The development chassis was equipped with a ZZR-1100 motor so we could use the performance of the Radical Clubsport as a benchmark.
Having moved those goalposts, we're now happy to offer the Paradigm with any number of engine options, below [R1 and CBR600 packages are being actively developed]:

Vauxhall/Pinto/K-series
2 litre for Sports/2000 or Supersports classes.

Bikes
any conventional 3/4 cylinder bike engine, in Chain or Shaft drive configurations, to whatever specification your regulations allow. Our engine man has extensive knowledge of all the latest generation of Japanese 4's.  A state-of-the-art dyno compliments his more-than-he- cares-to-remember years of tuning experience.

Other
The engine bay is large enough to accommodate most straight-4  engines, comfortably.  We haven't tried a V8 yet, but we're open to suggestions.