Because of the configuration and the reciprocating nature, the displacement volume of the HiPerTEC is twice the physical volume. Also of note is the distinct absence of cylinder heads in the HiPerTEC. The combustion pressure acts on two opposing piston faces, which eliminates the need for a large portion of the weight required to hold down heads in the traditional engine. The HiPerTEC has very low piston side thrust due to its configuration.  This drastically reduces the friction losses, heat load, and piston forces compared to a traditional design. Since the pistons
aren’t attached to any crank armature, the HiPerTEC has free-piston characteristics with a
variable compression ratio. 

This freedom, combined with independent valve control, allows the engine to operate in two- or four-stroke mode with the capability to switch between the two during normal engine operation. Another significant advantage is the dramatic lack of engine vibration. With its geometric configuration and light weight, simple design, the HiPerTEC is an ideal candidate for a variety of applications including unmanned air vehicles, RVs, micro-air-vehicles, ground combat vehicles, and portable or stationary power generation devices.