| 摘要 |
PURPOSE: To provide an internal combustion engine capable of obtaining large output and torque and improved in fuel consumption and discharge of exhaust emission. CONSTITUTION: A multicylinder, four-stroke internal-combustion engine is spark- ignited and includes one intake valves 15, 16, 17 and one exhaust valve 18. These valves are cooperated with valve openings 25, 26, 27, 28 having valve opening centers 33, 34, 35, 36 in a combustion chamber 12. The valve opening centers are situated on both sides of a longitudinal center plane B-B of the internal combustion engine. The valve opening centers 33, 34 of the first intake valve 15 and the second intake valve 16 are situated on one side of the longitudinal center plane B-B, and the valve opening centers 35, 36 of the third intake valve 17 and the exhaust valve 18 are situated on the other side of the longitudinal center plane B-B.
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