Jason Morgan is the content director of Flyet Equipment. He has more than 15 years of experience in B2B journalism, covering the trucking and construction equipment, real estate, film and craft beer industries.
According to Navistar, due to the latest improvements to the A26 (2021 greenhouse gas) engine, the engine now has an additional 4% fuel economy advantage compared to the A26 engine at launch, achieved through engine design and system updates. This latest version of the International A26 is made of a MAN D26 engine crankcase, which can produce up to 515 horsepower and 1,850 pound-feet of power. The torque.
Navistar outlined the biggest improvements of the A26 engine.
Combustion enhancement: The compression ratio is increased from 18.5:1 to 20.5:1, providing higher combustion efficiency and the maximum fuel injection pressure from the 2500 bar high-pressure common rail fuel system.
Optimized engine temperature control: The design of the cylinder head coolant passage helps reduce parasitic losses at the water pump, and the increased variable water pump provides a more optimized operating time than a constant "on".
Air management system update: Optimized exhaust gas recirculation (EGR) cooler and intake throttle can produce more efficient charge air flow. In addition, the variable geometry turbocharger can provide the required charge air pressure in a variety of engine speed, load and height ranges.
Reduce engine speed without affecting power: a higher HP output can provide maximum power when needed, while running at a lower RPM can optimize the amount of fuel consumed during operation.
Navistar pointed out that when used with the International LT series update, fuel efficiency has increased by 6%. These design and system updates include more optimized engine and gearbox calibration with Eaton Cummins Endurant automatic manual transmission, direct drive 2.15 ratio, and aerodynamic improvements to the transaxle wheels and wheel coverings on the chassis.
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