What mechanism is used to power the Supercharger in Top Alcohol drar racing vehicles?
Top Alcohol:  In Top Alcohol Dragster, the cars used supercharged ("blown") engines, burning alcohol (methanol). Supercharger: A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine.
an air compressor that increases the pressure or density of air supplied to an internal combustion engine