PIthonTM 8.0L V8 LPG

Clean, smooth, powerful, quiet . . .

Home » PIthonTM 8.0L V8 LPG

Powertrain Integration designed the PIthonTM 8.0 liter propane autogas powered V8 to fill a huge gap in the medium-duty on-highway market. Rated at 339 HP with 495 lb-ft of torque, the PIthonTM is 50-state certified for over 14,000 lbs GVWR, and validated to 33,000 lbs GVWR. Teamed with Allison 2000 series transmissions and CleanFUEL USA LPI technology, the PIthonTM 8.0L V8 engine package is an unmatched combination.

Writing the next chapter in the legendary history of the GM big block has been a goal since learning GM was sunsetting the 8.1L engine, which Powertrain Integration successfully sold to the school bus market for years.  Now after over four years of rigorous development and testing to OEM standards, the result is the PIthonTM 8.0L V8 LPI, the first of several new alternative fuel engines from PI.

PIthonTM 8.0L V8 LPG – Features & Specs:

Development & Testing
Powertrain Integration subjected PIthonTM to thousands of hours of dynamometer testing for durability and calibration purposes.

PI engineers also journeyed far and wide, high and low to encounter temperature, climate, altitude, load, and grade extremes to ensure PIthonTM stands up to the rigors of heavy duty, real world use.

GVWR /GCWUp to 33,000 lbs.
Engine TypeV-8
Displacement7980 cc (487 CID)
Fuel TypePropane Autogas (LPG)
ValvesPer Cylinder2
Firing Order1 – 8 –7 –2 –6 –5 –4 –3
Horsepower339 HP @ 4100 RPM
Torque495 LB-FT @ 3100 RPM
Bore / Stroke108.49 mm x 107.95 mm (4.27” x 4.25”)
Compression Ratio9.6:1
BlockCast iron, non-siamese bore with full water jackets
Cylinder HeadsCast iron with premium valves for gaseous fuel operation
Intake ManifoldCast aluminum
Exhaust ManifoldsCast stainless steel
CrankshaftForged steel
Connecting RodsForged steel
Main Bearing Caps4 bolt
IgnitionCoil near plug
Throttle ControlElectronic
Max. Engine Speed4600 RPM (no load)
Fuel SystemCleanFUEL USA Liquid Sequential Propane Injection (LPI)
Emission ControlsDual three way catalyst / Positive crankcase ventilation
Engine ControlsSAE J1939 Communications

Not Visible in Photo:

  • Double roller timing chain with hydraulic roller cam and lifters
  • Forged steel crank & connecting rods
  • Coated hypereutectic pistons
Not Visible in Photo:

  • Iron block with full length & circumference water jackets for enhanced cooling.
  • 4-bolt mains
  • Non-siamese cylinder bores
PI Precision Engineered Intake Manifold
CleanFUEL USA Liquid Propane InjectionTM (LPI)
Air Conditioning Options
Brake Options

 Air Brakes


 Hydraulic Brakes


Engine Block Heater option available (not shown)

  • Propane autogas costs much less per gallon equivalent than diesel or gasoline
  • Vehicle weight approximately 500 lbs lighter than comparable diesel
  • Passive emission controls–no DEF, exhaust regens, or DPF service required
  • Reduced total cost of ownership
  • Abundant cab heat & provision for high-flow off board engine coolant
  • Excellent cold weather starting characteristics
  • Mature technology; uses SAE tools
  • Superior driver & customer experience: smooth, quiet operation with responsive power