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Reload this Page Burned pistons and valve or normal?
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  #11  
Old 04-29-2016, 12:06 PM
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erich weaver erich weaver is offline
 
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Basics of borescope evaluation of exhaust valves here:

https://www.aopa.org/-/media/Files/A...ster_Final.pdf

erich
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  #12  
Old 04-29-2016, 02:43 PM
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Bob,

Good info and pics of what burned exhaust valves look like here:

http://www.avweb.com/news/savvyaviat...-197497-1.html

Agree with the other posters; looks normal, keep flying...
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  #13  
Old 04-29-2016, 03:22 PM
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Here is a shot of the #1 exhaust valve. It looks good to me.
I appreciate the knowledge base on this forum and everyone's willingness to help. Based on what I've learned and the feedback here I have two things to say

"Clear Prop"
"Smoke ON"

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  #14  
Old 04-29-2016, 07:48 PM
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What's the compression on Cylinder 4? If the valve is burned, wouldn't the compression be low?
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  #15  
Old 04-29-2016, 10:05 PM
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Default Compression
Recently done with the engine warm:
79/80
I really wasn't too concerned about the valve, it was the crud on the piston.
Bob
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Last edited by bobmarkert : 04-30-2016 at 04:34 AM.
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  #16  
Old 04-30-2016, 08:34 AM
cccjbr6 cccjbr6 is offline
 
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Mike Busch does a great webinar on cylinders that includes borescope photos and explanations. http://www.eaavideo.org/video.aspx?v=1204537102001
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  #17  
Old 04-30-2016, 08:43 AM
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If the valve was really burned it'd be turning orange or greenish in color.
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