Page "Forced induction" Paragraph 9
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Superchargers have almost no lag time to build pressure because the compressor is always spinning proportionally to the engine speed.
This is considered positive displacement because the pressure is not made inside, as in a piston compressor ( also known as reciprocating compressor ).
This compressor has the advantage of being able to produce the same boost pressure at every engine speed.
Ultimately this depends on the flow characteristics of the entire engine but the same volume of air is pumped into the engine for every revolution of the engine.
They are not as common as turbochargers because they use the torque produced from the engine to operate.
A centrifugal compressor is commonly used because it is compact and easier to use an intercooler with.
A screw type supercharger uses rotary screw compressor with multiple screws to compress the air between the screws before releasing it to the engine.
It generally produces a cooler air output and has a flatter boost curve then a centrifugal supercharger.
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