The Lycoming IO720 variants are what spring to mind in the GA Avgas world and I have fond memories of the New Zealand Fletcher & a few lovely Commanche 400s that were popular in Australia in the 60s, 70s and 80s. (Sadly, I was never able to fly either of these types, but those who did loved them). I wonder what is available in emerging automotive conversions (Chevs) and Diesal engines?
Dr J, Exactly. This is a really interesting, and enjoyable, thread and the opening question at least has a chance of being answered.
C2j, I guess you might be right about post # 2. Maybe. If that's what the SOPs require. But this is Pprune not a peer reviewed journal and what you have just experienced is known as "Thread Drift", which brings nuance, occasional annoyance and sometimes a smile to these forums.
The Original Post of this Antipodean thread from Long ago has since changed YHMB to the correct YMHB. It's a
fine example of Thread Drift.