There was a guy here in the UK, Jim Noone, who raced a rotary engine in our HR1000 inboard class that we run in Europe. The engine came from a Triumph Road Racing bike - those of you who know your bikes will recall that Triumph ran these engines, with a lot of success, in the superbike class in the 1990s
Jim was very successful with it, but the biggest headache was getting people to agree upon the approach to measuring the engine's swept volume - one race it was legal, the next it wasn't. Over time Jim had enough of this uncertainty and eventually swapped to a more convntional engine - a real shame, as I can remember it running and on a long straight away, it really used to wind up and go...
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