Rotary Vee Engines

I ran across a two-cycle rotary vee engine the other day built in 1996 by Robert Sullivan of Snyder Oklahoma. According to the link which I will include, it has only 6 moving parts, has a straight line torque curve, develops 400 HP, weighs only 75 lbs and is estimated to achieve 90 MPG. Why would we not be developing this for automotive use?



Here is the link: https://www.youtube.com/watch?v=WUeKVbKVVjk