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Mack releases new version of MP8HE engine

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David Sickels is the Senior Editor of Fleet Equipment. He has a history of working in the media, marketing and automotive industries in both print and online.

Mack Trucks has announced a new version of its 13-liter Mack MP8HE engine that the company says improves fuel efficiency by up to 3% compared to the current MP8HE.

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Mack Anthem models spec’d with Mack’s new extended chassis fairings and the Mack HE+ efficiency package, which includes the revised MP8HE engine, now deliver up to a 13% improvement in fuel efficiency compared with a baseline Anthem model, the company says.

Mack Energy Recovery Technology captures waste energy from the engine’s exhaust, converting it back into mechanical energy delivered to the engine crankshaft as additional torque, the company says. To improve efficiency further, Mack says, its engineers implemented an updated wave piston design that helps to evenly distribute the air/fuel mixture within the cylinder to burn fuel more completely and consistently than traditional piston designs. Additional efficiency gains came by increasing the MP8HE’s compression ratio from 17:1 to 18:1 and adding an improved turbocharger and wastegate.

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The Mack HE+ efficiency package bundles the MP8HE engine, the Mack mDRIVE automated manual transmission, Mack Predictive Cruise and aerodynamic enhancements. The HE+ package can also be combined with Mack’s new extended chassis fairings, which smooth airflow around the rear axles to deliver an additional 0.5% improvement in fuel efficiency, the company says.

The next generation Mack MP8HE engine will continue to be offered in 415 and 445 HP ratings with 1,760 and 1,860 lb.-ft. of torque, respectively.

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