Internal combustion engine

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;
• wherein a minimum length of said distributor pipe is greater than a length L1 defined by the following formula:
• L1=200− 4/3*LS+1.7*nN−2.22*(DV−30);
• where LS is a respective length of said intake pipe, nN is a nominal rotational speed of the internal combustion engine, and DV is an equivalent distributor pipe diameter;
• a guiding duct communicating with said distributor pipe for feeding combustion air to said air intake system;
• and
• wherein due to dimensioning of said distributor pipe and said intake pipe a charge pressure of the combustion air is reduced between an outlet out of said compressor and an inlet into said combustion chamber and 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.

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;
• wherein a length of said distributor pipe (LV) is greater than a length L1 defined by a first formula:
• L1=200− 4/3*LS+1.7*nN−2.22* (DV30);
• the length of said distributor pipe is smaller that a length L2 defined by a second formula:
• L2=7.2*106/nN−1.5*LS;
• where LS is a respective length of said intake pipe, nN is a nominal rotational speed of the internal combustion engine, and DV is an equivalent distributor pipe diameter;
• a guiding duct communicating with said distributor pipe for feeding combustion air to said air intake system;
• and
• wherein due to dimensioning of said distributor pipe and said intake pipe a charge pressure of the combustion air is reduced between an outlet out of said compressor and an inlet into said combustion chamber and 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.

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;
• wherein a length of said distributor pipe is greater than a length L3 defined by the formula:
• L3=34*DV−650* 4/3LS;
• the length of said distributor pipe is smaller than a length L2 defined by the formula:
• L2=7.2*106/nN−1.5*LS;
• where Ls is a respective length of said intake pipe, nN is a nominal rotational speed of the internal combustion engine, and DV is an equivalent distributor pipe diameter;
• a guiding duct communicating with said distributor pipe for feeding combustion air to said air intake system;
• and
• wherein due to dimensioning of said distributor pipe and said intake pipe a charge pressure of the combustion air is reduced between an outlet out of said compressor and an inlet into said combustion chamber and 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.