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The engine is mounted next to the driver inside the bus (front-engine/"FE"), in the rear of the bus behind the rearmost seats (rear-engine/"RE"), or in between the axles underneath the floor ("amidship" or "mid-engine") The last mid-engine Type D school buses were manufactured when Crown Coach ceased operations in 1991.
It is currently the largest straight-six engine produced for a light duty truck or school bus. It produces 350 hp (261 kW; 355 PS) and 650 lb⋅ft (881 N⋅m) in the 2007.5 and newer Dodge 2500/3500 pickup trucks with the Chrysler-built six-speed 68RFE automatic transmission built at the Kokomo Transmission plant in Kokomo, Indiana .
An illustration of several key components in a typical four-stroke engine. For a four-stroke engine, key parts of the engine include the crankshaft (purple), connecting rod (orange), one or more camshafts (red and blue), and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system.
Thomas offered its transit-style buses on a wide variety of chassis in comparison to other manufacturers (changing between Dodge, Ford, GMC, International Harvester, and Volvo). In contrast, Blue Bird, then the largest school bus manufacturer in the United States, manufactured its own chassis (as did West Coast manufacturer Gillig).
The Freightliner FS-65 is a cowled school bus chassis (conventional style) that was manufactured by Freightliner from 1997 to 2006. Derived from the Freightliner FL-Series medium-duty trucks, the FS-65 was produced primarily for school bus applications, though commercial-use buses and cutaway-cab buses were also built using the FS-65 chassis.
The division offered its conventional school bus chassis with Chevrolet-produced engines, including the 250 inline-6 (replaced by the 292 inline-6), 366 V8, and 427 V8. [1] In both Chevrolet and GMC school buses, the Allison AT475 3-speed automatic transmission became an option in 1971 with single or two-speed rear axles.
While primarily used for school bus applications in the United States and Canada, the chassis was exported worldwide to manufacturers to construct bus bodies for various uses. Prior to 1969, Lincoln-Mercury dealers in Canada marketed the B series as part of the Mercury M-series truck line. At the time, rural Canadian communities were serviced ...
The rear-mounted emergency exit door is a design feature adopted from horse-drawn wagons (the entrance was rear-mounted to avoid disturbing the horses); in rear-engine school buses, the door is replaced by an exit window mounted above the engine compartment (supplemented by a side-mounted exit door).