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Biplane racers at Reno often run up to 3500 rpm on their
IO-360s. I've always been under the impression that it was the prop that needed
a look-over after an overspeed, since CF goes up with the square of rpm.
It's hard for me to imagine that the valve springs would start to float under,
say a 30% overspeed from 2700 rpm to 3500 rpm. A lot of helicopter IO-360s and
IO-540s operate in the 3000s! Even the little
supposedly stock O-200s in F1 turn up to 4500
rpm!
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