The forged steel crankshaft and connecting rods were also carried over from the 12 valve Cummins engine due to their durability. The existing cast-iron block and cylinder head were already proven commodities and were more than capable of handling the increase in power. Maintaining the legendary Cummins level of reliability was another major focus when redesigning the 5.9L.

Incorporating 4 valves per cylinder not only gave the 5.9L Cummins more power but also provided enhanced throttle response and a broader torque curve. The combination of increased valves, as well as an enhanced fuel system, significantly increased airflow, provide more precise fueling, all while delivering more horsepower and torque. The major upgrade added to the 5.9L Cummins midway thru 1998 (or 1998.5 as it is often referred to) was doubling the number of valves in the cylinder head from 2 valves to 4 valves per cylinder.

This ultimately helped lead to the introduction of the 24 valve 5.9L Cummins. Leading the field and competition in horsepower and torque has played an important role throughout the history of the automotive industry, none more so than the ultra-competitive diesel marketplace. Ram 2500/3500 trucks maintained their signature body style with some slight cosmetic changes but received a new modified version of the 5.9L 24V Cummins engine. Posted on Octoby Jeremy_XDP 0 History/General Infoįor the second half of the 1998 model year, Dodge made some major mechanical changes to Cummins-powered trucks. Buyers Guide, Cummins 1998.5-2002 Dodge 5.9L 24V Cummins Buyer’s Guide

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