Shredder Guide High Speed Machinery .
From these early 74inch and 80inch shredders of top and bottom discharge design came the 96inch and 98inch shredders with 4,000 and 5,000 horsepower motors. Diameter and horsepower went up. But the shredders were fundamentally the same, just a little bigger with high production and higher cost. All of the shredders up to 1980 were primarily automobile shredders.