Parallel prechamber ignition system

A method of igniting an air/fuel mixture in an internal combustion engine, the method comprising:

• receiving the air/fuel mixture as an incoming air/fuel mixture flow from a main combustion chamber of the internal combustion engine into an enclosure adjacent the main combustion chamber, the enclosure defining a first chamber enclosing first and second ignition bodies and the enclosure defining a second chamber adjacent the first chamber and connected to the first chamber via a first passage, where the enclosure defines the first chamber as comprising a first inner chamber and a first outer chamber connected by a second passage, and where the first inner chamber encloses the first and second ignition bodies;
• directing a portion of the air/fuel mixture received in the enclosure toward an ignition gap between the first and second ignition bodies and another portion into the second chamber;
• igniting the air/fuel mixture in the ignition gap;
• and
• ejecting flame from combustion in the first chamber into the main combustion chamber;
• and then
• ejecting flame from combustion in the second chamber into the main combustion chamber.