An apparatus, system, and method are disclosed for improving engine development. The duct includes a rear section curved about a horizontal, transverse axis and a stuffer frame, that carries a reciprocable tine arrangement, is mounted for rotation about this axis. The second combustion chamber has an exit opening to allow product gas to exit from the second combustion chamber and into the first combustion chamber. Then, the voice access server automatically accesses the requested information, and audibly speaks the item to the caller. Other aspects of the invention provide a compression ignition engine for use in the method, and method of using the engine to combust fuels.