So Tom, we have to realize (even though I am not sure where it's printed) that this is a piston-based class. The rotories were allowed in to fill fields and give racers a place to try a National class (even though STU already allowed that). They were weighted intentionally high so as not to become competitive. We have to accept that is the direction of the class and not try and force the rules to 'make sense' - meaning they are in there on a peripheral basis so we have to keep that in mind.

The larger fear is that if you set the weight properly (at the 1.8 weight) for the 13B, it will find it's way into a Miata and dominate. Remember, conceptually, this is a FWD piston-based engine swap class with parameters to allow other platforms with penalties.