Topic: Longest production run of any engine?
I've been working on doing a TTAC post about the engines with the longest production runs, but it proved impossible for me to get the numbers accurate enough to satisfy TTAC's legions of super-anorak stats fanatics (just try to figure out Lycoming aircraft engines, for example, and I'm sure several Chinese factories are still making copies of the Nissan copies of the BMC A, and so on) so I just posed it as a debate topic for the readers. I figure Lemons racers probably know even more engine trivia than TTAC readers, so y'all are encouraged to join in the debate.