aust182

Someone asked in the other thread and it was buried. I didn't know whether the SRT is roots type or not. Haven't seen one or even a picture of one. Brian????

EmoDragRacer

it is like a vortech type blower....would that be roots? I know it is centrifugal

Risk3233

I'm no expert on the current labeling of FI units, but I thought "roots" type superchargers were those that were blowers by design (i.e. positive displacement superchargers). Roots are the type used in top fuel drag racing and OEM applications like the Neuspeed in VWs, TRD units in the Solara, the supercharged Buicks (I believe made by Magnusson).

The Vortech and Powerdyne superchargers are centrifugal superchargers. These are the compressor side of turbos spun by a belt attached to the engine. I believe these are the types being used by SRT and Area 51.

If I'm wrong please correct me.

EmoDragRacer

I dont know the tech term for each type of SC... I knonw I am slackin

aust182

This is from the Paxton Supercharger site, if I read this right: roots type is positive displacement and pushes the air through the screws, centrifugal is a pull type (with an impeller like a jet-ski) and sends it into the scroll.

"A roots-type supercharger is a positive displacement supercharger that forces air into an engine with two rotating, intermeshing rotors. A centrifugal supercharger has an impeller that pulls air through the center and directs the air into a scroll using centrifugal force. The scroll resembles a large blow-dryer with a circular shape and a discharge tube. The air is directed in the scroll, pressurized and forced out of the discharge tube and into the engine."

Let me know if this is clear!?!

Risk3233

Correct.

The roots types don't necessarily compress the air intake charge as much as move it from one place to another. The "forcing" comes from the backup of air pressure in the intake tract.

The centrifugal type actually compresses air by the process you described above.