MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To dispense with a large change of an intake passage form by a change of an intake passage length or the like, to make a suction air amount reasonable in each cylinder, in a multi-cylinder internal combustion engine where a plurality of cylinders are arranged in parallel to conduct unequal interval ignition, a throttle valve common to each cylinder is interposed in an intermediate part, and at least a portion downstream of the throttle valve of the intake passage connected to a combustion chamber of each cylinder comprises a plurality of branched intake passages which are branched corresponding to the respective cylinders.SOLUTION: Cam profiles of intake side valve gear cams 97A, 98A, 97B, 98B are set to start the valve opening of an intake valve in the second cylinder C2 of the other cylinder before finishing an intake stroke of the first cylinder C1 advanced in the intake stroke out of cylinder pairs of minimizing an ignition interval, and to make a valve-opening time of an intake valve of the first cylinder C1 longer than a valve-opening time of the intake valve of the second cylinder C2.