Patent ID: 8281761

Claim:
An internal combustion engine, comprising: a plurality of cylinders each formed with a combustion chamber delimited between a piston and a cylinder head; an air intake system and a compressor for feeding combustion air into said combustion chamber; said air intake system including at least one distributor pipe, a plurality of intake pipes connected to said cylinders, and at least one plenum positioned between said distributor pipe and said intake pipes; a guiding duct communicating with said distributor pipe for feeding combustion air to said air intake system; wherein a charge pressure of the combustion air is reduced between an outlet out of said compressor and an inlet into said combustion chamber; wherein said air intake system having means for causing at least a portion of an air mass flows into said combustion chamber during an expansion phase of the air mass in the air intake system; and a maximum length of said distributor pipe is smaller than a length L 2 defined by the following formula: L 2 =7.2*10 6 /n N −1.5* L S ; where L S is a respective length of said intake pipe and n N is a nominal rotational speed of the internal combustion engine.