| 摘要 |
A variable intake apparatus for an in-line four-cylinder internal combustion engine includes a rotary valve 3 provided between an intermediate portion along the length of four air intake passages 41 to 44 and an intake air collecting chamber 5, and a control means switching the rotary valve 3 in triple stages in response to the engine speed. The control means is constructed such that at a low speed range, communications are blocked off between the adjacent intake passageways 41 and 42, 42 and 43, 43 and 44, at an intermediate speed range, communications are established between pairs of intake passageways 41 and 44, 42 and 43, and at a high speed range, communications are established not only between the adjacent intake passages 41 and 42, 42 and 43, 43 and 44, but also between the respective air intake passageways 41 to 44 and the intake collecting chamber 5. <IMAGE>
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