| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary air supply device of a multi-cylinder internal combustion engine capable of disposing lead valve chambers in compact by effectively utilizing a proper dead space without increasing a size of the internal combustion engine.SOLUTION: Lead valve chambers (42C) accommodating lead valves (50) are integrally formed on exhaust-side side walls (4F) of cylinder heads (4) arranged in the cylinder arrangement direction in a state of projecting exhaust port opening end portions (23e) of exhaust ports (23) of cylinder heads (4) in a state of being arranged in parallel at an upper part of the arranged exhaust port opening end portions (23e), and the lead valve chamber (42C) corresponding to the outermost-side cylinder and the lead valve chamber (42C) corresponding to the inner-side cylinder adjacent to the outermost-side cylinder are disposed in adjacent to each other. |
