I think wankel is really in a very early stage.You can say everything about it,but its just because no one cares about it.Car industries cant leave reciprocating engines and offer wankel as an option on a car.It qould be too expensive for them to produce and to develop in order to assure good reliability.Bear in mind piston engines have gone thru a long series of little improvements that ended up in the engines we have today.The engines on the ford T model weren't supposed to have all the clever stuff and all the performances of today's ones.F3 cars cant have engines like this because no one would risk their money,and Tristan well knows what risk teams are going into when trying something different.Audi got it right with TDI in Le Mans,but it has lots of money to spend in research...