The new version was designed guided by stricter requirements on Federal emissions regulations. The 6.7L Cummins engine had a high-pressure Common Rail fuel injection system, electronically controlled fuel injection pump, and new equipment for emissions reduction. There are many changes compared to the last generation B5.9 version, but the overall design remains the same. The difference between ISB 5.9 and 6.7 cylinder head is the ISB6.7 head has holes (Sensor Hole Style head) from the air intake plenum side. On top of the block, there is a 24-valve cast iron cylinder head similar to the ISB 5.9. The engine block is still made from cast iron. That increased its displacement to 6.7 liters (408 cubic inches). The 6.7 ISB had an increased cylinder bore (4.21 inches or 106.9 mm) and piston stroke (4.88 inches or 124.0 mm). The market wanted a new engine for medium-duty trucks and buses, and the ISB 6.7 engine became the answer for that. At that moment, it was outdated and depleted the limits of possibilities for improvements in terms of fuel consumption and emissions. Its predecessor, the ISB 5.9, has been produced almost ten years.
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