When Were superchargers invented Australia
http://andyizid405.jigsy.com/entries/general/what-i-wish-i-knew-a-year-ago-about-buy-cheap-whipple-superchargers
The Whipple 2300 screw is much better fit for larger engines or higher rpm. At 1500rpm it quit 50 ft. lbs. to the MP112 (350 ft. lbs. to 400 ft. pounds.) as well as only caught up and crossed over (making more