The latest advancements in common rail fuel injection system, material science, engine control strategies, and manufacturing technologies have challenged and allowed engine designers to create a high power density, fuel efficient, reliable, and environmental friendly multi-fuel engine. To increase power density a novel high-speed 2-stroke turbocharged compression ignition engine will feed the pressurized air directly into the combustion chamber without going through the crankcase. Thus, only pressurized clean air will be used for combustion and oil consumption will be dramatically reduced. To further improve volumetric efficiency and reduce emissions, a computer controlled dynamic variable valve timing system can be incorporated such that the optimum amount of pressurized air will be available for combustion at various loads and conditions. Combustion efficiency at different loads can be optimized by adjusting the compression ratio dynamically through computer control. By controlling the fuel injection strategies through advanced engine calibration one can optimize engine horsepower, fuel economy, and emissions with multiple fuels. Parasitic losses can be minimized by reducing friction and pumping losses. Lightweight metal alloys and composite materials that have been well proven in the motorsports and aerospace industries can be used to replace a variety of engine components that are currently made of steel, iron, and aluminum to reduce the weight-to-power ratio to be close to 1. The result is a versatile, lightweight, high power density, reliable, fuel efficient, and “green” multifuel engine that will enable soldiers to move faster, go farther, have maximum fuel flexibility, and be safer in the battle field and other operating conditions.