Induction systems for internal combustion engines.

摘要

An inducation system for a reciprocating internal combustion engine includes an air inlet, a first inlet duct (1) communicating with an inlet port of a cylinder of the engine, a second inlet duct (2) connected to the same inlet port in parallel with the first inlet duct, a supplementary duct (8) and valve means (6) which is movable between a first position in which the air inlet communicates directly with the first and second inlet ducts (1,2) and a second position in which the air inlet communicates only with the first inlet duct (1) via the supplementary duct (8) and not with the second inlet duct (2).