A 4.85 cc (0.296 cuin.) displacement barstock diesel made in relatively small numbers (around 500 in total) in Long Island, New York, USA for less than a year beginning in late 1947. Features variable compression by moving liner rather than the more famiiiar contra-piston arrangement. Very well made indeed, and a fine runner, but extremely heavy and bulky for the power that it develops. For the full Speed Demon story, see my earlier article to be found on the late Ron Chernich's "Model Engine News" (MEN) web-site.