Scott do you think those guys use a surface model for combustion chamber geometry and is touching up the combustion chamber with a ball mill something not even they would bother with? In my world I’m only firing on all cylinders when handwork has been reduced to zero and unshrouding/chamber shaping are going to be requirements in the older head so this topic relates well. Has anyone tried a helical trench, bulge, or other geometry on the tight side rather than just blending up to a scribe mark and/or automated the shaping process for consistency and finish? I would have thought that proven chamber designs would be out there with the huge following behind these engines.
