The 5.9 Cummins and the 7.3 Powerstroke diesel engines are both popular choices for school buses. Here are some key differences between the two:
Size and power: The 5.9 Cummins is a 6-cylinder engine with a displacement of 5.9 liters, while the 7.3 Powerstroke is an 8-cylinder engine with a displacement of 7.3 liters. The 7.3 Powerstroke is generally more powerful than the 5.9 Cummins, with higher horsepower and torque ratings.
Fuel efficiency: The 5.9 Cummins is generally more fuel-efficient than the 7.3 Powerstroke, due in part to its smaller size and lower power output.
Reliability: Both engines are known for their reliability and durability. However, some drivers and mechanics prefer the 5.9 Cummins for its simpler design and ease of maintenance.
Availability of parts: Parts for both engines are readily available, but some drivers and mechanics may prefer one engine over the other based on the availability of parts in their area.
Noise and vibration: The 5.9 Cummins is generally considered to be quieter and smoother than the 7.3 Powerstroke, which can be noisy and produce more vibrations.
Ultimately, the choice between the 5.9 Cummins and the 7.3 Powerstroke will depend on your specific needs and preferences. Both engines are capable of powering school buses and providing reliable transportation, but each has its own strengths and weaknesses. It's important to do your research and consider all factors before making a decision.