Low-Emissions, Cost-Efficient and Ultra-Reliable.

School bus fleets, shuttle bus operators, medium-duty truck owners and managers of all types of vocational vehicles can now spec a natural gas engine perfectly sized for their equipment. For applications up to 33,000 lb. GVW, the Cummins Westport ISB6.7 G combines the strength of a proven diesel engine block and components with innovative combustion technology from the undisputed leader in the natural gas engine industry. Rated at up to 240 hp (179 kW) with 560 lb-ft (759 N•m) of peak torque, and available with automatic transmissions, the ISB6.7 G has the power to outperform gasoline engines of similar displacement while delivering better fuel efficiency and longer engine life.