[Stay on top of transportation news: Get TTNews in your inbox.]
Mack Trucks Reveals EPA 2027-Compliant MP13 Engine
Order Book for Trucks With Engine to Open in August
Key Takeaways:
- Mack Trucks unveiled an EPA 2027-compliant MP13 engine at the Advanced Clean Transportation Expo on May 5.
- Mack said the engine delivers up to 540 horsepower, 1,950 pound-feet of torque and up to 6% fuel savings while meeting a 35-milligram NOx limit.
- Orders open in August with production for model year 2028 across Pioneer, Anthem, Granite and Keystone tractors, with Keystone orders late in the third quarter.
Image
Mack's EPA 2027-compliant MP13 engine. (Mack Trucks)
LAS VEGAS — Mack Trucks unveiled an MP13 engine compliant with the Environmental Protection Agency’s upcoming 2027 nitrogen oxide emissions regulations at the 2026 Advanced Clean Transportation Expo on May 5.
Volvo Group division Mack said the EPA 2027-compliant MP13 would be the most powerful and efficient engine Mack has ever produced, delivering up to 540 horsepower and 1,950 pound-feet of torque.
The EPA 2027 MP13 will be available for order beginning in August, with production timed to model year 2028 vehicles. It will be available for the Pioneer and Anthem on-highway tractors plus the vocational market-focused Granite and Keystone models, Mack said.
EPA is still finalizing the regulations for the emissions standards, which will see the agency leave in place a Biden-era requirement that NOx emissions for heavy-duty trucks drop to 35 milligrams per horsepower-hour from 200 mg/hp-hr.
The truck maker’s announcement followed sister company Volvo Trucks North America in launching its EPA 2027-compliant engine. VTNA on May 4 pulled the curtain back on a D13 engine compliant with the expected regulations. VTNA will offer the engine as part of the standard package for the VNL and VNR on-highway Class 8 tractors.
Mack promised up to 3% fuel savings for fleets buying three models in which the revamped MP13 engine will be available — the Pioneer, Anthem and Granite — while carriers purchasing the Keystone will see 6% improved fuel efficiency compared with its predecessor, the Pinnacle.
We’re at @ACTExpo 2026 in Las Vegas! 💪 Stop by and see us at booth #3633. #ACTexpo pic.twitter.com/Wr6lAeLqTF — Mack Trucks (@MackTrucks) May 6, 2026
The Keystone was unveiled in March, and the tractor is aimed at agriculture, construction and vocational markets. The order book for the Keystone will open late in the third quarter of 2026.
“Every time when we develop an engine towards regulation, obviously meeting regulation is important to us, but being competitive is equally important. And in this case, we were able to get up to 3% of fuel economy improvement efficiency coming to the engine, which then basically gives the value to our end customers when it comes to their total cost of ownership,” Senior Vice President Global Product Owner Govi Kannan said during a presentation to reporters at the launch.
Mack expects the savings to come from a graphite iron rather than gray iron engine, additional wave patterns for the pistons and a heater system for the aftertreatment system.
The engine retained a common rail with a high-pressure fuel pump for the fuel delivery system, but there is a 14-wave piston now to help improve the combustion efficiency, engine propulsion product management director Andrea Brown told Transport Topics on the sidelines of ACT Expo.
Mack also added a 48-volt alternator to provide power to the two heaters in the aftertreatment system. The first comprises a small preselective catalytic reduction to do a first conversion and the second is for the main SCR to carry out the final conversion to the 35-milligram standard.
In addition, the engine has closed crankcase ventilation to reroute the crankcase ventilation.
