Evaporable foam pattern for casting an engine block of a two-cycle engine

Abstract From the Canadian patent

An evaporable foam pattern to be used in casting a multi-cylinder in-line two-cycle engine block. The assembled pattern, which is substantially identical in shape to the cast metal block includes a, plurality of in-line cylinders each having an end open to the crankcase end of the pattern. Each cylinder includes an exhaust passage that communicates with an exhaust manifold that extends to the exterior of the pattern and each cylinder has at least one longitudinally extending transfer passage. The assembled pattern also includes cooling passages that surround each cylinder, as well as surrounding the exhaust manifold passage. The foam pattern is composed of a plurality of separate foam …