I figure someone here has a stash of Orbital engines and parts...
https://boston.craigslist.org/gbs/clt/d/newbury-unique-prototype-collectable/7072514080.html
Craigslist Guy says:
Back in the 1990's a Western Australia company called Orbital Engine, Ltd. perfected a direct-injection system that rendered 2-stroke engines clean and fuel efficient. It also rendered 4 strokes more efficient and more readily optimized without after-treatment or alteration of existing catalytic converter systems.
At various times Ford, GM, Mercedes-Benz, and Saab considered using this system in cars. Mercury outboards Optimax line uses the same system. Ford actually began outfitting a production facility in Tecumseh Michigan but then cancelled. Currently Orbital Engine supplies variants of the system for powering drones. Several scooter companies began installing the system in the early 00's, which spurred technology improvements in small 4 strokes, which killed the market for small 2-strokes despite their superior performance.
There is a unique MIT connection there in that the Ford initiative was cancelled in part due to the input from Dr. John Heywood from the Sloan Automotive Lab.
I came by prototype 001 in the late 1990s and have provenance as well as technical manuals and testing/monitoring software (in old format). I also have the emissions testing records for when I drove it in Connecticut and New Hampshire. However, two years ago the engine began making "bad noises" and my adventurous mechanic retired so I've not had means to maintain it.
I'm looking for a good home for it, preferably with someone who has some idiosyncratic interest in "what might have been" cars. If you're that special "unique" someone, get in touch and we can correspond further about this.
Thanks for your interest.