Patent ID: 6945211
Filing Date: 2005-09-20
Classification: F02F

Abstract:
1. A cylinder head of an internal combustion engine in which a plug hole for mounting an ignition plug is formed alone a cylinder axis, and an intake port and an exhaust port are respectively formed at both sides of the plug hole while sandwiching the cylinder axis therebetween, the cylinder head further including an intake valve which opens or closes the intake port and an exhaust valve which opens or closes the exhaust port, wherein a cross-sectional shape of a flow passage of an outlet of the exhaust port is an oval shape extending in the horizontal direction and a water drain hole of the plug hole is formed below the exhaust port, and an outlet of the water drain hole of the plug hole opens inside a circle which circumscribes an outer periphery of a gasket provided to the outlet of the exhaust port.