fig1 compressed air conduit 50 generally includes a storage means and a cooling means so that a supply of temperature conditioned pressurized air may be available for use by combustion cylinder 70 in the embodiment shown in fig1 compressed air conduit 50 further includes an intake portion 52 an insulated reservoir 54 a heat rejecting portion 56 having heat rejecting fins 56 a a cool compressed air valve 60 an insulated hot air conduit 54 a hot compressed air valve 62 a pressure regulator 64 and an outlet portion 66 cool compressed air valve 60 and hot compressed air valve 62 can be adjusted in order to adjust the temperature of air in outlet portion 66 as will be described in more detail below pressure regulator 64 is for regulating the pressure of the pressurized air in outlet portion 66 preferably reservoir 54 should encompass a volume sufficient to provide a steady supply of compressed air for use by combustion cylinder 70 combustion cylinder 70 receives compressed air from compressed air conduit 50 as well as fuel which is mixed with the compressed air for combustion and expansion in a power stroke in the embodiment shown in fig1 combustion cylinder 70 is a two stroke cylinder having a piston which oscillates in a cycle including a power stroke in which the piston moves from a top dead center position to a bottom dead center position and a return.