Low weight reciprocating engine

Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail

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Details

123 52MC, 123 4172, 123 4179, 123 55UE, F02B 7522

Patent

active

042122813

ABSTRACT:
An internal combustion V-8 engine is disclosed having an aluminum semi-permanent mold head cast by a low-pressure die-cast process and an iron block cast by the evaporative casting method. The block and head have controlled thickness walls throughout to optimally lower the metal/working volume ratio of the engine. The block employs barrel cylinder walls cast integrally and unsupported except at the barrel ends and at a siamese connection between adjacent barrels; the barrels are maintained under a predetermined level of compression to eliminate fatigue failure and suppress sound. The block is sand cast and the head is totally formed with a three piece die and one sand core cluster, except for one passage which is drilled subsequent to casting. The engine is reduced in weight by at least 20% over conventional comparable engines; torque and horsepower is improved even though the cooling system capacity has been reduced to less than half that of a conventional cooling system.

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patent: 4124977 (1978-11-01), Sakurai

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