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  #1  
Old 09-02-2018, 09:37 AM
Ronj41 Ronj41 is offline
 
Join Date: Jan 2008
Location: N. Canton, Ohio
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Default One cylinder temp high

I have been flying my 9 now for 10 years, I recently had a new Catto prop built for the airplane. The prop is doing everything they said it would but now that I have full range on my power settings my number 3 cylinder is fine up to 2350rpms. The engine is an 0235C1 and will turn 1800rpms easily. At 2350 I am running 385 degrees cylinder temp at 2550 it goes up to 405 degrees and at 2600 where I want it in cruse it goes to 420 degrees. 1-2&4 all run at 387. I have made several adjustments to my baffling and have brought it down some. Any ideas as to what else I should look at to cool off number 3 a little better.
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  #2  
Old 09-02-2018, 09:41 AM
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Toobuilder Toobuilder is offline
 
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Many, many threads discussing the #3 issue. Do a search and you will have several hours of reading.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

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  #3  
Old 09-02-2018, 10:18 AM
lr172 lr172 is online now
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by Ronj41 View Post
I have been flying my 9 now for 10 years, I recently had a new Catto prop built for the airplane. The prop is doing everything they said it would but now that I have full range on my power settings my number 3 cylinder is fine up to 2350rpms. The engine is an 0235C1 and will turn 1800rpms easily. At 2350 I am running 385 degrees cylinder temp at 2550 it goes up to 405 degrees and at 2600 where I want it in cruse it goes to 420 degrees. 1-2&4 all run at 387. I have made several adjustments to my baffling and have brought it down some. Any ideas as to what else I should look at to cool off number 3 a little better.
Are you running ROP or LOP in these examples? If ROP, are you full rich or leaned to a certain point? I agree with Michael that there are some tricks to help with #3, however, I didn't see deltas in the 35* range before doing them. Also, all of your CHTs seem high for a 235. You might do some research on generally improving your baffling. In my 320, I run CHTs well under 350 in the summer when running at 2750 and peak EGT and that is with advanced timing. They go lower when LOP.

Larry
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Last edited by lr172 : 09-02-2018 at 10:24 AM.
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  #4  
Old 09-02-2018, 10:56 AM
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Carl Froehlich Carl Froehlich is online now
 
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Location: Dogwood Airpark (VA42)
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Do a GAMI spread data run to check for an air leak on #3.

Carl
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