It's amazing that this all started with my questioning the equivalence factory for rotarys not being fair!! and it has turned into a contest between the 2 wheelers and 4 wheelers and the East and the West!!
John Romero if you look on page 15 of the 2005 rule book it gives the SCTA's equivalent formula. And don't pull our leg you are not going to give up that kick ass Honda to do a rotor motor!! Although they do love turbos!
As Sum points out so well, some engines do lend themselves to small frontal areas and the rotary is certainly one of them, make the equivalent factor 2.2, which would keep the 13B in the F class and I'd build a car with a rotary and bet that it would snag a record. Small, compact, you can mount them very low, even lay them over on their side to get the inlet and exhaust out of the way, not many engines can present as small of frontal area as a rotary.
Rex
