Some alternatively fueled engines like propane or gasoline may need to be replaced two to three times during the normal lifecycle of a school bus. Clean-diesel engines, on the other hand, are built to last 15-20 years.
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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.
Benefits of public transportyou don't have to worry about finding a parking space. it reduces congestion in towns and cities. using public transport is cheaper than owning and operating a car. no more sitting in traffic jams in rush hour thanks to bus lanes and other bus priority measures.
Propulsion. The most common power source since the 1920s has been the diesel engine. Early buses, known as trolleybuses, were powered by electricity supplied from overhead lines.
Public transportation gets people where they're going while emitting far fewer climate-warming greenhouse gases than private cars. The reason is simple efficiency: while cars usually carry just one or two people at a time, a bus can carry 50 or more, and a train in a large city may carry thousands.
Public transportation gets people where they're going while emitting far fewer climate-warming greenhouse gases than private cars. The reason is simple efficiency: while cars usually carry just one or two people at a time, a bus can carry 50 or more, and a train in a large city may carry thousands.
Transit buses are a LITTLE more fuel-efficient, but not as much as many people might think. A car (24.2 MPG) with the national-average of 1.5 passengers gets 36.3 PPMG (Passenger Miles per Gallon). A transit bus (3.3 MPG) with a national average load (9.1 passengers) gets 30 PPMG.
Diesel engine speedsThere are several general types of diesel engines and those are high speed or low speed design. The high HP/displacement engines are usually of the low speed design, at a governored speed of 2150-2350RPM. The high speed diesels like to rev up to as much as 3600RPM.