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). All gas-powered models use Wacker's own engines — either the two-cycle WM 80 or four-cycle WM 90 — which, says the company, are designed specifically for rammer applications. The oil-injection system used on certain two-cycle models is designed to provide a fuel-to-oil ratio of 120:1. Diesel models use a single-cylinder Yanmar engine rated at 4.1 horsepower.
By Walt Moore, Senior Editor | September 28, 2010