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An engine operable using flash steam expansion comprising one or more cylinders each having a piston and one or more water injection ports, the pistons driven by flash steam expansion when injected water rapidly change state from liquid to gas. Another engine operable in an internal combustion mode

An engine operable using flash steam expansion comprising one or more cylinders each having a piston and one or more water injection ports, the pistons driven by flash steam expansion when injected water rapidly change state from liquid to gas. Another engine operable in an internal combustion mode and a flash steam expansion mode comprising one or more cylinders having a piston, an air intake port and valve, and first and second exhaust ports and valves, first, second, and third cam shafts, wherein the engine is selectably operable in a four-cycle mode or a two-cycle mode. A method of operating an engine in a four-cycle internal combustion mode and a two-cycle flash steam expansion mode comprising the steps of using internal combustion in a four-cycle sequence, detecting when a temperature of the engine reaches a predetermined temperature; and terminating internal combustion and using flash steam expansion in a two-cycle sequence.

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1. An engine operable in an internal combustion mode and a flash steam expansion mode, the engine comprising: one or more cylinders, each cylinder comprising: a piston;an air intake port having an intake valve; andfirst and second exhaust ports having first and second exhaust valves, respectively;a

1. An engine operable in an internal combustion mode and a flash steam expansion mode, the engine comprising: one or more cylinders, each cylinder comprising: a piston;an air intake port having an intake valve; andfirst and second exhaust ports having first and second exhaust valves, respectively;a first cam shaft to operate the first exhaust valve on each cylinder;a second cam shaft to operate the second exhaust valve on each cylinder; anda third cam shaft to operate the intake valve on each cylinder;wherein the engine is selectably operable in a four-cycle mode or a two-cycle mode; and wherein in the two-cycle mode, for a given cylinder, the intake valve is configured to close by disabling the third cam shaft, the first cam shaft is configured to open and close the first exhaust valve once every four strokes of the engine, and the second cam shaft is configured to open and close the second exhaust valve once every four strokes of the engine, the opening and closing of the second exhaust valve configured to occur 180 degrees out of phase with the opening and closing of the first exhaust valve. 2. The engine of claim 1 wherein the one or more cylinders are arranged in a linear configuration, and further comprising a single piston rod extending through and beyond each cylinder and to which each piston is rigidly coupled. 3. The engine of claim 1 wherein the engine is operable using internal combustion or a combination of internal combustion and flash steam expansion in the four-cycle mode. 4. The engine of claim 1 wherein the engine is operable using flash steam expansion in the two-cycle mode. 5. The engine of claim 1 wherein in the four-cycle mode, for a given cylinder, the second exhaust valve is configured to close by disabling the second cam shaft, the third cam shaft is configured to open and close the intake valve once every four strokes of the engine, and the first cam shaft is configured to open and close the first exhaust valve once every four strokes of the engine, the opening and closing of the first exhaust valve occurring 270 degrees out of phase with the opening and closing of the intake valve. 6. The engine of claim 1 wherein one or more of the cylinders comprises a fuel ignition mechanism. 7. The engine of claim 1 wherein the engine is configured to ignite a mixture of fuel and air within the one or more cylinders and, subsequently within the same power stroke, inject water through the water injection ports into the one or more cylinders. 8. The engine of claim 7 wherein the injected water is heated to a superheated state prior to injection. 9. The engine of claim 1 further comprising: a single piston rod extending through and beyond each cylinder and to which each piston is rigidly coupled; anda crankshaft coupled to a first end of the piston rod. 10. The engine of claim 9 wherein the crankshaft is rotatably driven by a motor. 11. The engine of claim 9 further comprising: a single piston rod extending through and beyond each cylinder and to which each piston is rigidly coupled; anda momentum device coupled with the piston rod. 12. The engine of claim 9 further comprising: a single piston rod extending through and beyond each cylinder and to which each piston is rigidly coupled; anda power takeoff device coupled with a second end of the piston rod. 13. The engine of claim 12, wherein the power takeoff device comprises at least one of a double over running clutch gearbox. 14. The engine of claim 12, wherein the power takeoff device comprises a linear generator. 