Internal combustion engine disposition

Claim 2

Internal combustion engine structure comprising a one-piece cylinder-block and crankcase casting with integral cylinder-head, of light alloy, and incorporating valve guides, induction ports, exhaust ports, spark plug wells, cooling-water chambers open at the upper portion of the casting around the valve seatings and closed by a cover, said cooling-water chambers extending axially around the cylinders and outside the areas corresponding to the induction and exhaust ports and also to the spark-plug wells, said casting further comprising in said areas around said cylinders a wall portion provided with cooling fins.

Claim 3

Internal combustion engine structure according to claim 1, wherein said cooling-water chambers of said cylinder-block and crankcase casting communicate with a lower inlet header extending in said casting on one side of the cylinders, and that comunication passages are provided between said chambers and formed between the cylinders, by means of holes formed to this end through one of the side walls and adapted to be sealed by suitable plug means.

Claim 4

Internal combustion engine structure according to claim 1, wherein said cylinder-block and crankcase casting constitutes by itself one portion of the induction manifold in the form of a conduit extending across said induction ports.

Claim 5

Internal combustion engine structure according to claim 1, wherein the cylinder-block cover is adapted to support the camshaft and the valve gears, said cover being assembled to said cylinder-block and crankcase casting along a joint plane above which it comprises, around valve seatings complementary to those of said casting, water chambers communicating with other water chambers formed in said cylinder-block and crankcase casting and also with a water outlet port formed in said cover on the said side as same valve seatings.

Claim 6

Internal combustion engine structure according to claim 1, wherein said one-piece cylinder-block and crankshaft casting is made of high-silicon aluminium or light alloy.

Claim 7

Internal combustion engine structure comprising a one-piece cylinder-block and crankcase casting with integral cylinder-head, of light alloy, and incorporating value guides, induction ports, exhaust ports, spark plug wells, cooling-water chambers open at the upper portion of the casting around the valve seatings and closed by a cover, said cooling-water chambers extending axially around the cylinders and outside the areas corresponding to the induction and exhaust ports and also to the spark-plug wells, said casting further comprising in said areas around said cylinders a wall portion provided with cooling fins, and further comprising at the lower portion of said one-piece cylinder-block and crankcase casting, a complementary crankcase component for the upper half-bearings of the crankshaft, said crankcase component being secured to said cylinder-block by means of bolts also adapted to fasten in position the caps of said bearings, weight-reducing cavities being provided between said casting and said complementary crankcase component.

Claim 8

Internal combustion engine structure comprising a one-piece cylinder-block and crankcase casting with integral cylinder-head, of light alloy, and incorporating value guides, induction ports, exhaust ports, spark plug wells, cooling-water chambers open at the upper portion of the casting around the valve seatings and closed by a cover, said cooling-water chambers extending axially around the cylinders and outside the areas corresponding to the induction and exhaust ports and also to the spark-plug wells, said casting further comprising in said areas around said cylinders a wall portion provided with cooling fins, and further comprising at the lower portion of said one-piece cylinder-block and crankcase casting, a complementary crankcase component for the upper half-bearings of the crankshaft, said crankcase component being secured to said cylinder-block by means of bolts also adapted to fasten in position the caps of said bearings, weight-reducing cavities being provided between said casting and said complementary crankcase component.