Valve system having improved opening and breathing characteristics for internal combustion engines

摘要

An improved poppet valve (200) provides quick opening characteristic that allows for easy breathing while avoiding the refrigerating loss of heat associated with conventional poppet valves. The improved poppet valve includes a valve stem (108), a valve head (206) coupled to the valve stem wherein the valve head further includes a substantially cylindrical portion (204). This substantially cylindrical portion (204) slideably mates with a corresponding substantially cylindrical mating surface (202) that defines a part of the aperture of the port (112) in a housing -- typically, an inlet or exhaust port of an internal combustion engine. The substantially cylindrical portion (204) makes a seal with the substantially cylindrical mating surface (202) of the port such that gases that flow through the port do not see an effective opening to either enter or exit the cylinder until the substantially cylindrical portion (204) has cleared the substantially cylindrical mating surface (202) of the port. In another aspect of the present invention, the improved poppet valve employs an adjustable valve timing shedule and valve actuation that compensates for dynamic load differentials as well as providing for altitude compensation.