Wacker builds a broad range of vibratory rammers that reflects various engine designs: conventional two-stroke-cycle (two-cycle); two-cycle with oil injection; four-stroke-cycle (four-cycle); and diesel This range of models provides operating weights from 129 to 183 pounds, and horsepower ratings from 3.1 to 4.1. Maximum percussion rates vary from 680 to 715 blows per minute (bpm).