Compression 20/80 is ok (?)

[Renkou1]

Anyone see the new article with the old Continental Service Bulletin about compression checks?
Think it's in Sport Aviation.
Short story: leaking valves bad!
Leaking intact piston rings causing low compression OK.
Use borescope to check cylinder - valves and broken ring marks instead of pulling cylinder.
More info in article.

 

[FreddyK]

 

[captual]

 

[airknocker]

 

[bob turner]

 

[Renkou1]

 

[FreddyK]

 

[jimrice]

 

[bob turner]

 

[dgapilot]