Mack has finally brought the MP8 engine to market. When it was announced in October 2005, there were two working MP8 engines in existence. While Mack has had considerable uptake on the 10.8-litre MP7 engine over the past 18 months, its beefier brother, the 13-litre MP8, has been in field and customer trials for the better part of a year. It’s been in the databooks for several months now in Pinnacle on-highway and Granite vocational trucks, but it wasn’t formally rolled out until the Mack Performance Tour launch in early June.
The MP8 is an inline-six, cooled-EGR engine rated at 415, 425, 445, 455, and 485 hp, with an advertised dry weight of the 2560 lb. It will be available in all three of the company’s power-map configurations: Econodyne, for maximum fuel economy in steady-state on-highway applications (1560-1660 lb ft); MaxiCruise, for high-performance on-highway and vocational applications (1560-1660 lb ft); and Maxidyne, for vocational applications only (1540-1700 lb ft).
Base warranty is 3 years/300,000 miles with Extended Bulldog protection plans available that can be tailored
to customer needs.
The MP8 boasts a high horsepower to weight ratio, with a power density of 31.9 to 37.3 hp per liter, and Mack
says customers can expect fuel economy gains over the previous ASET engines of about 3% for highway and 6% for vocational use.
MP8 engines feature a single overhead cam, ultra-high-pressure fuel injection, one-piece steel pistons, and electronically controlled Holset variable-geometry turbochargers with coolant loops for the turbo and the actuator. More significantly, Mack has redesigned the EGR cooler, which now utilizes a stainless steel tube-and-insert configuration for even more efficient cooling. There’s a modulated cast stainless steel EGR valve, a chassis-mounted charge-air-cooler, and a 16-litre radiator for improved durability and optimum heat rejection.
Drivers will like the broad torque range of the MP8. The Maxicruise features peak torque of 1600 lb ft all the
way from 1100 to 1600 rpm, while the Econodyne rolls out the same torque from 1100 to 1500 rpm.
Mack’s Performance Tour will bring a fleet of 20 trucks with nearly any spec imaginable to dealers across Canada for customers to ride and drive between July and September.
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