What's the group's general opinion about 10:1 compression?   I like the idea (higher efficiency).  I found that raising the compression on my old Grumman AA5 from 7.x to 8.5 vastly improved the climb and high altitude performance.  I'd be interested in your practical experiences of going to 9 or 10:1.

 

If I understood correctly, when running LOP, you can expect more power for any fuel flow at higher compressions:

Comp  HP/gph

 7.5      12.7

 8.5      13.9

 9.0        ?

10.0       ?