by 
The Curious Bag
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Engine displacement is a term used to indicate the size of an engine. It can be expressed in liters, cubic centimeters or cubic inches, such as 3.5L (liters), 350 ci (cubic inches) or 1,200 cc (cubic centimeters). In general, the larger the engine, the more powerful it is.
Function
When an engine is running it draws air into the cylinders and mixes it with fuel to create a controlled explosion.
Measuring Air
Displacement is the measurement of how much air an engine draws in during the combustion phase of one complete revolution. This number is expressed in terms of a cubic volume of air.
Power
Displacement is directly related to how much power an engine has. Everything else being equal a 3.5 L engine will be much more powerful than a 2.5L engine. In other words, the more air and fuel that can be mixed and fired in each cylinder, the more powerful the resulting explosions and the more powerful the engine.
Mileage
Engines that draw in more air must also draw in more fuel, so engine displacement also has a direct impact on fuel economy.
Uses of Displacement
Displacement is used as a rough measure of power for all sorts of engines, including automobile engines weed eaters, chainsaws, lawn mowers, motorcycles and other engines. Engine size in these type of engines are typically expressed in cubic centimeters, such as in a Kawasaki Ninja 650r, which has a 649 cc engine.
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