Old articles about Coates' design. Have they answered the questions??? Why alternative engine designs have never met much success.(article from 2011) http://automotivethinker.com/general/why-alternative-engine-designs-have-never-met-much-success/ Another article: Do Rotating Spherical Valves Have A Future In Motorcycling? http://www.cycleworld.com/2014/01/17/ask-kevin-do-rotating-spherical-valves-have-a-future-in-motorcycling/ After reading these articles, my biggest question is: are there any 3rd party evaluations of the Coates engine?