referring to fig5 which is a schematic representation of the intercooler core 306 which includes radial rib 110 as well as axial ribs 350 in most other aspects intercooler core 306 is similar to intercooler core 106 however eliminating the need for an external drive system including the drive sprockets and or the drive pulleys as depicted in fig2 and 3 fig5 depicts flow of cooling fluid 151 as fluid flow 150 which normally is a liquid which is cooling intercooler core 306 as it is being heated by the air 137 flowing over ribs 110 and 350 on outer surface 111 intercooler core 306 normally includes a baffle 148 as does intercooler core 106 as well as intercooler core 206 most of the cooling fluid 151 is directed through the axially extending channels 118 which are oriented around the outer periphery of axial chamber 117 of the outer wall 120 of intercooler core 306 the intercooler cores 106 206 and 306 normally would include bearings 114 at each end to support the intercooler core as well as seals 150 to seal out the cooling fluid 151 from the outer surface 111 of the intercooler core oriented in a transverse direction to fluid flow 150 is airflow 136 which flows around the outer surface 111 of intercooler core 306 due to its positioning within intercooler housing 104 the intercooler housings 104 include air passageways 134 and air inlets 132 and or air inlets 332.