Multi directional serrations on rod big ends were used in WW2 German military aircraft engines.
Back on page 3 (I wish these posts were numbered! Is there a setting I am missing?) a WWII ME airplane rod was shared showing the serrated interface. My question remains though, what does that Pankl crossed serration pattern look like, and how in the world would you machine it? Any chance you have access to any images of that Pankl serrated interface to share?
Thanks for the post here! I was worried the thread had gone the great archive in the sky...