| 摘要 |
<p>An intake system for an internal combustion engine comprises an intake tube (5) for supply of air and a plenum chamber (8) in communication with said intake. At least one primary tube (11) communicates between the plenum chamber (8) and a respective cylinder of the engine. At least part of the or each primary tube (11) and at least part of said intake (5) are constituted by passageways (10,6) defined between cylinder and a barrel relatively rotatable therewithin. Relative rotation between cylinder and barrel in one sense causes the length of all said passageways progressively to decrease, while relative rotation in an opposite sense causes the length of said passageways progressively to increase. Hence the system can operate at optimum efficiency at different engine speeds.</p> |
