Cylinder-head for an internal combustion engine

Abstract From the Canadian patent

The material of which a cylinder-head is made must meet two conflicting requirements. The web-part between the gas-exchange valves must be highly ductile whereas the sealing, surface between the cylinder-head and barrel must have high resistance to creep under pressure at high temperatures. As the power-output of internal combustion engines increases leading to increased thermal stressing of the cylinder-heads known heat resistant cast aluminum alloys can no longer meet these requirements. Known reinforcement with inserts made of a material more resistant to heat has the disadvantage that the joint between the parts loosens in time as a result of differential expansion of the different …