Passive Pre-Chamber Ignition with Varying Nozzle Sizes for Internal Combustion Engine

A method of manufacturing an ignition pre-chamber for an internal combustion engine, the engine having cylinders each with a spark plug with an electrode end and a combustion chamber, comprising:

• modeling a pre-chamber having a housing that encloses a volume between the electrode end of the spark plug and the combustion chamber;
• a bottom wall of the pre-chamber housing having a number of nozzles that provide flow between the pre-chamber housing and the combustion chamber;
• using computational fluid dynamics modeling to evaluate the pre-chamber with nozzles having varying nozzle diameters;
• and
• selecting nozzle diameters based on the step of using computational fluid dynamics modeling.

A method of operating an internal combustion engine, the engine having cylinders each with a spark plug with an electrode end and a combustion chamber, comprising:

• placing a pre-chamber housing at the electrode end of the spark plug, such that the pre-chamber encloses a volume between the electrode end of the spark plug and the combustion chamber;
• wherein the bottom wall of the pre-chamber housing has a number of nozzles that provide flow between the pre-chamber housing and the combustion chamber;
• and
• sizing the diameter of the nozzles to have varying diameters based on computational fluid dynamics modeling of residual gasses in the pre-chamber during activation of the spark plug.