International Truck Engine Specificationsby Susan Dorling
At the core of the ProStar and other International brand heavy-duty, Class 8 commercial trucks is a Navistar Maxxforce big-bore diesel engine. Introduced in 2008, the Maxxforce 11 and Maxxforce 13 are designed specifically for International brand heavy trucks. Whether barreling down the Interstate highway or lumbering along in city traffic, the Maxxforce diesel reaches peak torque at 1,000 rpm; offering better response for earlier up-shifts and better lugging for fewer downshifts.
Maxxforce 11 and Maxxforce 13 Performance
The Maxxforce 11 and Maxxforce 13 diesel engines are tough, reliable and capable of delivering maximum power and performance, with low noise and vibration for a quiet ride. Dual-staged turbochargers -- intercooler and aftercooler -- and a high-pressure direct injection system maximize the performance of the Maxxforce big-bore engines. The primary turbo responds quickly for fast take-offs while the larger, secondary turbo provides maximum power on steep grades. After achieving peak torque at only 1,000 rpm, the torque holds steady at 1,200 rpm which is lower than most other big-bore engines. The engine is fabricated from compacted graphite iron cylinder block (CG) making it 500 lbs. lighter. Optimal fuel combustion results in better fuel economy and less emissions.
Maxxforce 11 Specs and Dimensions
The Maxxforce 11 is a four-cycle, inline six-cylinder diesel engine with four valves per cylinder, overhead cam actuated. Engine displacement is 641 cubic inches. Bore and stroke are 4.72 inches and 6.10 inches. The compression ratio is 16.5:1. Total dry weight of the engine is 2,400 lbs. Oil capacity is 42 quarts. It is 59 inches long, 37 inches wide and 49 inches high.
Maxxforce 13 Specs and Dimensions
The Maxxforce 13 is a four-cycle, inline six-cylinder diesel engine with four valves per cylinder, overhead cam actuated. Engine displacement is 758 cubic inches. Bore and stroke are 4.96 inches and 6.54 inches. Compression ratio is 16.5:1. Total dry weight of the engine is 2,400 lbs. Oil capacity is 42 quarts. It is 59 inches long, 37 inches wide and 49 inches high.
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