15. The engine of claim 12, wherein the power takeoff device comprises a reciprocating hydraulic pump. 16. The engine of claim 1, further comprising: one or more exhaust manifolds coupled with at least one of the first exhaust port or the second exhaust port; anda water source in fluid connection with one or more of water injection ports and in thermal connection with one or more of the exhaust manifolds to transfer heat from one or more exhaust manifolds to the water source. 17. The engine of claim 1 further comprising an independent heat source configured to heat water prior to injection into the one or more cylinders. 18. A method of operating an engine operable in a four-cycle internal combustion mode and a two-cycle flash steam expansion mode, the method comprising: using internal combustion to drive one or more pistons in a given cylinder in a four-cycle sequence, wherein using internal combustion to drive one or more pistons in a given cylinder in a four-cycle sequence comprises: opening and closing an intake port of the given cylinder at a first interval; andopening and closing an exhaust port of the given cylinder at a second interval, wherein the second interval is 270 degrees out of phase with the first interval;detecting when a temperature of the engine reaches a predetermined temperature; andterminating internal combustion and using flash steam expansion to drive the one or more pistons in a given cylinder in a two-cycle sequence, when the detected temperature of the engine reaches the predetermined temperature. 19. The method of claim 18, wherein terminating internal combustion and using flash steam expansion to drive the one or more pistons in a two-cycle sequence comprises: ceasing the intake of air into the given cylinder;opening and closing a first set of exhaust ports of the given cylinder at a third interval; andopening and closing a second set of exhaust ports of the given cylinder at a fourth interval, wherein the third interval is 180 degrees out of phase with the fourth interval. 20. The method of claim 18, further comprising using a combination of internal combustion and flash steam expansion to drive the one or more pistons in a given cylinder in the four-cycle sequence when the detected temperature of the engine reaches the predetermined temperature. 21. The method of claim 20, wherein using a combination of internal combustion and flash steam to drive the one or more pistons in a given cylinder in the four-cycle sequence comprises: supplying a fuel-air mixture into a given cylinder during an intake stroke of the four-cycle sequence, wherein the fuel-air mixture comprises a suitable stoichiometric ratio of fuel and air;igniting the fuel-air mixture during a power stroke of the four-cycle sequence, the resulting combustion partially driving the piston away through the power stroke; andwhen the piston is partially through the power stroke, supplying water into the given cylinder. 22. A method of operating an engine operable in a four-cycle internal combustion mode and a two-cycle flash steam expansion mode, the method comprising the steps of: using internal combustion to drive one or more pistons in a given cylinder in a four-cycle sequence;detecting when a temperature of the engine reaches a predetermined temperature; andterminating internal combustion and using flash steam expansion to drive the one or more pistons in a given cylinder in a two-cycle sequence when the detected temperature of the engine reaches the predetermined temperature; andusing a combination of internal combustion and flash steam expansion to drive the one or more pistons in a given cylinder in the four-cycle sequence when the detected temperature of the engine reaches the predetermined temperature. 23. The method of claim 22, wherein using internal combustion to drive one or more pistons in a four-cycle sequence comprises: opening and closing an intake port of the given cylinder at a first interval; andopening and closing an exhaust port of the given cylinder at a second interval;wherein the second interval is 270 degrees out of phase with the first interval. 24. The method of claim 22, wherein terminating internal combustion and using flash steam expansion to drive the one or more pistons in a two-cycle sequence comprises: ceasing the intake of air into the given cylinder;opening and closing a first set of exhaust ports of the given cylinder at a first interval; andopening and closing a second set of exhaust ports of the given cylinder at a second interval, wherein the second interval is 180 degrees out of phase with the first interval. 25. The method of claim 22, wherein using a combination of internal combustion and flash steam to drive the one or more pistons in a given cylinder in the four-cycle sequence comprises: supplying a fuel-air mixture into a given cylinder during an intake stroke of the four-cycle sequence, wherein the fuel-air mixture comprises a suitable stoichiometric ratio of fuel and air;igniting the fuel-air mixture during a power stroke of the four-cycle sequence, the resulting combustion partially driving the piston away through the power stroke; andwhen the piston is partially through the power stroke, supplying water into the given cylinder.