Mack Trucks, Allentown, Pa., says it will meet October’s emissions requirements with its Application-Specific Engine Technology (ASET).
ASET involves using cooled exhaust gas recirculation (EGR) for on-highway applications. However, the company’s vocational solution is internal exhaust gas recirculation (I-EGR), which alters valve timing to allow a small amount of exhaust gas to remain in the cylinders of the engine from one combustion cycle to the next. This eliminates the plumbing, valving and heat exchanger needed for cooled EGR. “Our vocational customers wanted a simplified approach, and one that is optimized for their operational environment,” says Steve Homcha, executive vice president for Class 8 programs.
Mack vehicles using I-EGR engines as of October 1 include the new Granite Series, as well as RD6, MR, LE, DM and RB models. Seven engines will be available with varying horsepower ratings, including three Maxidyne models (300-horsepower, and new 335- and 370-horsepower versions) and four Econodyne versions (350-, 400-, 427- and 460-horsepower).