I have been running an enclosed rotor in the P1 processor for wheat, milo, and soybeans. Am very, very satisfied with its performance. I am using standard double-stacked helicals but have installed the transistion kit. The bottom helicals on the sep. side are left out. The rotor staying in balance is a major improvement but the enclosed rotor weight is 640 n more than standard rotor. This extra weight keeps things a turning even when a big bunch comes in...it just keeps on a going and going......