How supercharger works?

Answer 1

They are belt or gear driven air compressors. There are 3 types:

Roots-GMC,Wiend, B&M, Eaton

They basically move more air than the engine can consume, the extra air is compressed in the intake manifold creating boost. Instant boost, not eff. at mid/high boost <12psi. A lot larger than screw type for same power.

Screw superchargers- Whipple, Kenne bell, lysholm - looks similar to a roots but are more efficient than roots and compress air internally. Instant boost good to 25-30psi boost.

Last type is centrifugal- Vortech, procharger, rotex, etc. - mounts to the front of the engine(like a alternator) can use stock manifold, lighter/smaller than the others. They compress air internally. Their boost builds with RPM(example 2psi @ 3000rpms, 4 @4000, 6@5000, 8psi at 6000rpms). Can use air/air inter cooler like a turbocharger, other only have air/water inter coolers avail. Most can run max boost levels comparable to screw type(20-30psi) but some newer larger units can run up to 50psi.

Answer 2

Superchargers raise the pressure of air intake so that more air is forced into the combustion chamber of the engine. In this way it revs faster, consequently increasing the speed of charge.

A better description:

A supercharger creates higher pressure in the air intake. Since in an internal combustion engine, the fuel-to-air ratio is constant, it translates to a larger amount of fuel and air in each power stroke of the engine. More fuel and air creates a more powerful reaction, and therefore greater horsepower. A supercharger is identical to a turbocharger in function. The only difference is where the device gets its power. A supercharger is mechanically driven by the engine (ie: belt, chain, drive-shaft), whereas a turbocharger is powered by the exhaust from the engine.