Most of the things I wrote about turbo chargers also apply here. The super chargers also pumps air into the engine, however, the only difference here is that the air pressure depends only from the RPMs of the engine. The basically are two types of superchargers: centrifugal and root. The centrifugal ones are used in with high RPM engines and create pressure only at high RPM’s. These superchargers usually are mounted in front of the engine and look like a huge alternator with a few pipes. The device is pretty simple- a huge fan with small wheels which are rotated by the engine.

The other type is operates with screws. There are 2 big screws which rotate together. I am sure you’ve seen drag cars. Their superchargers can’t fit into the engine department , because of their massive size. These superchargers create pressure at very low RPM. That’s why they are particularly useful for big and powerful engines that don’t need to spin fast. The important thing here is the X/Y ratio. For instance- 7/32. This means that for every 7 RPM that the crank shaft makes, the compressor spins 32 times. Now you know what to think about if you read a 7/32 blower somewhere  : ) .

Normally, centrifugal superchargers are used to add HP to an engine and the second type  is used to add torque.

However, that’s not always the case. The idea behind that statement is that centrifugal ones create pressure only at high RPM (a lot of HP) and the other types of superchargers at low RPM. The pressure is measure by how fast the crank shaft is rotating, the compressor type and the diameter of the roller through which the engine’s belt goes. One of the most popular ways to increase the compressor’s pressure is to install a smaller roller which rotates faster. That’s really simple and effective!

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So, are the compressors the best way to boost the engine’s performance?

They are always spinning, they don’t suffer from the turbo charger’s overheating problem, there isn’t anything that might get clogged, etc. – everything is perfect? Nope, that’s not true. They also have a few flaws. Everything in the compressor is big and rotates slowly. Therefore all parts get heated to really high temperatures. You will need to use an intercoller here, just like you would do if you had a turbo charger installed. These intercoolers also have blow off valves.
by Alexandre Prévot under CC-SA Another problem, typical for the compressors, is the engine’s belt traction. When operating at high pressure the belt might start losing traction. Typically, the belts used in conjunction with superchargers are at least 5 cm wide, preferably 10.The huge belts that you can see mounted on drag cars are exactly what I am talking about.

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