While the VP44 physically resembled the VE pump from about 10 years earlier, the VP44 featured all electronic controls for fueling. The main difference in valvetrain of the 24-valve was the addition of a rocker bridge which allowed one rocker to actuate two valves at the same time.
On top of each lobe was a single flat tappet, one pushrod, and a single rocker arm. Since the engine is so similar to earlier models, the camshaft only had one intake and exhaust lobe per cylinder. By using a pair of smaller valves instead of a larger single valve, the exhaust and intake ports could flow more total air into and out of the combustion chamber which means better power and torque throughout the entire RPM range. The key differences were in the cylinder head and injection pump. The new engine shared the same displacement, pretty much the same block, rotating assembly, front accessory drive, and more. Rather than a clean sheet re-design, the 24-valve is just an evolution of the 12-valve that preceded it. The combination of the higher compression and a slightly modified calibration is what was responsible for the increase in power, although the difference between the SO and HO engines was only 10hp and 45 pounds of torque. It’s interesting to note the standard output 24-valve had a compression ratio of 16.3:1, but the HO (high output) versions were quite a bit higher at 17.2:1.
#2001 24 valve 5.9 cummins rear main seal manual#
By 2002, if you chose the High Output manual transmission version of the engine, you’d have 245hp and 505 pounds of torque at your disposal. For its first year, the automatic transmission version of the 24-valve was rated at the same amount of power and slightly less torque, but if you purchased a manual transmission truck, you got a little more oomph.
The most powerful 12-valve in a pickup truck application was rated at 215hp and 440 pounds of torque. In place of the P-pump was a new, electronically controlled injection pump from Bosch called the VP44, and the cylinder head now contained twice as many valves as before, giving the 1998.5 to 2002 Cummins ISB its nickname, the 24-valve. For Cummins, that day happened midway through the 1998 model year when the last P7100 12-valve trucks rolled off the assembly line. However, just like the typewriter, there would come a day when the older mechanical technology would be phased out in favor of a newer, electronic alternative. The VE and P7100 trucks were simple to work on, very reliable, and with a few simple tweaks to the pump, could deliver a huge increase in power over stock. 2016 - 2022 Canyon/Colorado 2.8L Duramaxįrom 1989 until 1998, the Dodge Ram pickups powered by the 5.9-liter Cummins 12-valve engine had a mechanical injection pump.
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