Log Splitter Plan Build a hydraulic log splitter. Project uses mostly hot rolled steel and requires welding. Obtain the materials from local supply houses. Mechanicals such as a 5 HP gas engine, hydraulic pump and hoses, control valve and cylinder are often available at local supply shops or by mail from many suppliers Logs are split in seconds as the engine drives the oil pump which feeds to the cylinder, driving the ram into the log which is spilt by the wedge. Ram movement ram is controlled by operator using control valve handle. Perfect for the homeowner, it is compact (under 6 feet long x 3 feet wide) yet does heavy duty work. The wedge is 6" high. Detailed plan.