The utility model discloses a size changeable air intake
pipe, including the air intake manifold for connecting engine, the air
throttle valve for accurate control air intake and the pipeline main part for guiding and optimizing air intake
airflow, for guiding and optimizing air intake
airflow, air intake manifold and pipeline main part are connected respectively at air
throttle valve's both sides, and pipeline main part is by interface section, connecting section and horn mouth section at least three section
pipe body detachably connected composition, pipeline main part gradually increases along the direction of away from air
throttle valve its
pipe diameter. The utility model discloses size changeable air intake pipe, will air intake pipe design as multistage detachable modularization structure, need maintenance or refitting, and user only needs to simply unscrew each section pipe body, and the operation is extremely simple, and each section uses the
screw thread cooperation and connects, spares the independent clamp,
flange and multiple bolts, reduces the part quantity and material cost.