US Patent 10364738 Pre-chamber ignition system

Methods and systems are provided for a pre-chamber ignition system. In one example, a pre-chamber ignition system may include a pre-chamber extending into a combustion chamber, a piston protrusion shaped to fit through a bottom aperture of the pre-chamber, and a plurality of orifices formed by sidewall of the pre-chamber. A method for the pre-chamber ignition system includes adjusting spark timing within the pre-chamber and pressing the protrusion into the pre-chamber to ignite air/fuel within a main chamber.