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CHT update

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recapen(at)earthlink.net
Guest

Posted: Mon Nov 23, 2009 3:23 pm Post subject: CHT update

As many of you may know, I have been obsessing a bit about my CHT's...to  get them consistent.



Here's the setup:

IO360B1F6

9.2:1  pistons

AFP Fuel Injection

LASAR Ignition with CHT sender relocated to  allow for testing

Vetterman Dual Crossover Heater/Mufflers

SamJames cowl  and plenum

Advanced Flight Systems 3400 Engine Monitor



Oil Cooler  mounted behind #4 cylinder

Air for both Heater/Mufflers behind #3  cylinder



For constant power setting, here's the consistency that I have  achieved:

#1 and #3 cylinders run within three degrees (avg) of each  other

#2 and #4 cylinders run within three degrees (avg) of each other

The  #1/#3 cylinders run 8.5 degrees hotter (avg) than the #2/#4  cylinders



With the members of the sets of cylinders running this close  each other, I'm thinking that I have the balance (front to rear) for each side  pretty well matched.



I'm trying to wrap my head around what could be  causing the right side to run hotter than the left.  Here's some of what  I'm thinking...: With this plenum set-up, I'm thinking that the pressure/volume  should equalize from left to right.  This would leave me with not much to  change to cause more cooling air to go from the left to the right - meaning that  I probably have to live with the differences.  Alternatively, maybe it's  not really hotter...the two sets of CHT wires for the left side (both equal  length) are about three feet longer than the ones for the right side (again,  both equal length).  Could the difference in the lengths of the wires  account for the reported temperature difference? 



I'm pretty close to  thinking that this is as good as it gets...but I would really like to know  why...



Thanks,

Ralph

   [quote][b]

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dsleepy47

Joined: 15 Dec 2007
Posts: 41

Posted: Mon Nov 23, 2009 6:07 pm Post subject: CHT update

The accuracy of the readings is a different question but the relative flow on each side should be controlled by the length of the baffle below and between the cylinders. increase the length of the baffle for the cold cylinders or or shorten the ones for the hot cylinders to change the balance. Remove the same amount from both ends of baffle if you don't want to change the balance between 1/3 or 2/4. I wouldn't have a pm with calling what you have close enough.

  

 Deems

 

  

Here's the setup:

IO360B1F6

9.2:1 pistons

AFP Fuel Injection

LASAR Ignition with CHT sender relocated to allow for testing

Vetterman Dual Crossover Heater/Mufflers

SamJames cowl and plenum

Advanced Flight Systems 3400 Engine Monitor



Oil Cooler mounted behind #4 cylinder

Air for both Heater/Mufflers behind #3 cylinder



For constant power setting C here's the consistency that I have achieved:

#1 and #3 cylinders run within three degrees (avg) of each other

#2 and #4 cylinders run within three degrees (avg) of each other

The #1/#3 cylinders run 8.5 degrees hotter (avg) than the #2/#4 cylinders



With the members of the sets of cylinders running this close each other C I'm thinking that I have the balance (front to rear) for each side pretty well matched.



I'm trying to wrap my head around what could be causing the right side to run hotter than the left.  Here's some of what I'm thinking...: With this plenum set-up C I'm thinking that the pressure/volume should equalize from left to right.  This would leave me with not much to change to cause more cooling air to go from the left to the right - meaning that I probably have to live with the differences.  Alternatively C maybe it's not really hotter...the two sets of CHT wires for the left side (both equal length) are about three feet longer than the ones for the right side (again C both equal length).  Could the difference in the lengths of the wires account for the reported temperature difference? 



I'm pretty close to thinking that this is as good as it gets...but I would really like to know why...



Thanks C

Ralph



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dsleepy47
N1491R

recapen(at)earthlink.net
Guest

Posted: Tue Nov 24, 2009 5:19 am Post subject: CHT update

Thanks Deems,



I haven't touched the underside baffling from Vans stock configuration.  Good methodology suggestion!  Based on a number of responses - I think I'll probably leave it alone for a while and see how it runs.



Ralph



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dsleepy47

Joined: 15 Dec 2007
Posts: 41

Posted: Tue Nov 24, 2009 9:35 am Post subject: CHT update

That sounds like a reasonable plan to me. My guess without looking up the numbers is that your temperature differentials are with the margin of error for the instrument. If all the temperatures are below your limits I see no reason to change anything. I was just answering your question about how to affect individual cylinder temps not making a recommendation that it was necessary.

