It'll probably be a fracas about automotive vs. aircraft engines, not
certified vs. non-certified. Plenty of people here flying
non-certified Lycoming clones, I bet, but the automotive discussion
seems to create the most heat.

I'm also interested in this subject, and would like to add the Mazda
13B rotary to the mix as a point of comparison, I'm curious about both.

Regards,

Ben Hallert