Intake system for an internal combustion engine

摘要

An intake system for a multi-cylinder internal combustion engine, comprises an intake manifold 18 having a plenum chamber 20 common to a plurality of engine cylinders and an intake pipe 22 opening into the plenum chamber 20 to supply ambient air to the plenum chamber. An electric heater 26 is located within the plenum chamber 20 in the path of at least part of the air entering the plenum chamber from the intake pipe 22. <IMAGE>