Mack launches 2017 MP7, MP8 engines with more power, new designs, better fuel efficiency

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Updated Apr 26, 2016

Mack Trucks has unveiled its 2017 11-liter MP7 and 13-liter MP8 engines with a handful of advancements designed to simplify maintenance and improve efficiency and productivity.

John Walsh, vice president global marketing and brand strategy for Mack Trucks, says Mack’s new generation engines boost fuel efficiency from 2.1 to 8.8 percent compared with prior model year engines with additional upgrades in power and productivity, while reducing greenhouse gas emissions.

“We have become a leader in innovation,” adds Dennis Slagle, president of Mack Trucks. “We’ve got the best products [now] that we’ve ever made.”

“The product looks amazing,” says Jonathan Randall, Mack’s senior vice president of of sales. “Even the components look amazing, but they perform even better.”

Both engines feature an updated wave piston design that Mack says raises the compression ratio and enables more complete combustion of fuel and a common-rail fuel system that more precisely injects fuel and reduces soot.

“With the pressurized system [and wave piston design], you have much more control and better combustion,” says Stu Russoli, Mack highway and powertrain products marketing manager.

Combined with a two-speed coolant pump, Russoli says these features help increase MP7 fuel efficiency by up to 5.1 percent and MP8 fuel efficiency by up to 5 percent.

Roy Horton, Mack’s director of product strategy, says Mack began planning its attack for Greenhouse Gas 2017 three years ago, for which the company expects to receive full certification later this year.

“At the same time,” he adds, “we decided to update our powertrain platform to improve performance [and] improve efficiencies.”

A number of additional improvements were made to both engines, including a new two-piece valve cover, shimless rockers and a low-pressure fuel system with an enhanced, integrated aftertreatment dosing module to reduce maintenance needs. An updated, double-walled EGR flow sensor helps reduce condensation and soot buildup in cold weather, while a new intake throttle enables a faster warmup when the engine is started.

In addition to efficiency and maintenance improvements, the coming generation engines also deliver more power, Russoli says. With a new 425 horsepower rating, the 2017 MP7 offers 13-liter power in a lighter-weight, efficient 11-liter package.

Targeting long-haul applications, Mack will offer its 2017 MP8 engine with a turbo compounding system engineered to increase in power and efficiency. Turbo compounding converts waste energy from the exhaust into mechanical energy that is fed back to the engine. The system adds up to 50 additional horsepower, enabling an increase of fuel efficiency of up to 8.8 percent.

“What we’ve done here is when the turbo compounding works, it’s actually driving gears within the turbo compounding system,” Russoli adds. “The second turbo runs gears, so it puts 50 horsepower back … so the engine doesn’t have to work as hard. The exhaust gas is putting 50 horsepower into that crank[shaft].”

The additional power generated by the turbo compounding system allows the engine to maintain full torque as low as 900 rpm—200 rpm lower than the current generation engine – enabling a broader operating range in top gear while allowing a truck to hold top gear longer on a hill with declining engine rpm.

The Mack MP8 with turbo compounding is available exclusively with Mack’s Super Econodyne downspeeding package.

The 16-liter MP10, Mack’s most powerful engine and the standard engine for Titan, gets no changes for next model year.

Several of the revised components and technologies found on Mack’s 2017 MP series engines – including the patented wave piston, turbo compounding and the common rail fuel injection system – were derived from research and development work associated with the U.S. Department of Energy’s SuperTruck program.

The SuperTruck program, a cost-shared, public-private partnership, aims to help accelerate the research and development of advanced efficiency technologies to improve the freight-hauling efficiency of Class 8 long-haul tractor-trailer trucks.

The 2017 Mack MP8 is currently available for order, while the 2017 MP7 and MP10 engines will be available in July. The Mack MP8 with turbo compounding will be available for order in October.