| 摘要 |
<p>The IC engine cylinder head has exhaust valve ports and intake valve ports for a number of cylinders. The intake and exhaust ports for each cylinder are circularly spaced in an array around a centre for that cylinder, there being two intake ports per cylinder, one port of the two for certain cylinders being a helical port and the other port of the two for the certain cylinders being a tangential port. The improvement comprises an air inlet and an air conveying passageway in the head beginning at the inlet and having two branches, one of the branches ending at one of the two intake ports for a first cylinder, the other branch ending at the first of the two intake ports for a second cylinder. The helical intake port for the first cylinder is located more than 135 degrees around the centre in a downstream direction from the tangential intake port for the first cylinder.</p> |
