"Diesel engine" means, for the purposes of 35 Ill. Adm. Code 217, Subpart Q, a compression ignited two- or four-stroke engine in which liquid fuel injected into the combustion chamber ignites when the air charge is compressed to a temperature sufficiently high for auto-ignition.
Ill. Admin. Code tit. 35, § 211.1740
Added at 31 Ill. Reg. 14254, effective September 25, 2007