| 摘要 |
A cylinder head of an internal combustion engine is provided with an improved intake port configuration, that improves the efficiency of air intake into a combustion chamber. The engine includes an intake valve which covers an opening of a combustion chamber and which has a valve stem supported by a valve guide. The valve guide is fixed to a curved wall of an intake port leading from a hole in the side of the cylinder head to the intake opening of the combustion chamber. An intake port is configured so that the cross-sectional area thereof reduces with an increasing distance from the intake opening of the combustion chamber, and so that the passage cross-sectional area at a distance equal to about 10% of the total length of the intake port from the intake opening of the combustion chamber is 0.8 times the area of opening of the combustion chamber or smaller.
|
