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Mark has dropped out of site. He signed a development license for my engine patents in 2000. He altered my design slightly. I was very excited about the rapid progress he made early on. The engine runs very well. He did however have some problems with the cam peening at the transitions of its machined arcs. He defined the cam with only four or five radii per quadrant. There was a slight faceting at these transition point. The last time I talked to him was in reference to that problem. I have not heard from him for over three years now. Thanks for your interest. I am working on the next generation engine design and would love to hear from him.