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CHT probe placement
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jcrowder(at)lpbroadband.n
Guest

Posted: Mon Sep 29, 2008 8:38 am Post subject: CHT probe placement

Terry,

Very interesting.  I have written Water but not heard back yet.  I sent him

a very brief description of what I had done and asked whether his graphic

screen could be used real time for data display.  Mine is set up to display

in red if data is out of limits, yellow if marginal, and green if normal.

If the pilot sees green everything is sweet.  Since he is also using Excel,

some combining might be possible.



Thanks.



Jim Crowder

Kitfox 5

Jabiru 3300 install in progress



[quote] --

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Sep 29, 2008 9:49 am Post subject: CHT probe placement

Oh yeah, that works like a charm....looks great, too.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs, and counting...all systems are go, or nearly so...

On Sep 29, 2008, at 10:35 AM, Jim Crowder wrote:



[quote] Lynn,

 I have converted the screen shot to an Adobe PDF document and  

 attached it

 here.  That should work better for everyone.

 Jim Crowder



> --

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Tue Sep 30, 2008 2:29 pm Post subject: CHT probe placement

I did some tests today regarding the CHT probe placements on my  

Jabiru 2200 engine. I'm cross-posting this so others can benefit, and  

even make assumptions regarding other engines, perhaps. I was  

wondering out loud about how the different mounting locations for the  

thermocouple probes might affect the readings of the cylinder head  

temps. During my recent overhaul, I decided I didn't like the "under- 

the-spark-plug" mounting location, so I changed to a location that  

required me to drill into the head, tap it for an 8-32 machine  

screw...actually a socket head cap screw...and affix the proper  

electrical terminal onto the end of the t'couple probe...after  

removing the spark plug terminal of course.



First I went up and got some CHT numbers as the basis for comparison.  

I noted that cyl. #1 ran 317, 327, and 340° F, during various phases  

of flight. Noting these, I then took the probe from cyl #3 and  

attached to it a spark plug terminal (12mm), and installed it onto  

the spark plug that lives over the exhaust valve on #1 cylinder. I  

first removed the spark plug washer like Jabiru says to do, installed  

the probe/terminal, then reinstalled the spark plug washer, and  

reinstalled the plug. Then went flying again.



Here is how I'll report the numbers....I'll call the new location  

(the machine screw termination) CHT, and the spark plug termination,  

SP, as In (CHT/SP)



The numbers I got were as follows (with an ambient of 61° F)   (drum  

roll please)....initial taxiing= (250/220); taxiing further=  

(266/230); climbing out= (308/232); further  climbing=(321/243);  

leveling off (not recorded for how long level)= (330/245); not noted  

what attitude, but not climbing=(334/249); climbing again briefly= 

(344/248) I noted that the max differential was 96° F, and the  

climbing EGT's were in the high 1200's. I didn't have enough hands,  

instruments or inclination to record every aspect of the test, but I  

got enough to satisfy myself that my new locations for the CHT probes  

work, and now I can rest assured that I'm not overheating the engine  

as I thought I might when I first started it up with this  

configuration. Needless to say, the CHT's now apparently rise more  

quickly, and if you're like me, and you've been accustomed to seeing  

it rise slowly and only into the low to mid- 200's, the ol' pucker  

factor rises just as quickly and the finger gets close to the panic  

button, but it's just numbers, and now that I've done some testing,  

I'll relax a bit on this subject at least.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs, and counting...all systems are go, or nearly so...

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

jcrowder(at)lpbroadband.n
Guest

Posted: Tue Sep 30, 2008 9:02 pm Post subject: CHT probe placement

Lynn,

I have decided to use the factory holes on my 3300 and surface mount the

sensors using the 8-32 machine screws.  Did you use steel, stainless steel,

or aluminum screws?  I am thinking maybe aluminum if I can find them.  I can

guess what the issues might be.



Jim Crowder

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Oct 01, 2008 2:36 am Post subject: CHT probe placement

I used stainless steel socket head cap screws (Allen bolts, as they  

are commonly called). I don't think I'll have an issue with them.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs, and counting...all systems are go, or nearly so...

On Oct 1, 2008, at 12:59 AM, Jim Crowder wrote:



 	  Quote: 	
		   

 <jcrowder(at)lpbroadband.net>



 Lynn,

 I have decided to use the factory holes on my 3300 and surface  

 mount the

 sensors using the 8-32 machine screws.  Did you use steel,  

 stainless steel,

 or aluminum screws?  I am thinking maybe aluminum if I can find  

 them.  I can

 guess what the issues might be.



 Jim Crowder

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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