Abstract: Apparatus and method for modifying existing internal combustion engines that fail to meet current air quality standards so as to bring such engines into compliance. The invention includes the provision of an injection valve assembly for the engine's cylinders that promotes mixing of injected fuel with air present in the cylinder by establishing a cyclonic jetting action in the fuel upon its introduction into the cylinder. The assembly includes a piston and cartridge that are configured for reciprocating engagement, one with the other. The cartridge has channels that impart a rotational spin on pressured gas as it is directed out of the assembly. At least two fuel distribution patterns are created; one that is focused, much like a beam and another that is flared into a conical pattern.

Abstract: A clean burning pre-combustion chamber system and method for modifying existing "dirty" natural gas engines to meet modem exhaust emissions standards includes a number of small, water-cooled pre-combustion chambers which can be threaded into the existing spark plug holes, of which there are two per cylinder. A specially shaped ignition chamber within each pre-combustion chamber enhances fuel flow and virtually eliminates the "knocking" which is typically found in pre-combustion chamber modified engines. The inventive system allows existing engines to be economically converted with minimal or no structural changes to the cylinders, heads or valve covers.