As I understand it, that round the world jaunt was an exception. I don’t know how true it is but I’ve heard that in some cases you were lucky if they took you to the other end of the country (exaggeration but you get the idea). There again though that could have been due to the Porsche having different operating procedures to most aero engines and people were using standard aero engine practice which caused the problems, I really don’t know. It is definitely not unusual for people to blame the machinery rather than admit it was their finger trouble that caused the problem.
I never knew they were fitted in so many aircraft, also never knew they did the 4 cyl one. The only one I knew about was the PFM