Engine block with unitarily cast exhaust gas passages and water jacket cavity

Abstract From the Canadian patent

Disclosed herein is a method of fabricating an integrally cast engine block including a plurality of cylinders, exhaust passage portions which respectively extend from the cylinders and which form portions of exhaust gas passages of equal length, and a water jacket cavity including respective water jacket cavity portions in encircling relation to the exhaust passage portions which, method comprises the steps of providing a mold cavity which defines the exterior surface of the block locating one or more disposable cores in the mold cavity so as to provide for the exhaust passage portions and for the water jacket cavity filling the, mold cavity with molten metal to provide a unitarily cast …