Of the various pathways to the hydrogen economy, the conversion of internal combustion engines to burn hydrogen is one nearer term solution. While hydrogen engine conversions have been around for a long time, initially these utilized port injection. This approach results in fuel injected prior to or just after the intake valve has opened. Injection of gaseous fuels through the intake port(s) leads to a variety of complications including a reduction of power output due to drastic measures needed to control emissions levels. The item of interest for this paper is improvement over traditional means of controlling emissions. Traditional means of controlling emissions is to run the engine at an equivalence ratio greater than one and typically recirculation of the exhaust gasses. The motivation for this lean operation is typically an improvement of emissions output by controlling one of the determining factors involved in the production of NOx. An obvious result of an equivalence ratio much greater than one is an appreciable reduction in power output as compared to stoichiometric operation. This reduction in power output is especially pronounced in smaller displacement engines with relatively low power output. In these instances this reduction in power may make conversion to hydrogen fuel impractical. In-cylinder injection of an internal combustion engine provides a reliable method for delivering gaseous hydrogen fuel whereby power output, volumetric efficiency, and emissions levels are improved over port injection. Modifying an engine to operate on hydrogen, by means of direct injection, implies that the fuel delivery system be capable of delivering fuel directly into the combustion chamber regardless of crank and valve positions. In this paper it is shown that when the fueling and ignition systems are properly tuned, traditional means of lowering emissions, that is to say running an engine at equivalence ratios greater than one or implementing exhaust gas recirculation, are not an effective solution to lowering emissions while maintaining the highest possible power output. Reported here is the work with the development and testing of an in-cylinder injection system. Effects on power output and emissions are included.