These high-pressure mechanical injectors were redesigned to inject fuel into the center of the piston. While the injection pump on the 24 valve Cummins is electric, the injectors remained mechanical. With an integrated ECU the Bosch VP44 injection pump pressurizes fuel, controls injection timing, and monitors fuel flow. The mechanical injection pump was replaced with a Bosch VP44 electronic pump. To increase performance components in the fuel system were upgraded. The forged-steel crankshaft and connecting rods were carried over from the 12 valve Cummins engine due to their durability and longevity. The upgraded cast-iron 24 valve cylinder head significantly improved coolant flow in the engine. Utilizing 4 valves per cylinder gave the 5.9L Cummins enhanced throttle response and a broader torque curve. The cast-iron block and cylinder head proved they could handle increased power. Maintaining durability was another major focus when redesigning the 5.9L Cummins. Paired with the new 24 valve Cummins engine were new drivetrain components to further improve overall performance. The combination of increased valves and an enhanced fuel system would significantly increase airflow, and provide more precise fueling, all while delivering more horsepower and torque. One key upgrade to the 5.9L Cummins was doubling the number of valves in the cylinder head to 4 valves per cylinder. Improving horsepower and torque is always one of the main objectives for competing diesel engine manufacturers, which influenced the production of the 24 valve 5.9L Cummins. These trucks would maintain their signature body styles but would be powered by a modified version of the 5.9L Cummins engine. For the second half of the 1998 production year Cummins made some major mechanical changes to the 2nd generation Cummins-powered trucks.
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