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  • Capacity: 29-78
  • Engine: Cummins B6.7
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  • Capacity: 66-90
  • Engine: Cummins L9
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  • Capacity: 52
  • Engine: Cummins B6.7
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  • Capacity: 56
  • Engine: Cummins L9
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  • Engine: Cummins B6.7
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FIVE REASONS WHY THE PSI 8.8L IS THE BEST IN ITS CLASS

Purpose-built for the school bus industry, PSI's medium-duty 8.8L naturally aspired engine is available with a gasoline or propane power unit developed from the block up to be reliable and durable. 

1. HEAVY-DUTY DESIGN

  • Forged, induction-hardened crankshaft
  • Forged rods and pistons
  • Oil bath lubrication provides piston cooling
  • Low engine-speed design produces less noise, heat and wear than competitor gasoline and propane engines

2. SERVICEABLE

  • Both the engine compartment and engine provide best-in-class accessibility for easy maintenance
  • Includes the industry’s only one-stop warranty for gasoline and propane vehicles
  • Allison Transmission 7-year / Unlimited mileage warranty Industry's broadest, most capable parts distribution and dealer network

3. ALLISON TRANSMISSIONS

  • Shorter, sturdier shaft has increased durability vs. Ford
  • Over 44% more clutch material vs. Ford so it holds gear and lasts longer in the toughest operation
  • Heavy-duty park pawl better secures vehicle

4. POWER OF CHOICE

  • Gasoline and Propane versions use same engine block providing an easy solution for mechanics and drivers of mixed fleets
  • Gasoline and Propane make cold weather startup easy
  • Upfront cost is lower for gasoline compared to diesel

5. REAL-WORLD PERFORMANCE

  • Low engine speed design drives like a diesel, with no compromise on engine power and reliability
  • More low-rpm horsepower is available versus Ford
  • Higher torque rating at all rpms

SPEC COMPARISON

How does the PSI 8.8L compare to the Ford 6.8L V-10 on paper? Download the full comparison to find out.
See the Specs
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