I'm not going to even attempt to "run with the big dogs" on this discussion.

 

My two cents I got from Robert Williams at Lancair.  He said they remove the padding in the firewall blanket at the engine mount points by picking it out with needle nose pliers before mounting the blanket to the firewall.  They don't damage the face or the back of the blanket that way.  The padding has a tendency to compress, loosening the engine mount bolts.

 

Of course I heard this from Robert AFTER I had my engine installed.  Consequently, I check the torque on my engine mount bolts at each condition inspection.  The first year they were slightly loose, a quarter turn on the bolt or so to reestablish torque.  Since the first year (two more years) no additional tightening needed.

 

Mike Easley

Colorado Springs

Super ES