Speaking at the 2002 Mid America Trucking Show, Mack executive vp of Class 8 programs Stephen Homcha said the OEM has developed one Application Specific Engine Technology (ASET) engine for highway fleets and the other for vocational applications.
Homcha said its ASET engines for on-highway fleets will use cooled EGR (C-EGR) technology, while vocational fleet engines will be equipped with internal EGR (I-EGR) technology.
The difference between the two EGR systems is that C-EGR recirculates exhaust back into the engine's combustion chamber to burn off emissions, while I-EGR keeps the exhaust in the engine's cylinders from one combustion cycle to the next to reduce emissions.
Homcha explained that the reason I-EGR technology won't be used for its on-highway engines is that the fuel penalty would be too severe. However, I-EGR does not cause the same fuel penalty level when used in vocational operations. Mack said its C-EGR engines would have a fuel penalty of around 3% and cost around $3,000 extra.
Mack also announced that it has added a new day cab tractor model to its line of trucks. The Vision DayCab is available in both Class 8 tractor and straight truck configurations, in either single rear or twin rear axle combinations. The vehicle offers GVW ratings from 35,000-60,000 lbs., the company said.
Mack added that the Vision DayCab would go into limited production in June of this year before full production ramp-up occurs in October.
