more homework and make sure I need to.
=A0
I'm going to download my JPI data today and take a closer look.
=A0
Thanks in advance for any insights.
=A0
Mike Easley
Colorado Springs=

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The mixture setting you are using guarantees the highest possible CHTs
and oil temperature.=20


Walter



On Nov 13, 2005, at 12:07 PM, MikeEasley@aol.com wrote:



<fontfamily><param>Arial</param><smaller>I am trying to determine
whether I have an air flow problem or not.=A0 I'm getting CHTs in the
365 to 385 range in cruise, oil temps around 205 in my normally
aspirated ES.=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>11,500 =
feet</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>2,450 =
RPM</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>25-50 deg ROP mixture =
+/-</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>+6F OAT</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Do those temperatures match?=A0
What I mean is that about what you would expect for oil temp at
that=A0cylinder temp?=A0 It seems to me that at those CHTs I should be
down around 185 on the oil temp.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>What=A0is the "ideal" CHT temp
in cruise?</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Do I need CHTs in the 350
range, oil in the 180 range in the winter to have a good summer
airplane?</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>I have to think my oil cooler
is "cooling" because a 10 knot decrease in airspeed gives me a 10
degree increase in oil temp, so air and oil are flowing through the
cooler.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>So what I'm getting at is do
I need more air for both the cylinders and cooler?=A0 Or is the air flow
fine and the cooler isn't working correctly?</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>I think my baffling is pretty
good, no leaks, and with only a 20 degree difference in CHTs between
cylinders, I seem to be pretty well setup on the baffling.=A0 Before I
start cutting into my cowl, I thought I'd do some more homework and
make sure I need to.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>I'm going to download my JPI
data today and take a closer look.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Thanks in advance for any
insights.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Mike =
Easley</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Colorado =
Springs</smaller></fontfamily>=

--Apple-Mail-12--1014602690--