I've only heard of it on small displacement engine. Like the Japan only 660cc micro cars. But it's not that impressive because those engine/cars are only limited to like 65hp max.

You do get a nice flat torque curve but not much else.

Spanky: I think you mean positive displacement roots type S/C? versus centrifugal? or maybe I have that backwards :dunno:

roots type:

centrifugal type looks like the compressor half of a typical turbo setup.


but to me there are better ways of increasing the low end before the bigger turbo comes up to boost. such as a N2O or increasing the displacement :chuckles: