| 摘要 |
<p>The present invention relates to an internal combustion engine and more particularly to an improved high efficiency induction system for a multi-valve engine (11) which preferably is a five valve engine. According to the present invention at least one of the intake valves seats (16,17,18) is of a different diameter than the other two intake valve seats and that said intake valve seats (16,17,18) in conjunction with the intake port means (41,42,43) and the intake valves (19,21,22) are tuned such that each of the valve seats (16,17,18) provides an intake flow that has optimum powering efficiency at different engine speeds. <IMAGE></p> |
