| 摘要 |
PURPOSE: An intake port structure is provided to achieve improved engine output by supplying sufficient amount of air to the engine through first and second ports when the engine rotates at a high output. CONSTITUTION: An intake port comprises a cylindrical main body(10) for connection with an intake manifold. A first port(11) and a second port(12) are branched off from an output end of the main body. Each port has a valve insertion hole(13) formed on the top surface of each port so as to allow an intake valve to be mounted in the valve insertion hole. The first port and the second port have cross sections in the region where the valve insertion hole is formed, wherein the cross sections are C-shaped. The first port and the second port in the region where the valve insertion hole is formed, have independent fuel-air mixture flow channels which are not connected with each other.
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