The CE Series is built to be on time, every time

CE Series Powered by Gasoline


Based on feedback from our customers, we set out to develop a gasoline powered, commercial-grade V8 engine purpose-built for school buses that features similar power and performance to diesel. This means immediate acceleration from a complete stop and greater hill climbing capability. In other words: a no compromise solution for school districts everywhere.

Purpose-Built for the School Bus Industry

PSI’s medium-duty 8.8L naturally aspirated engine is available with a gasoline power unit, developed from the block up to be reliable and durable.


PSI 8.8L Specifications

Rated Horsepower

  • 265 @ 2600 RPM

    • @1000 RPM: 95 hp
    • @2000 RPM: 202 hp

Rated Torque

  • 548 ft-lb @ 1800 RPM

    • @1000 RPM 500 lb-ft
    • @2000 RPM 530 lb-ft


  • 8.8L


  • 4.35" x 4.5"

Compression Ratio

  • 9.1:1


  • Heavy-Duty Engine 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 engines
  • Best-in-Class Serviceability
    • Both the engine compartment and engine provide best-in-class accessibility for easy maintenance
    • Gasoline and Propane versions use same engine block providing an easy solution for mechanics and drivers of mixed fleets
    • Includes the industry’s only one-stop warranty for gasoline vehicles
  • Allison Transmission
    • 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
    • Same transmission used across all IC Bus powertrains for ease of maintenance