  

 Deems





 

[quote] Date: Tue C 24 Nov 2009 08:17:05 -0500

 From: recapen(at)earthlink.net

 To: lycomingengines-list(at)matronics.com

 Subject: RE: CHT update

 

 --> LycomingEngines-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net>

 

 Thanks Deems C

 

 I haven't touched the underside baffling from Vans stock configuration. Good methodology suggestion! Based on a number of responses - I think I'll probably leave it alone for a while and see how it runs.

 		 	   		  Bing brings you maps C menus C and reviews organized in one place. Try it now.   	  Quote: 	
		  [b]

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_________________
dsleepy47
N1491R

recapen(at)earthlink.net
Guest

Posted: Tue Nov 24, 2009 9:52 am Post subject: CHT update

Deems,



All temps are within limits.



Glad to know there's something else I can do.....if it ever becomes necessary.



Flying on.....



Ralph



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thomas(at)koelzer.us
Guest

Posted: Wed Nov 25, 2009 6:02 pm Post subject: CHT update

Are you absolutely convinced the right side is running hotter than the left? Is there instrumentation error and can you confirm accuracy via another method or by swapping sensors?  Do you have EGT numbers to confirm the cylinders are at the proper mixture but the cooling is inadequate?



Just some food for thought.



Tom



Do not archive



On Nov 23, 2009, at 5:22 PM, Ralph E. Capen wrote:



 	  Quote: 	
		   As many of you may know, I have been obsessing a bit about my CHT's...to get them consistent.

 

 Here's the setup:

 IO360B1F6

 9.2:1 pistons

 AFP Fuel Injection

 LASAR Ignition with CHT sender relocated to allow for testing

 Vetterman Dual Crossover Heater/Mufflers

 SamJames cowl and plenum

 Advanced Flight Systems 3400 Engine Monitor

 

 Oil Cooler mounted behind #4 cylinder

 Air for both Heater/Mufflers behind #3 cylinder

 

 For constant power setting, here's the consistency that I have achieved:

 #1 and #3 cylinders run within three degrees (avg) of each other

 #2 and #4 cylinders run within three degrees (avg) of each other

 The #1/#3 cylinders run 8.5 degrees hotter (avg) than the #2/#4 cylinders

 

 With the members of the sets of cylinders running this close each other, I'm thinking that I have the balance (front to rear) for each side pretty well matched.

 

 I'm trying to wrap my head around what could be causing the right side to run hotter than the left.  Here's some of what I'm thinking...: With this plenum set-up, I'm thinking that the pressure/volume should equalize from left to right.  This would leave me with not much to change to cause more cooling air to go from the left to the right - meaning that I probably have to live with the differences.  Alternatively, maybe it's not really hotter...the two sets of CHT wires for the left side (both equal length) are about three feet longer than the ones for the right side (again, both equal length).  Could the difference in the lengths of the wires account for the reported temperature difference? 

 

 I'm pretty close to thinking that this is as good as it gets...but I would really like to know why...

 

 Thanks,

 Ralph

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recapen(at)earthlink.net
Guest

Posted: Wed Nov 25, 2009 6:16 pm Post subject: CHT update

Tom,



Thanks for your input...



I have calibrated the sensors with boiling water and candy thermometer - and 

swapped the sensors enough to know that the sensors are consistent and 

accurate.



The EGT numbers show a good mixture distribution - but I haven't balanced 

the injectors yet.  That may change things when the balancing act is 

accomplished - we'll see.



Some of the other postings provided info on a couple of other places to look 

in the cooling system - just in case.

Most of the other postings told me to go have a coke and a smile - and 

fly-on.



I'm planning to fly for a while - balance my injectors and see what happens.



Ralph

---

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thomas(at)koelzer.us
Guest

Posted: Wed Nov 25, 2009 7:17 pm Post subject: CHT update

Sounds like you have it covered. Cokes and smiles are fine but I always enjoy the challenge of unanswered questions. It's what makes man so great and why we have achieved such heights.



Tom



do not archive



On Nov 25, 2009, at 8:17 PM, Ralph E. Capen wrote:



[quote] 

 

 Tom,

 

 Thanks for your input...

 

 I have calibrated the sensors with boiling water and candy thermometer - and swapped the sensors enough to know that the sensors are consistent and accurate.

 

 The EGT numbers show a good mixture distribution - but I haven't balanced the injectors yet.  That may change things when the balancing act is accomplished - we'll see.

 

 Some of the other postings provided info on a couple of other places to look in the cooling system - just in case.

 Most of the other postings told me to go have a coke and a smile - and fly-on.

 

 I'm planning to fly for a while - balance my injectors and see what happens.

 

 Ralph

 ---

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