| 摘要 |
<p>An inlet manifold 7 for both banks of cylinders of a V-configuration internal combustion engine has two different lengths of tuned inlet passage between a plenum 14 and an inlet valve 3. A first length extends from an opening 13a in one face (in this case the upper) of the plenum 14. A second length extends the first length when valve 13 closes the opening 13a, passes along passage 16 around the side of the plenum remote from the cylinder 2, and communicates with the other face (in this case the lower) via an opening 18. It is possible to construct such a manifold in three parts: a plastics moulding 10 defining the plenum 14; two metal pressings 8, 9 which engage each other; and a third metal pressing 11. Such a construction can be cheaper and lighter than hitherto.</p> |
