Factory Mazda parts quality and their limits, knock/detonation in a rotary engine, lightened rotors, stud kits, clearancing plus ethanol fuel advantages are just a few of the topics discussed with Rob Dahm adding more and more specific details the deeper the discussion gets. Rotary engine building traditionally has had 2 extremes, those building them poorly and blaming engine, and those building them well via experience they don't wish to share sometimes for understandable commercial reasons. Ro