The new BS 50-4s and BS 60-4s rammers feature low-oil shut off. This patent-pending system uses an electronic sensor incorporated into the engine. The engine is also specially designed to withstand the vibration of a rammer application. The advanced air filtration system and carburetor manifold have also been specially designed. The BS 50-4s hits with 2645 pounds per blow at 680 blows per minute; the BS 60-4s hits with 2975 pounds per blow at 680 blows per minute. Wacker Corp., 800-770-0957, www.wackergroup.com.