Variable -length type air intake manifold

The utility model discloses a variable -length type air intake manifold, including the inlet manifold, connect at the steady voltage cavity of inlet manifold's one end and connect on the steady voltage cavity a plurality of minutes gas branch pipes side by side, be equipped with the gas hole that is used for supplying the gas to get into on the branch gas branch pipe, the pressure stabilizing cavity is internal to be equipped with long air flue, to lose heart and to be used for to switch long air flue and the air flue valve of losing heart, this air intake manifold is still including the control mechanism who is used for controlling the air flue threshold switch, the utility model discloses be suitable for dual -fuel engine to use, the pressure stabilizing cavity is internal to be equipped with the long air flue that can switch over each other and to lose heart, and through control mechanism control air flue threshold switch, when the engine slow -speed of revolution was turned round, the air current got into long pipeline, and it is steady to admit air to moment of torsion when improving the engine slow -speed of revolution makes whole car stronger when starting and climbing, when the high rotational speed of engine operateed, the air current got into the nozzle stub way, and the air input increases to power when improving the engine slow -speed of revolution makes whole car can reach the fastest speed in steady highway section.