Ignition system for water-cooled gas engines

In a kit for converting an engine from water-cooled, diesel burning, compression ignition to water-cooled, gas burning spark ignition, said kit including a body located within a water jacket in said engine and having:

• an exterior configured to fit into an injector port in said engine;
• a first chamber for location adjacent to a combustion chamber in said engine and connected to said combustion chamber by a first orifice for admitting a fuel/air mixture in said combustion chamber into said first chamber;
• a second chamber for location adjacent to said first chamber and connected thereto by a second orifice smaller than said first orifice providing communication between said first and second chambers;
• fuel supply means connected to said body for supplying a fuel/air mixture to said second prechamber and for supplying a lean fuel/air mixture to said combustion chamber;
• and
• ignition means mounted in said body for igniting said mixture in said second chamber.