semidiesel engine

semidiesel engine

[¦sem·i′dē·zəl ′en·jən]

(mechanical engineering)

An internal combustion engine of a type resembling the diesel engine in using heavy oil as fuel but employing a lower compression pressure and spraying it under pressure, against a hot (uncooled) surface or spot, or igniting it by the precombustion or supercompression of a portion of the charge in a separate member or uncooled portion of the combustion chamber.

A true diesel engine that uses a means other than compressed air for fuel injection.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.