Intake port for 4-cycle engine

Details Intake port for 4-cycle engine Intake port for 4-cycle engine

2008-09-16

2008-09-16

McMahon, M. (Department: 3747)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder head

C123S184210

Reexamination Certificate

active

11511364

ABSTRACT:
An intake port for a 4-cycle engine includes an intake port base integrally formed with a cylinder head, and an intake port forming member that forms an intake port together with the intake port base. The area of the cross section of the intake port orthogonal to a centerline of the intake port is substantially uniform from an open intake side thereof toward a combustion chamber. The angle made by the centerline of the intake port and an intake valve shaft is larger than 90° from a viewpoint of the intake valve. Thereby, the 4-cycle engine can output high power with the intake port shape, as formed with above mentioned configuration, that reduces intake resistance and that uses simple design molds. More specifically, the engine can reliably prevent condensed fuel from remaining in the intake port to avoid incomplete combustion of gas.

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patent: 52-66105 (1977-06-01), None
patent: 9-170417 (1997-06-01), None
patent: 2000-136762 (2000-05-01), None

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