Diesel engines almost never need to be replaced during the life of a school bus. Unlike many alternative fuel engines, diesel engines don't need to be upfitted or replaced multiple times during their lifecycle, saving time, money and hassles.
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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.
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.
Buses and trucks generally use a 6 cylinder in-line diesel engine and using a turbocharger can improve the thermal efficiency of the engine and also can control the emission level to an extent. Though old buses are not equipped with turbocharger the buses manufactured nowadays are fitted with a turbocharger.
Reading Buses' Bus Hound was recorded doing a lap speed of 76.785mph (123.57km/h) at Bedford's Millbrook Proving Ground. It runs on biomethane compressed natural gas and is painted black and white like a Friesian cow. It normally carries passengers around Reading. The UK Timing Association confirmed the new record.
TfL continues to publish average bus speed information in its budget and annual report. The target for average bus speed in 2020/21 is 9.3mph, compared with a 2019/20 forecast of 9.2 mph.