Trains and Railroads
Why do diesel multiple unit trains make so much noise whilst in motion?
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Asked in Train Travel
How do trains turn around on a single track?
The same situation arises whether it is a single or a double track. Electric and Diesel engines have a driver's cabin at each end so the train doesn't need to turn, the driver simply sits at whichever end is going forward. Steam trains had a Turntable at each the end of the line and a section of track for the carriages to sit on whilst the Locomotive was turned around. Many passenger trains either have a second engine at the other end, or a driving cab at the end of the last carriage. That way the train can travel equally in either direction. Modern passenger trains are often 'multiple units'. There is no separate engine, the motors (electric or diesel) are spread along the underside of the train attached to the wheels, and there is a driving cab at either end. The train is symmetrical. High speed trains are like this (TGV etc.)
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How does diesel fuel ignite in the engine?
The engine's pistons compress the fuel (an air and diesel oil mixture) in the cylinders and the heat generated by that compression causes the fuel to ignite. A longer answer Diesel engines ignite their fuel solely by means of compression: whilst spark plugs are used to ignite the gasoline fuel and air mixture in gasoline engines, in diesel engines the diesel oil and air mixture is compressed to a very much higher degree, which causes a lot of heat. The resulting very high temperature causes the fuel to self-ignite.
Asked in Cars & Vehicles
Why is diesel gas better than regular gas?
Diesel gas gives more mileage (miles per gallon) than regular gasoline. You must, of course, have a vehicle that has a diesel engine because diesel fuel cannot be used in an engine that runs on regular gas! Depending on local government taxation policies, in some countries diesel is cheaper to buy than regular gas whilst in other countries it is more expensive! Diesel fuel is thicker and "stickier" than regular gas so, if a vehicle's fuel system ever needs cleaning - fuel tank, fuel lines, fuel pumps and fuel injectors - it is a more difficult and expensive job to do on a diesel vehicle.
Asked in Science
Can an object be at rest as well in motion at the same time?
An object can be at rest relative to a second object whilst in motion relative to a third object. For example, if you sit still then relative to the Earth you are at rest. However the Earth is both spinning on its axis and travelling around the Sun, so relative to an observer in space you are in motion. Einstein showed us that all such concepts are relative.
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What oil filter do you need for a Ford Fiesta diesel?
On the Diesel Fiesta you need the 5W-30 Ford Motorcraft oil, or any other good brand of fully synthetic motor oil with the 5W-30 specs. You need the correct filter for your model of diesel engine Fiesta. The old 1.8 straight diesel used a metal cannister filter, whilst the later Tdci Duratorq engines have a paper element filter in a plastic housing (looks like a bomb or a fat plastic bottle with a hexagon cap) on the side of the engine block.