In this update I'll show off my lost foam cast V4 2 stroke engines front crank case half. I'll explain some of the process and look at the casting in depth and explain what went wrong. The foam was machined on my CNC mill using fusion 360 and Mach 3 The foam is extruded polystyrene or XPS The material is similar to LM25 and was virgin casting stock the refractory is Gib 4+ The wax is fiberglass mold filleting wax Subscribe make sure to like the video