A proven completely successful automotive rotary valve engine has been built by the late Ralph Ogden Watson of Auckland New Zealand, during 1989. The car has covered many trouble free miles from that date and remains in use. Success was achieved as a result of Watson's academic approach to the problem of sealing, his study of previous designs, and his particular combination of knowledge of materials, machining skills, experience with engines, perseverance and realistic expectations. No new or only recently available materials were involved. Full details of the development of the car and engine appear in the book "Ralph Watson Special Engineer," first published 2004, ISBN O-476-01371-2 and available free and easily searchable, on the internet as of 2020. The car is currently owned by Ray Ferner.