| 摘要 |
In an internal combustion engine, an exhaust pipe (13) is connected to an exhaust exit opening (12) of an exhaust manifold integrated type cylinder h ead (3), and a sensor (15) having a detecting portion (15a), which may be br oken by the adhesion of a moisture, is arranged in the exhaust entrance of t he exhaust pipe (13). The exhaust ports (9a and 9b) of a cylinder (#2) posit ioned at the center are so formed that the detecting portion (15a) of the se nsor (15) may not be contained in the extending cylindrical planes (Ya and Y b) of openings (Xa and Xb) into the exhaust gang portion (11) of the exhaust ports (9a and 9b) of the cylinder (#2).
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