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1994 & 1995 Ram / Cummins Horsepower and Torque Curves
Manual Transmission
Compression Ratio: 17.5:1 Power: 175 bhp @ 2500 rpm Torque: 420 lb-ft @ 1500 rpm BHP/Liter: 29.7 Max. Engine Speed (Governed Speed*) : 2700 rpm Max. No Load High Idle Engine Speed: 3000 RPM
Automatic Transmission
Compression Ratio: 17.5:1 Power: 160 bhp @ 2500 rpm Torque: 400 lb-ft @ 1500 rpm BHP/Liter: 27.1 Max. Engine Speed (Governed Speed*) : 2700 rpm Max. No Load High Idle Engine Speed: 3000 RPM

  HP curves from the 1994 Dodge sales flier

*The "governed speed" is the highest speed which produces useable power. Above the governed speed, engine power drops VERY quickly. Other interesting engine speeds:

• Destructive torsional harmonic resonance occurs at 4100 RPM
• Crank and rods fail at 5400 RPM (if you make it through 4100 RPM)

• Engine: 5.9-Liter, OHV, Diesel Six-Cylinder
• Type & Description: Six cylinder, in line, liquid cooled, turbocharged, intercooled
• Displacement: 359 cu. in. (5.9 L)
• Bore x Stroke: 4.02 x 4.72 (102.1 x 119.9)
• Valve System: OHV, 12 valves, solid sliding tappet lifter/followers
• Valve Adjustment (engine cold)
  • Intake = 0.010"        Exhaust = 0.020"
  • Adjustment interval - 24,000 miles
• Fuel Injection: Bosch P7100 High-pressure direct injection, mechanical
• Fuel Pressure: 18-24 psi at idle, 28-36 at 2000 rpm with no load.
• Max Fuel Pressure drop accross filter: 5 psi
• Max allowable fuel return line restriction : 20.4" Hg
• Maximum Inlet Restriction to fuel transfer pump: 4" Hg
• Construction: Cast iron block & head
• Fuel Requirement: Diesel #1 or #2
• Oil Capacity 1994: 10 qt. (9.5 L) with filter
• 11 quarts  using Cummins p/n 3928740  or Dodge p/n 4796874  dipstick
• 11 qts by marking the dipstick  1 3/16" above the "ADD" mark
• Oil Capacity 1995: 11 qt. (10.4 L) with filter
• Oil Flow Rate: 20 GPM
• Minimum Oil Pressure @ Idle: 10 psi
• Minimum Oil Pressure @ Rated: 30 psi
• Regulated Oil Pressure: 65 psi
• Oil Filter Bypass Diff. Pressure: 20 psi
• Coolant Capacity: 24 qt. (22.7 L)
• Emission Controls: Engine modifications, oxidation catalyst (after 1/1/94)
• Alternator: 120 A
• Battery: Maintenance-free, dual 750 CCA

*The "governed speed" is the highest speed that produces useable power. Above the governed speed, engine power drops VERY quickly. Other interesting engine speeds:

• Destructive torsional harmonic resonance occurs at 4100 RPM
• Crank and rods fail at 5400 RPM (if you make it through 4100 RPM)

• Diesel no 2 minimum cetane rating
• 40 for temp above 32 degrees F
• 45 for temp below 32 degrees F
• 45 with prolonged heavy loads (towing, max GVWR, etc)
• Acceptable emergency alternative fuels for 1994 & later 12 Valve trucks:
• #1 and #2 Diesel
• 1K and 2K Kerosene
• Jet -A,  Jet A-1,  JP-5,  JP-8
• NOT Acceptable
• Jet-B,  JP-4,  Cite

Maximim Allowable Exhaust Restriction: 6" Hg
Maximum Intake Restriction  25" H2O

The stock 12 cm housing on 94+ engines is OK up to about 240 HP, beyond which the small housing restricts the exhaust and raises EGT. A 16 cm housing provides enough low speed boost for an enhanced engine, and the exhaust runs cooler at high speed.

Thanks to CJ Johansson for assisting with the Fuel heater/strainer/wiring/gasket part numbers.

Last update to this page: April 11, 2003