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.
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