The Detroit DD8 is a 7.7L in-line 6-cylinder medium-range engine that boasts a horsepower range of 260-300HP and a torque range of 660–860 foot-pounds for the Saf-T-Liner HDX.
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(Jan. 19, 2021) — This spring, Blue Bird will begin production of its propane and gasoline Vision school buses integrating Ford's all-new 7.3L V8 engine and a purpose-built fuel system designed specifically for school-bus application.
School busses are based on diesel or gasoline internal combustion engines for the most part and have 12VDC (or maybe 24VDC as used in larger trucks) systems for starter and lighting.
1. Easy Entry for Passengers. A front engine has the center of the bus mostly occupied, but there is no block with a rear engine. This allows for an easier flow of traffic for passengers.
Over the long haul, newer diesel engines will last 15-20 years in a fleet, while a gasoline engine may need to be replaced once or even twice during the life of a school bus. “All of these are important for fleet managers to stop and consider when choosing a new school bus,” says Hedgecock.
If you're short on time, here's a quick answer to your question: school buses are regulated by states to not exceed 55-65 mph depending on the type of bus. Their governors generally limit maximum speed to between 65-78 mph. In this comprehensive guide, we'll cover everything you need to know about school bus speeds.