Abstract: A fuel ignition device for an engine having a plurality of cylinders. The fuel ignition device including an active pre-chamber, the active pre-chamber further including a fuel inlet for introducing fuel into the active pre-chamber, a spark plug configured to ignite a fuel-air mixture in the active pre-chamber, and a plurality of holes arranged circumferentially around a lower end of the active pre-chamber, the plurality of holes being configured to provide fluid communication between the central chamber and a combustion main chamber of the gas engine.

Abstract: A spark ignition engine includes: a pre-chamber (PC); a main chamber (MC); and a cylinder head coupled with a water jacket. The PC includes: a spark plug; and a PC body. The spark plug is surrounded by a jacket with thermal-conductive substance. The thermal-conductive substance is solid at room temperature and liquid at working temperature of the PC. At working temperature of the PC, the liquid thermal-conductive substance conducts heat from the spark plug to the water jacket. The PC body is coated with a layer of non-thermal-conductive substance.

Abstract: An internal combustion engine with controlled ignition and direct ignition. In the internal combustion engine at least one intake duct can generate in a cylinder a flow referred to as “tumble”, at least for certain engine operating phases. Further, a fuel injector is implanted so as to emerge in the cylinder such that the fuel jet tends to be intercepted by the part of the flow circulating in the direction opposite to that of the jet which is directed towards the spark plug.