Thanks to the latest improvements to the A26 engine (GES of 2021), the engine now enjoys an additional 4% fuel economy advantage, achieved through engine design and updates to the engine. system, compared to the A26 engine at launch, according to Navistar. Built from the crankcase of the MAN D26 engine, this latest version of the International A26 produces up to 515 horsepower and 1,850 lb-ft. of couple.
Navistar described the biggest improvements to the A26 engine.
Combustion improvements: Increased compression ratio from 18.5: 1 to 20.5: 1, delivers higher combustion efficiency, as well as maximized fuel injection pressure thanks to the 2,500 high pressure common rail fuel system bars.
Optimized engine temperature control: The design of the cylinder head coolant passages helps reduce parasitic losses at the water pump, as well as the addition of a variable water pump for more optimized uptime compared to an on-the-go. ” constant.
Air Management System Updates: An optimized Exhaust Gas Recirculation (EGR) cooler and intake throttle valve create more efficient charge air flow. In addition, the variable geometry turbocharger provides the desired charge air pressure over a wide range of engine speeds, loads and lift.
Reduced engine speed without compromising on power: Higher power output provides maximum power when needed, while operation at lower rpm optimizes the amount of fuel consumed during operation.
When paired with updates to the International LT series, Navistar noted that it adds up to a 6% fuel efficiency improvement. These design and system updates include more optimized engine and transmission calibrations associated with the Eaton Cummins Endurant automated manual transmission, a direct drive ratio of 2.15, and aerodynamic improvements to the hubcaps on the wheels of drive axle and chassis.