Looking at the majority of posts in this C172 thread, I swear I was reading an 'Auto Engine' forum.
Yers...well.....Thread drift an' all. You know how it is!
Overhead cams, variable valve timing, etc. etc are heavy and produce no worthwhile result for an aircraft engine.
Whilst I would agree with most of that statement
Sunfish; I really do find it somewhat bemusing that an Aircraft engine originally designed in the late 1930's had overhead cams and IIRC, four valves per cylinder!
Something which in auto engines is really only a 'recent' innovation!
Merely a thought.
